com.trolltech.qt.core
Class QByteArray

java.lang.Object
  extended by com.trolltech.qt.internal.QSignalEmitterInternal
      extended by com.trolltech.qt.QSignalEmitter
          extended by com.trolltech.qt.QtJambiObject
              extended by com.trolltech.qt.core.QByteArray
All Implemented Interfaces:
QtJambiInterface, java.lang.Cloneable, java.lang.Comparable

public class QByteArray
extends QtJambiObject
implements java.lang.Comparable, java.lang.Cloneable

The QByteArray class provides an array of bytes. QByteArray can be used to store both raw bytes (including '\0's) and traditional 8-bit '\0'-terminated strings. Using QByteArray is much more convenient than using const char *. Behind the scenes, it always ensures that the data is followed by a '\0' terminator, and uses implicit sharing (copy-on-write) to reduce memory usage and avoid needless copying of data.

In addition to QByteArray, Qt also provides the QString class to store string data. For most purposes, QString is the class you want to use. It stores 16-bit Unicode characters, making it easy to store non-ASCII/non-Latin-1 characters in your application. Furthermore, QString is used throughout in the Qt API. The two main cases where QByteArray is appropriate are when you need to store raw binary data, and when memory conservation is critical (e.g., with Qt for Embedded Linux).

One way to initialize a QByteArray is simply to pass a const char * to its constructor. For example, the following code creates a byte array of size 5 containing the data "Hello":

        QByteArray ba = new QByteArray("Hello");
Although the size() is 5, the byte array also maintains an extra '\0' character at the end so that if a function is used that asks for a pointer to the underlying data (e.g. a call to data()), the data pointed to is guaranteed to be '\0'-terminated.

QByteArray makes a deep copy of the const char * data, so you can modify it later without experiencing side effects. (If for performance reasons you don't want to take a deep copy of the character data, use QByteArray::fromRawData() instead.)

Another approach is to set the size of the array using resize() and to initialize the data byte per byte. QByteArray uses 0-based indexes, just like C++ arrays. To access the byte at a particular index position, you can use operator[](). On non-const byte arrays, operator[]() returns a reference to a byte that can be used on the left side of an assignment. For example:

        QByteArray ba;
        ba.resize(5);
        ba[0] = 0x3c;
        ba[1] = 0xb8;
        ba[2] = 0x64;
        ba[3] = 0x18;
        ba[4] = 0xca;
For read-only access, an alternative syntax is to use at():
        for (int i = 0; i < ba.size(); ++i) {
            if (ba.at(i) >= 'a' && ba.at(i) <= 'f')
                System.out.println("Found character in range [a-f]");
        }
at() can be faster than operator[](), because it never causes a deep copy to occur.

To extract many bytes at a time, use left(), right(), or mid().

A QByteArray can embed '\0' bytes. The size() function always returns the size of the whole array, including embedded '\0' bytes. If you want to obtain the length of the data up to and excluding the first '\0' character, call qstrlen() on the byte array.

After a call to resize(), newly allocated bytes have undefined values. To set all the bytes to a particular value, call fill().

To obtain a pointer to the actual character data, call data() or constData(). These functions return a pointer to the beginning of the data. The pointer is guaranteed to remain valid until a non-const function is called on the QByteArray. It is also guaranteed that the data ends with a '\0' byte. This '\0' byte is automatically provided by QByteArray and is not counted in size().

QByteArray provides the following basic functions for modifying the byte data: append(), prepend(), insert(), replace(), and remove(). For example:

        QByteArray x = new QByteArray("and");
        x.prepend("rock ");         // x == "rock and"
        x.append(" roll");          // x == "rock and roll"
        x.replace(5, 3, new QByteArray("&"));       // x == "rock & roll"
The replace() and remove() functions' first two arguments are the position from which to start erasing and the number of bytes that should be erased.

When you append() data to a non-empty array, the array will be reallocated and the new data copied to it. You can avoid this behavior by calling reserve(), which preallocates a certain amount of memory. You can also call capacity() to find out how much memory QByteArray actually allocated. Data appended to an empty array is not copied.

A frequent requirement is to remove whitespace characters from a byte array ('\n', '\t', ' ', etc.). If you want to remove whitespace from both ends of a QByteArray, use trimmed(). If you want to remove whitespace from both ends and replace multiple consecutive whitespaces with a single space character within the byte array, use simplified().

If you want to find all occurrences of a particular character or substring in a QByteArray, use indexOf() or lastIndexOf(). The former searches forward starting from a given index position, the latter searches backward. Both return the index position of the character or substring if they find it; otherwise, they return -1. For example, here's a typical loop that finds all occurrences of a particular substring:

        QByteArray ba = new QByteArray("We must be <b>bold</b>, very <b>bold</b>");
        int j = 0;
        while ((j = ba.indexOf("<b>", j)) != -1) {
            System.out.println("Found <b> tag at index position " + j);
            ++j;
        }
If you simply want to check whether a QByteArray contains a particular character or substring, use contains(). If you want to find out how many times a particular character or substring occurs in the byte array, use count(). If you want to replace all occurrences of a particular value with another, use one of the two-parameter replace() overloads.

QByteArrays can be compared using overloaded operators such as operator<(), operator<=(), operator==(), operator>=(), and so on. The comparison is based exclusively on the numeric values of the characters and is very fast, but is not what a human would expect. QString::localeAwareCompare() is a better choice for sorting user-interface strings.

For historical reasons, QByteArray distinguishes between a null byte array and an empty byte array. A null byte array is a byte array that is initialized using QByteArray's default constructor or by passing (const char *)0 to the constructor. An empty byte array is any byte array with size 0. A null byte array is always empty, but an empty byte array isn't necessarily null:

        new QByteArray().isNull();          // returns true
        new QByteArray().isEmpty();         // returns true

        new QByteArray("").isNull();        // returns false
        new QByteArray("").isEmpty();       // returns true

        new QByteArray("abc").isNull();     // returns false
        new QByteArray("abc").isEmpty();    // returns false
All functions except isNull() treat null byte arrays the same as empty byte arrays. For example, data() returns a pointer to a '\0' character for a null byte array (not a null pointer), and QByteArray() compares equal to QByteArray(""). We recommend that you always use isEmpty() and avoid isNull().

Notes on Locale

Number-String Conversions

Functions that perform conversions between numeric data types and strings are performed in the C locale, irrespective of the user's locale settings. Use QString to perform locale-aware conversions between numbers and strings.

8-bit Character Comparisons

In QByteArray, the notion of uppercase and lowercase and of which character is greater than or less than another character is locale dependent. This affects functions that support a case insensitive option or that compare or lowercase or uppercase their arguments. Case insensitive operations and comparisons will be accurate if both strings contain only ASCII characters. (If $LC_CTYPE is set, most Unix systems do "the right thing".) Functions that this affects include
contains(), indexOf(), lastIndexOf(), operator<(), operator<=(), operator>(), operator>=(), toLower() and toUpper().

This issue does not apply to QStrings since they represent characters using Unicode.

See also:
QString, and QBitArray.


Nested Class Summary
 
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9
 
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal
 
Field Summary
 
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
currentSender
 
Constructor Summary
QByteArray()
           
QByteArray(byte[] data)
          Constructs a byte array containing the bytes of array data.
QByteArray(int size, byte c)
          Constructs a byte array of size size with every byte set to character ch.
QByteArray(QByteArray arg__1)
          Constructs a copy of other.
QByteArray(java.lang.String s)
          Constructs a byte array initialized with the string str.
 
Method Summary
 QByteArray append(byte other)
          This function appends other to the end of this QByteArray.
 QByteArray append(QByteArray other)
          This function appends the contents of other to the end of this QByteArray.
 QByteArray append(java.lang.String other)
          This function appends the contents of other to the end of this QByteArray.
 byte at(int i)
          Returns the character at index position i in the byte array.
 int capacity()
          Returns the maximum number of bytes that can be stored in the byte array without forcing a reallocation.
 void chop(int n)
          Removes n bytes from the end of the byte array.
 void clear()
          Clears the contents of the byte array and makes it empty.
 QByteArray clone()
          This method is reimplemented for internal reasons
 boolean contains(byte c)
          This is an overloaded member function, provided for convenience.
 boolean contains(QByteArray a)
          Returns true if the byte array contains an occurrence of the byte array ba; otherwise returns false.
 boolean contains(java.lang.String str)
          Returns true there is at least one occurrence of str in this QByteArray.
 int count(byte c)
          This is an overloaded member function, provided for convenience.
 int count(QByteArray a)
          Returns the number of (potentially overlapping) occurrences of byte array ba in this byte array.
 int count(java.lang.String str)
          Returns the number of occurrences of str in this QByteArray.
 QNativePointer data()
          Returns a pointer to the data stored in the byte array.
 boolean endsWith(byte c)
          This is an overloaded member function, provided for convenience.
 boolean endsWith(QByteArray a)
          Returns true if this byte array ends with byte array ba; otherwise returns false.
 boolean endsWith(java.lang.String str)
          Returns true if this QByteArray ends with str; otherwise, returns false.
 QByteArray fill(byte b)
          Sets every byte in the byte array to character b.
 QByteArray fill(byte b, int size)
          Sets every byte in the byte array to character b.
static QByteArray fromBase64(QByteArray base64)
          Returns a decoded copy of the Base64 array base64.
static QByteArray fromHex(QByteArray hexEncoded)
          Returns a decoded copy of the hex encoded array hexEncoded.
static QByteArray fromPercentEncoding(QByteArray pctEncoded)
          Returns a decoded copy of the URI/URL-style percent-encoded input.
static QByteArray fromPercentEncoding(QByteArray pctEncoded, byte percent)
          Returns a decoded copy of the URI/URL-style percent-encoded input.
 int indexOf(byte c)
          This is an overloaded member function, provided for convenience.
 int indexOf(byte c, int from)
          This is an overloaded member function, provided for convenience.
 int indexOf(QByteArray a)
          Returns the index position of the first occurrence of the byte array ba in this byte array, searching forward from index position from.
 int indexOf(QByteArray a, int from)
          Returns the index position of the first occurrence of the byte array ba in this byte array, searching forward from index position from.
 int indexOf(java.lang.String s)
          This is an overloaded member function, provided for convenience.
 int indexOf(java.lang.String s, int from)
          This is an overloaded member function, provided for convenience.
 QByteArray insert(int i, byte b)
          Inserts byte b at index position i in the byte array.
 QByteArray insert(int i, QByteArray ba)
          Inserts the byte array ba at index position i and returns a reference to this byte array.
 QByteArray insert(int i, java.lang.String str)
          Inserts String str at index position i in the byte array.
 boolean isEmpty()
          Returns true if the byte array has size 0; otherwise returns false.
 boolean isNull()
          Returns true if this byte array is null; otherwise returns false.
 int lastIndexOf(byte c)
          This is an overloaded member function, provided for convenience.
 int lastIndexOf(byte c, int from)
          This is an overloaded member function, provided for convenience.
 int lastIndexOf(QByteArray a)
          Returns the index position of the last occurrence of the byte array ba in this byte array, searching backward from index position from.
 int lastIndexOf(QByteArray a, int from)
          Returns the index position of the last occurrence of the byte array ba in this byte array, searching backward from index position from.
 int lastIndexOf(java.lang.String s)
          This is an overloaded member function, provided for convenience.
 int lastIndexOf(java.lang.String s, int from)
          This is an overloaded member function, provided for convenience.
 QByteArray left(int len)
          Returns a byte array that contains the leftmost len bytes of this byte array.
 QByteArray leftJustified(int width)
          Returns a byte array of size width that contains this byte array padded by the fill character.
 QByteArray leftJustified(int width, byte fill)
          Returns a byte array of size width that contains this byte array padded by the fill character.
 QByteArray leftJustified(int width, byte fill, boolean truncate)
          Returns a byte array of size width that contains this byte array padded by the fill character.
 int length()
          Same as size().
 QByteArray mid(int index)
          Returns a byte array containing len bytes from this byte array, starting at position pos.
 QByteArray mid(int index, int len)
          Returns a byte array containing len bytes from this byte array, starting at position pos.
static QByteArray number(double arg__1)
          This is an overloaded member function, provided for convenience.
static QByteArray number(double arg__1, byte f)
          This is an overloaded member function, provided for convenience.
static QByteArray number(double arg__1, byte f, int prec)
          This is an overloaded member function, provided for convenience.
static QByteArray number(int arg__1)
          Returns a byte array containing the string equivalent of the number n to base base (10 by default).
static QByteArray number(int arg__1, int base)
          Returns a byte array containing the string equivalent of the number n to base base (10 by default).
static QByteArray number(long arg__1)
          This is an overloaded member function, provided for convenience.
static QByteArray number(long arg__1, int base)
          Returns a byte array containing the string equivalent of the number arg__1 to base base.
 QByteArray prepend(byte other)
          Prepends other to this QByteArray, and returns the resulting array.
 QByteArray prepend(QByteArray other)
          Prepends other to this QByteArray, and returns the resulting array.
 QByteArray prepend(java.lang.String str)
          Prepends str to this QByteArray, and returns the resulting array.
 void readFrom(QDataStream arg__1)
          Reads a QByteArray
 QByteArray remove(int pos, int len)
          Removes len bytes from the array, starting at index position pos, and returns a reference to the array.
 QByteArray repeated(int times)
          Returns a copy of this byte array repeated the specified number of times.
 QByteArray replace(byte before, byte after)
          Replaces every occurrence of before with after.
 QByteArray replace(byte before, QByteArray after)
          Replaces every occurrence of before with after.
 QByteArray replace(byte before, java.lang.String after)
          Replaces every occurrence of before with after.
 QByteArray replace(int pos, int len, QByteArray after)
          Replaces every occurrence of before with after.
 QByteArray replace(QByteArray before, QByteArray after)
          Replaces every occurrence of before with after.
 QByteArray replace(QByteArray before, java.lang.String after)
          Replaces every occurrence of the byte array before with the string after.
 QByteArray replace(java.lang.String before, QByteArray after)
          Replaces every occurrence of before with after.
 QByteArray replace(java.lang.String before, java.lang.String after)
          Replaces every occurrence of before with after.
 void reserve(int size)
          Attempts to allocate memory for at least size bytes.
 void resize(int size)
          Sets the size of the byte array to size bytes.
 QByteArray right(int len)
          Returns a byte array that contains the rightmost len bytes of this byte array.
 QByteArray rightJustified(int width)
          Returns a byte array of size width that contains the fill character followed by this byte array.
 QByteArray rightJustified(int width, byte fill)
          Returns a byte array of size width that contains the fill character followed by this byte array.
 QByteArray rightJustified(int width, byte fill, boolean truncate)
          Returns a byte array of size width that contains the fill character followed by this byte array.
 QByteArray set(QByteArray other)
          This function sets the contents of this QByteArray equal to other.
 QByteArray setNum(char n)
          See also.
toUShort().
 QByteArray setNum(char n, int base)
          See also.
toShort().
 QByteArray setNum(double n)
          This is an overloaded function provided for convenience.
 QByteArray setNum(double n, char f)
          This is an overloaded function provided for convenience.
 QByteArray setNum(double n, char f, int prec)
          Sets the byte array to the printed value of n, formatted in format f with precision prec, and returns a reference to the byte array.
 QByteArray setNum(float n)
          Sets the byte array to the printed value of n, formatted in format f with precision 6, and returns a reference to the byte array.
 QByteArray setNum(float n, char f)
          Sets the byte array to the printed value of n, formatted in format f with precision 6, and returns a reference to the byte array.
 QByteArray setNum(float n, char f, int prec)
          Sets the byte array to the printed value of n, formatted in format f with precision prec, and returns a reference to the byte array.
 QByteArray setNum(int n)
          Sets the array to the printed value of n
 QByteArray setNum(int n, int base)
          Sets the array to the printed value of n using base as base.
 QByteArray setNum(long n)
          This is an overloaded function provided for convenience.
 QByteArray setNum(long n, int base)
          This is an overloaded function provided for convenience.
 QByteArray setNum(short n)
          This is an overloaded function provided for convenience.
 QByteArray setNum(short n, int base)
          This is an overloaded function provided for convenience.
 QByteArray simplified()
          Returns a byte array that has whitespace removed from the start and the end, and which has each sequence of internal whitespace replaced with a single space.
 int size()
          Returns the number of bytes in this byte array.
 java.util.List split(byte sep)
          Splits the byte array into subarrays wherever sep occurs, and returns the list of those arrays.
 void squeeze()
          Releases any memory not required to store the array's data.
 boolean startsWith(byte c)
          This is an overloaded member function, provided for convenience.
 boolean startsWith(QByteArray a)
          Returns true if this byte array starts with byte array ba; otherwise returns false.
 boolean startsWith(java.lang.String str)
          Returns true if this byte array starts with string str; otherwise returns false.
 QByteArray toBase64()
          Returns a copy of the byte array, encoded as Base64.
 byte[] toByteArray()
          Returns the contents of this QByteArray.
 char toChar()
          Returns the byte array converted to a char.
 char toChar(int base)
          Returns the byte array converted to an char using base base, which is 10 by default and must be between 2 and 36, or 0.
 double toDouble()
          Returns the byte array converted to an double.
 float toFloat()
          Returns the byte array converted to an float.
 QByteArray toHex()
          Returns a hex encoded copy of the byte array.
 int toInt()
          Returns the byte array converted to an int using base 10.
 int toInt(int base)
          Returns the byte array converted to an int using base base, which is 10 by default and must be between 2 and 36, or 0.
 QByteArray toLower()
          Returns a lowercase copy of the byte array.
 QByteArray toPercentEncoding()
          Returns a URI/URL-style percent-encoded copy of this byte array.
 QByteArray toPercentEncoding(QByteArray exclude)
          Returns a URI/URL-style percent-encoded copy of this byte array.
 QByteArray toPercentEncoding(QByteArray exclude, QByteArray include)
          Returns a URI/URL-style percent-encoded copy of this byte array.
 QByteArray toPercentEncoding(QByteArray exclude, QByteArray include, byte percent)
          Returns a URI/URL-style percent-encoded copy of this byte array.
 java.lang.String toString()
          Returns a string representation of the this QByteArray.
 QByteArray toUpper()
          Returns an uppercase copy of the byte array.
 QByteArray trimmed()
          Returns a byte array that has whitespace removed from the start and the end.
 void truncate(int pos)
          Truncates the byte array at index position pos.
 void writeTo(QDataStream arg__1)
          Writes thisQByteArray
 
Methods inherited from class com.trolltech.qt.QtJambiObject
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr
 
Methods inherited from class com.trolltech.qt.QSignalEmitter
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread
 
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
__qt_signalInitialization
 
Methods inherited from class java.lang.Object
getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.lang.Comparable
compareTo
 
Methods inherited from interface com.trolltech.qt.QtJambiInterface
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership
 

Constructor Detail

QByteArray

public QByteArray()

QByteArray

public QByteArray(QByteArray arg__1)
Constructs a copy of other.

This operation takes constant time, because QByteArray is implicitly shared. This makes returning a QByteArray from a function very fast. If a shared instance is modified, it will be copied (copy-on-write), and that takes linear time.

See also:
operator=().


QByteArray

public QByteArray(int size,
                  byte c)
Constructs a byte array of size size with every byte set to character ch.

See also:
fill().


QByteArray

public QByteArray(java.lang.String s)
Constructs a byte array initialized with the string str.

QByteArray makes a deep copy of the string data.


QByteArray

public QByteArray(byte[] data)
Constructs a byte array containing the bytes of array data.

If data is null, a null byte array is constructed.

QByteArray makes a deep copy of the string data.

See also:
fromRawData().

Method Detail

at

public final byte at(int i)
Returns the character at index position i in the byte array.

i must be a valid index position in the byte array (i.e., 0 <= i < size()).

See also:
operator[]().


capacity

public final int capacity()
Returns the maximum number of bytes that can be stored in the byte array without forcing a reallocation.

The sole purpose of this function is to provide a means of fine tuning QByteArray's memory usage. In general, you will rarely ever need to call this function. If you want to know how many bytes are in the byte array, call size().

See also:
reserve(), and squeeze().


chop

public final void chop(int n)
Removes n bytes from the end of the byte array.

If n is greater than size(), the result is an empty byte array.

Example:

        QByteArray ba = new QByteArray("STARTTLS\r\n");
        ba.chop(2);                 // ba == "STARTTLS"

See also:
truncate(), resize(), and left().


clear

public final void clear()
Clears the contents of the byte array and makes it empty.

See also:
resize(), and isEmpty().


contains

public final boolean contains(byte c)
This is an overloaded member function, provided for convenience.

Returns true if the byte array contains the character ch; otherwise returns false.


contains

public final boolean contains(QByteArray a)
Returns true if the byte array contains an occurrence of the byte array ba; otherwise returns false.

See also:
indexOf(), and count().


count

public final int count(byte c)
This is an overloaded member function, provided for convenience.

Returns the number of occurrences of character ch in the byte array.

See also:
contains(), and indexOf().


count

public final int count(QByteArray a)
Returns the number of (potentially overlapping) occurrences of byte array ba in this byte array.

See also:
contains(), and indexOf().


data

public final QNativePointer data()
Returns a pointer to the data stored in the byte array. The pointer can be used to access and modify the bytes that compose the array. The data is '\0'-terminated.

Example:

        QByteArray ba = new QByteArray("Hello world");
        QNativePointer data = ba.data();

        int i = 0;
        while (data.byteAt(i) != 0) {
            System.out.println("[" + data.byteAt(i) + "]");
            ++i;
        }
The pointer remains valid as long as the byte array isn't reallocated or destroyed. For read-only access, constData() is faster because it never causes a deep copy to occur.

This function is mostly useful to pass a byte array to a function that accepts a const char *.

Note: A QByteArray can store any byte values including '\0's, but most functions that take char * arguments assume that the data ends at the first '\0' they encounter.

See also:
constData(), and operator[]().


endsWith

public final boolean endsWith(byte c)
This is an overloaded member function, provided for convenience.

Returns true if this byte array ends with character ch; otherwise returns false.


endsWith

public final boolean endsWith(QByteArray a)
Returns true if this byte array ends with byte array ba; otherwise returns false.

Example:

        QByteArray url = new QByteArray("http://www.trolltech.com/index.html");
        if (url.endsWith(".html"))
            System.out.println("foo");
            // ...

See also:
startsWith(), and right().


indexOf

public final int indexOf(byte c)
This is an overloaded member function, provided for convenience.

Returns the index position of the first occurrence of the character ch in the byte array, searching forward from index position from. Returns -1 if ch could not be found.

Example:

        QByteArray ba = new QByteArray("ABCBA");
        ba.indexOf("B");            // returns 1
        ba.indexOf("B", 1);         // returns 1
        ba.indexOf("B", 2);         // returns 3
        ba.indexOf("X");            // returns -1

See also:
lastIndexOf(), and contains().


indexOf

public final int indexOf(byte c,
                         int from)
This is an overloaded member function, provided for convenience.

Returns the index position of the first occurrence of the character ch in the byte array, searching forward from index position from. Returns -1 if ch could not be found.

Example:

        QByteArray ba = new QByteArray("ABCBA");
        ba.indexOf("B");            // returns 1
        ba.indexOf("B", 1);         // returns 1
        ba.indexOf("B", 2);         // returns 3
        ba.indexOf("X");            // returns -1

See also:
lastIndexOf(), and contains().


indexOf

public final int indexOf(QByteArray a)
Returns the index position of the first occurrence of the byte array ba in this byte array, searching forward from index position from. Returns -1 if ba could not be found.

Example:

        QByteArray x = new QByteArray("sticky question");
        QByteArray y = new QByteArray("sti");
        x.indexOf(y);               // returns 0
        x.indexOf(y, 1);            // returns 10
        x.indexOf(y, 10);           // returns 10
        x.indexOf(y, 11);           // returns -1

See also:
lastIndexOf(), contains(), and count().


indexOf

public final int indexOf(QByteArray a,
                         int from)
Returns the index position of the first occurrence of the byte array ba in this byte array, searching forward from index position from. Returns -1 if ba could not be found.

Example:

        QByteArray x = new QByteArray("sticky question");
        QByteArray y = new QByteArray("sti");
        x.indexOf(y);               // returns 0
        x.indexOf(y, 1);            // returns 10
        x.indexOf(y, 10);           // returns 10
        x.indexOf(y, 11);           // returns -1

See also:
lastIndexOf(), contains(), and count().


indexOf

public final int indexOf(java.lang.String s)
This is an overloaded member function, provided for convenience.

Returns the index position of the first occurrence of the string str in the byte array, searching forward from index position from. Returns -1 if str could not be found.

The Unicode data is converted into 8-bit characters using QString::toAscii().

If the QString contains non-ASCII Unicode characters, using this function can lead to loss of information. You can disable this function by defining QT_NO_CAST_TO_ASCII when you compile your applications. You then need to call QString::toAscii() (or QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit()) explicitly if you want to convert the data to const char *.


indexOf

public final int indexOf(java.lang.String s,
                         int from)
This is an overloaded member function, provided for convenience.

Returns the index position of the first occurrence of the string str in the byte array, searching forward from index position from. Returns -1 if str could not be found.

The Unicode data is converted into 8-bit characters using QString::toAscii().

If the QString contains non-ASCII Unicode characters, using this function can lead to loss of information. You can disable this function by defining QT_NO_CAST_TO_ASCII when you compile your applications. You then need to call QString::toAscii() (or QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit()) explicitly if you want to convert the data to const char *.


isEmpty

public final boolean isEmpty()
Returns true if the byte array has size 0; otherwise returns false.

Example:

        new QByteArray().isEmpty();         // returns true
        new QByteArray("").isEmpty();       // returns true
        new QByteArray("abc").isEmpty();    // returns false

See also:
size().


isNull

public final boolean isNull()
Returns true if this byte array is null; otherwise returns false.

Example:

        new QByteArray().isNull();          // returns true
        new QByteArray("").isNull();        // returns false
        new QByteArray("abc").isNull();     // returns false
Qt makes a distinction between null byte arrays and empty byte arrays for historical reasons. For most applications, what matters is whether or not a byte array contains any data, and this can be determined using isEmpty().

See also:
isEmpty().


lastIndexOf

public final int lastIndexOf(byte c)
This is an overloaded member function, provided for convenience.

Returns the index position of the last occurrence of character ch in the byte array, searching backward from index position from. If from is -1 (the default), the search starts at the last (size() - 1) byte. Returns -1 if ch could not be found.

Example:

        QByteArray ba = new QByteArray("ABCBA");
        ba.lastIndexOf("B");        // returns 3
        ba.lastIndexOf("B", 3);     // returns 3
        ba.lastIndexOf("B", 2);     // returns 1
        ba.lastIndexOf("X");        // returns -1

See also:
indexOf(), and contains().


lastIndexOf

public final int lastIndexOf(byte c,
                             int from)
This is an overloaded member function, provided for convenience.

Returns the index position of the last occurrence of character ch in the byte array, searching backward from index position from. If from is -1 (the default), the search starts at the last (size() - 1) byte. Returns -1 if ch could not be found.

Example:

        QByteArray ba = new QByteArray("ABCBA");
        ba.lastIndexOf("B");        // returns 3
        ba.lastIndexOf("B", 3);     // returns 3
        ba.lastIndexOf("B", 2);     // returns 1
        ba.lastIndexOf("X");        // returns -1

See also:
indexOf(), and contains().


lastIndexOf

public final int lastIndexOf(QByteArray a)
Returns the index position of the last occurrence of the byte array ba in this byte array, searching backward from index position from. If from is -1 (the default), the search starts at the last byte. Returns -1 if ba could not be found.

Example:

        QByteArray x = new QByteArray("crazy azimuths");
        QByteArray y = new QByteArray("azy");
        x.lastIndexOf(y);           // returns 6
        x.lastIndexOf(y, 6);        // returns 6
        x.lastIndexOf(y, 5);        // returns 2
        x.lastIndexOf(y, 1);        // returns -1

See also:
indexOf(), contains(), and count().


lastIndexOf

public final int lastIndexOf(QByteArray a,
                             int from)
Returns the index position of the last occurrence of the byte array ba in this byte array, searching backward from index position from. If from is -1 (the default), the search starts at the last byte. Returns -1 if ba could not be found.

Example:

        QByteArray x = new QByteArray("crazy azimuths");
        QByteArray y = new QByteArray("azy");
        x.lastIndexOf(y);           // returns 6
        x.lastIndexOf(y, 6);        // returns 6
        x.lastIndexOf(y, 5);        // returns 2
        x.lastIndexOf(y, 1);        // returns -1

See also:
indexOf(), contains(), and count().


lastIndexOf

public final int lastIndexOf(java.lang.String s)
This is an overloaded member function, provided for convenience.

Returns the index position of the last occurrence of the string str in the byte array, searching backward from index position from. If from is -1 (the default), the search starts at the last (size() - 1) byte. Returns -1 if str could not be found.

The Unicode data is converted into 8-bit characters using QString::toAscii().

If the QString contains non-ASCII Unicode characters, using this function can lead to loss of information. You can disable this function by defining QT_NO_CAST_TO_ASCII when you compile your applications. You then need to call QString::toAscii() (or QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit()) explicitly if you want to convert the data to const char *.


lastIndexOf

public final int lastIndexOf(java.lang.String s,
                             int from)
This is an overloaded member function, provided for convenience.

Returns the index position of the last occurrence of the string str in the byte array, searching backward from index position from. If from is -1 (the default), the search starts at the last (size() - 1) byte. Returns -1 if str could not be found.

The Unicode data is converted into 8-bit characters using QString::toAscii().

If the QString contains non-ASCII Unicode characters, using this function can lead to loss of information. You can disable this function by defining QT_NO_CAST_TO_ASCII when you compile your applications. You then need to call QString::toAscii() (or QString::toLatin1() or QString::toUtf8() or QString::toLocal8Bit()) explicitly if you want to convert the data to const char *.


left

public final QByteArray left(int len)
Returns a byte array that contains the leftmost len bytes of this byte array.

The entire byte array is returned if len is greater than size().

Example:

        QByteArray x = new QByteArray("Pineapple");
        QByteArray y = x.left(4);
        // y == "Pine"

See also:
right(), mid(), startsWith(), and truncate().


leftJustified

public final QByteArray leftJustified(int width,
                                      byte fill)
Returns a byte array of size width that contains this byte array padded by the fill character.

If truncate is false and the size() of the byte array is more than width, then the returned byte array is a copy of this byte array.

If truncate is true and the size() of the byte array is more than width, then any bytes in a copy of the byte array after position width are removed, and the copy is returned.

Example:

        QByteArray x = new QByteArray("apple");
        QByteArray y = x.leftJustified(8, (byte)'.', false);   // y == "apple..."

See also:
rightJustified().


leftJustified

public final QByteArray leftJustified(int width)
Returns a byte array of size width that contains this byte array padded by the fill character.

If truncate is false and the size() of the byte array is more than width, then the returned byte array is a copy of this byte array.

If truncate is true and the size() of the byte array is more than width, then any bytes in a copy of the byte array after position width are removed, and the copy is returned.

Example:

        QByteArray x = new QByteArray("apple");
        QByteArray y = x.leftJustified(8, (byte)'.', false);   // y == "apple..."

See also:
rightJustified().


leftJustified

public final QByteArray leftJustified(int width,
                                      byte fill,
                                      boolean truncate)
Returns a byte array of size width that contains this byte array padded by the fill character.

If truncate is false and the size() of the byte array is more than width, then the returned byte array is a copy of this byte array.

If truncate is true and the size() of the byte array is more than width, then any bytes in a copy of the byte array after position width are removed, and the copy is returned.

Example:

        QByteArray x = new QByteArray("apple");
        QByteArray y = x.leftJustified(8, (byte)'.', false);   // y == "apple..."

See also:
rightJustified().


length

public final int length()
Same as size().


mid

public final QByteArray mid(int index)
Returns a byte array containing len bytes from this byte array, starting at position pos.

If len is -1 (the default), or pos + len >= size(), returns a byte array containing all bytes starting at position pos until the end of the byte array.

Example:

        QByteArray x = new QByteArray("Five pineapples");
        QByteArray y = x.mid(5, 4);     // y == "pine"
        QByteArray z = x.mid(5);        // z == "pineapples"

See also:
left(), and right().


mid

public final QByteArray mid(int index,
                            int len)
Returns a byte array containing len bytes from this byte array, starting at position pos.

If len is -1 (the default), or pos + len >= size(), returns a byte array containing all bytes starting at position pos until the end of the byte array.

Example:

        QByteArray x = new QByteArray("Five pineapples");
        QByteArray y = x.mid(5, 4);     // y == "pine"
        QByteArray z = x.mid(5);        // z == "pineapples"

See also:
left(), and right().


writeTo

public final void writeTo(QDataStream arg__1)
Writes thisQByteArray


readFrom

public final void readFrom(QDataStream arg__1)
Reads a QByteArray


repeated

public final QByteArray repeated(int times)
Returns a copy of this byte array repeated the specified number of times.

If times is less than 1, an empty byte array is returned.

Example:

QByteArray ba("ab");
ba.repeated(4);             // returns "abababab"


reserve

public final void reserve(int size)
Attempts to allocate memory for at least size bytes. If you know in advance how large the byte array will be, you can call this function, and if you call resize() often you are likely to get better performance. If size is an underestimate, the worst that will happen is that the QByteArray will be a bit slower.

The sole purpose of this function is to provide a means of fine tuning QByteArray's memory usage. In general, you will rarely ever need to call this function. If you want to change the size of the byte array, call resize().

See also:
squeeze(), and capacity().


resize

public final void resize(int size)
Sets the size of the byte array to size bytes.

If size is greater than the current size, the byte array is extended to make it size bytes with the extra bytes added to the end. The new bytes are uninitialized.

If size is less than the current size, bytes are removed from the end.

See also:
size().


right

public final QByteArray right(int len)
Returns a byte array that contains the rightmost len bytes of this byte array.

The entire byte array is returned if len is greater than size().

Example:

        QByteArray x = new QByteArray("Pineapple");
        QByteArray y = x.right(5);
        // y == "apple"

See also:
endsWith(), left(), and mid().


rightJustified

public final QByteArray rightJustified(int width,
                                       byte fill)
Returns a byte array of size width that contains the fill character followed by this byte array.

If truncate is false and the size of the byte array is more than width, then the returned byte array is a copy of this byte array.

If truncate is true and the size of the byte array is more than width, then the resulting byte array is truncated at position width.

Example:

        QByteArray x = new QByteArray("apple");
        QByteArray y = x.rightJustified(8, (byte)'.', false);    // y == "...apple"

See also:
leftJustified().


rightJustified

public final QByteArray rightJustified(int width)
Returns a byte array of size width that contains the fill character followed by this byte array.

If truncate is false and the size of the byte array is more than width, then the returned byte array is a copy of this byte array.

If truncate is true and the size of the byte array is more than width, then the resulting byte array is truncated at position width.

Example:

        QByteArray x = new QByteArray("apple");
        QByteArray y = x.rightJustified(8, (byte)'.', false);    // y == "...apple"

See also:
leftJustified().


rightJustified

public final QByteArray rightJustified(int width,
                                       byte fill,
                                       boolean truncate)
Returns a byte array of size width that contains the fill character followed by this byte array.

If truncate is false and the size of the byte array is more than width, then the returned byte array is a copy of this byte array.

If truncate is true and the size of the byte array is more than width, then the resulting byte array is truncated at position width.

Example:

        QByteArray x = new QByteArray("apple");
        QByteArray y = x.rightJustified(8, (byte)'.', false);    // y == "...apple"

See also:
leftJustified().


simplified

public final QByteArray simplified()
Returns a byte array that has whitespace removed from the start and the end, and which has each sequence of internal whitespace replaced with a single space.

Whitespace means any character for which the standard C++ isspace() function returns true. This includes the ASCII characters '\t', '\n', '\v', '\f', '\r', and ' '.

Example:

        QByteArray ba = new QByteArray("  lots\t of\nwhitespace\r\n ");
        ba = ba.simplified();
        // ba == "lots of whitespace";

See also:
trimmed().


size

public final int size()
Returns the number of bytes in this byte array.

The last byte in the byte array is at position size() - 1. In addition, QByteArray ensures that the byte at position size() is always '\0', so that you can use the return value of data() and constData() as arguments to functions that expect '\0'-terminated strings.

Example:

        QByteArray ba = new QByteArray("Hello");
        int n = ba.size();          // n == 5
        byte a = ba.at(0);               // returns 'H'
        byte b = ba.at(4);               // returns 'o'
        byte c = ba.at(5);               // returns '\0'

See also:
isEmpty(), and resize().


split

public final java.util.List split(byte sep)
Splits the byte array into subarrays wherever sep occurs, and returns the list of those arrays. If sep does not match anywhere in the byte array, split() returns a single-element list containing this byte array.


squeeze

public final void squeeze()
Releases any memory not required to store the array's data.

The sole purpose of this function is to provide a means of fine tuning QByteArray's memory usage. In general, you will rarely ever need to call this function.

See also:
reserve(), and capacity().


startsWith

public final boolean startsWith(byte c)
This is an overloaded member function, provided for convenience.

Returns true if this byte array starts with character ch; otherwise returns false.


startsWith

public final boolean startsWith(QByteArray a)
Returns true if this byte array starts with byte array ba; otherwise returns false.

Example:

        QByteArray url = new QByteArray("ftp://ftp.trolltech.com/");
        if (url.startsWith("ftp:"))
            System.out.println("foo");
            // ...

See also:
endsWith(), and left().


toBase64

public final QByteArray toBase64()
Returns a copy of the byte array, encoded as Base64.
        QByteArray text = new QByteArray("Qt is great!");
        text.toBase64();        // returns "UXQgaXMgZ3JlYXQh"
The algorithm used to encode Base64-encoded data is defined in RFC 2045.

See also:
fromBase64().


toHex

public final QByteArray toHex()
Returns a hex encoded copy of the byte array. The hex encoding uses the numbers 0-9 and the letters a-f.

See also:
fromHex().


toLower

public final QByteArray toLower()
Returns a lowercase copy of the byte array. The bytearray is interpreted as a Latin-1 encoded string.

Example:

        QByteArray x = new QByteArray("TROlltECH");
        QByteArray y = x.toLower();
        // y == "trolltech"

See also:
toUpper(), and 8-bit Character Comparisons.


toPercentEncoding

public final QByteArray toPercentEncoding(QByteArray exclude,
                                          QByteArray include)
Returns a URI/URL-style percent-encoded copy of this byte array. The percent parameter allows you to override the default '%' character for another.

By default, this function will encode all characters that are not one of the following:

ALPHA ("a" to "z" and "A" to "Z") / DIGIT (0 to 9) / "-" / "." / "_" / "~"

To prevent characters from being encoded pass them to exclude. To force characters to be encoded pass them to include. The percent character is always encoded.

Example:

QByteArray text = "{a fishy string?}";
QByteArray ba = text.toPercentEncoding("{}", "s");
qDebug(ba.constData());
// prints "{a fi%73hy %73tring%3F}"
The hex encoding uses the numbers 0-9 and the uppercase letters A-F.

See also:
fromPercentEncoding(), and QUrl::toPercentEncoding().


toPercentEncoding

public final QByteArray toPercentEncoding(QByteArray exclude)
Returns a URI/URL-style percent-encoded copy of this byte array. The percent parameter allows you to override the default '%' character for another.

By default, this function will encode all characters that are not one of the following:

ALPHA ("a" to "z" and "A" to "Z") / DIGIT (0 to 9) / "-" / "." / "_" / "~"

To prevent characters from being encoded pass them to exclude. To force characters to be encoded pass them to include. The percent character is always encoded.

Example:

QByteArray text = "{a fishy string?}";
QByteArray ba = text.toPercentEncoding("{}", "s");
qDebug(ba.constData());
// prints "{a fi%73hy %73tring%3F}"
The hex encoding uses the numbers 0-9 and the uppercase letters A-F.

See also:
fromPercentEncoding(), and QUrl::toPercentEncoding().


toPercentEncoding

public final QByteArray toPercentEncoding()
Returns a URI/URL-style percent-encoded copy of this byte array. The percent parameter allows you to override the default '%' character for another.

By default, this function will encode all characters that are not one of the following:

ALPHA ("a" to "z" and "A" to "Z") / DIGIT (0 to 9) / "-" / "." / "_" / "~"

To prevent characters from being encoded pass them to exclude. To force characters to be encoded pass them to include. The percent character is always encoded.

Example:

QByteArray text = "{a fishy string?}";
QByteArray ba = text.toPercentEncoding("{}", "s");
qDebug(ba.constData());
// prints "{a fi%73hy %73tring%3F}"
The hex encoding uses the numbers 0-9 and the uppercase letters A-F.

See also:
fromPercentEncoding(), and QUrl::toPercentEncoding().


toPercentEncoding

public final QByteArray toPercentEncoding(QByteArray exclude,
                                          QByteArray include,
                                          byte percent)
Returns a URI/URL-style percent-encoded copy of this byte array. The percent parameter allows you to override the default '%' character for another.

By default, this function will encode all characters that are not one of the following:

ALPHA ("a" to "z" and "A" to "Z") / DIGIT (0 to 9) / "-" / "." / "_" / "~"

To prevent characters from being encoded pass them to exclude. To force characters to be encoded pass them to include. The percent character is always encoded.

Example:

QByteArray text = "{a fishy string?}";
QByteArray ba = text.toPercentEncoding("{}", "s");
qDebug(ba.constData());
// prints "{a fi%73hy %73tring%3F}"
The hex encoding uses the numbers 0-9 and the uppercase letters A-F.

See also:
fromPercentEncoding(), and QUrl::toPercentEncoding().


toUpper

public final QByteArray toUpper()
Returns an uppercase copy of the byte array. The bytearray is interpreted as a Latin-1 encoded string.

Example:

        QByteArray x = new QByteArray("TROlltECH");
        QByteArray y = x.toUpper();
        // y == "TROLLTECH"

See also:
toLower(), and 8-bit Character Comparisons.


trimmed

public final QByteArray trimmed()
Returns a byte array that has whitespace removed from the start and the end.

Whitespace means any character for which the standard C++ isspace() function returns true. This includes the ASCII characters '\t', '\n', '\v', '\f', '\r', and ' '.

Example:

        QByteArray ba = new QByteArray("  lots\t of\nwhitespace\r\n ");
        ba = ba.trimmed();
        // ba == "lots\t of\nwhitespace";
Unlike simplified(), trimmed() leaves internal whitespace alone.

See also:
simplified().


truncate

public final void truncate(int pos)
Truncates the byte array at index position pos.

If pos is beyond the end of the array, nothing happens.

Example:

        QByteArray ba = new QByteArray("Stockholm");
        ba.truncate(5);             // ba == "Stock"

See also:
chop(), resize(), and left().


fromBase64

public static QByteArray fromBase64(QByteArray base64)
Returns a decoded copy of the Base64 array base64. Input is not checked for validity; invalid characters in the input are skipped, enabling the decoding process to continue with subsequent characters.

For example:

        QByteArray text = QByteArray.fromBase64(new QByteArray("UXQgaXMgZ3JlYXQh"));
        text.data();            // returns "Qt is great!"
The algorithm used to decode Base64-encoded data is defined in RFC 2045.

See also:
toBase64().


fromHex

public static QByteArray fromHex(QByteArray hexEncoded)
Returns a decoded copy of the hex encoded array hexEncoded. Input is not checked for validity; invalid characters in the input are skipped, enabling the decoding process to continue with subsequent characters.

For example:

        QByteArray text = QByteArray.fromHex(new QByteArray("517420697320677265617421"));
        text.data();            // returns "Qt is great!"

See also:
toHex().


fromPercentEncoding

public static QByteArray fromPercentEncoding(QByteArray pctEncoded)
Returns a decoded copy of the URI/URL-style percent-encoded input. The percent parameter allows you to replace the '%' character for another (for instance, '_' or '=').

For example:

QByteArray text = QByteArray::fromPercentEncoding("Qt%20is%20great%33");
text.data();            // returns "Qt is great!"

See also:
toPercentEncoding(), and QUrl::fromPercentEncoding().


fromPercentEncoding

public static QByteArray fromPercentEncoding(QByteArray pctEncoded,
                                             byte percent)
Returns a decoded copy of the URI/URL-style percent-encoded input. The percent parameter allows you to replace the '%' character for another (for instance, '_' or '=').

For example:

QByteArray text = QByteArray::fromPercentEncoding("Qt%20is%20great%33");
text.data();            // returns "Qt is great!"

See also:
toPercentEncoding(), and QUrl::fromPercentEncoding().


number

public static QByteArray number(double arg__1,
                                byte f)
This is an overloaded member function, provided for convenience.

Returns a byte array that contains the printed value of n, formatted in format f with precision prec.

Argument n is formatted according to the f format specified, which is g by default, and can be any of the following:

Format
Meaning
e format as [-]9.9e[+|-]999
E format as [-]9.9E[+|-]999
f format as [-]9.9
g use e or f format, whichever is the most concise
G use E or f format, whichever is the most concise
With 'e', 'E', and 'f', prec is the number of digits after the decimal point. With 'g' and 'G', prec is the maximum number of significant digits (trailing zeroes are omitted).
        QByteArray ba = QByteArray.number(12.3456, (byte)'E', 3);
        // ba == 1.235E+01
Note: The format of the number is not localized; the default C locale is used irrespective of the user's locale.

See also:
toDouble().


number

public static QByteArray number(double arg__1)
This is an overloaded member function, provided for convenience.

Returns a byte array that contains the printed value of n, formatted in format f with precision prec.

Argument n is formatted according to the f format specified, which is g by default, and can be any of the following:

Format
Meaning
e format as [-]9.9e[+|-]999
E format as [-]9.9E[+|-]999
f format as [-]9.9
g use e or f format, whichever is the most concise
G use E or f format, whichever is the most concise
With 'e', 'E', and 'f', prec is the number of digits after the decimal point. With 'g' and 'G', prec is the maximum number of significant digits (trailing zeroes are omitted).
        QByteArray ba = QByteArray.number(12.3456, (byte)'E', 3);
        // ba == 1.235E+01
Note: The format of the number is not localized; the default C locale is used irrespective of the user's locale.

See also:
toDouble().


number

public static QByteArray number(double arg__1,
                                byte f,
                                int prec)
This is an overloaded member function, provided for convenience.

Returns a byte array that contains the printed value of n, formatted in format f with precision prec.

Argument n is formatted according to the f format specified, which is g by default, and can be any of the following:

Format
Meaning
e format as [-]9.9e[+|-]999
E format as [-]9.9E[+|-]999
f format as [-]9.9
g use e or f format, whichever is the most concise
G use E or f format, whichever is the most concise
With 'e', 'E', and 'f', prec is the number of digits after the decimal point. With 'g' and 'G', prec is the maximum number of significant digits (trailing zeroes are omitted).
        QByteArray ba = QByteArray.number(12.3456, (byte)'E', 3);
        // ba == 1.235E+01
Note: The format of the number is not localized; the default C locale is used irrespective of the user's locale.

See also:
toDouble().


number

public static QByteArray number(int arg__1)
Returns a byte array containing the string equivalent of the number n to base base (10 by default). The base can be any value between 2 and 36.

Example:

        int n = 63;
        QByteArray.number(n);              // returns "63"
        QByteArray.number(n, 16);          // returns "3f"
        QByteArray.number(n, 16).toUpper();  // returns "3F"
Note: The format of the number is not localized; the default C locale is used irrespective of the user's locale.

See also:
setNum(), and toInt().


number

public static QByteArray number(int arg__1,
                                int base)
Returns a byte array containing the string equivalent of the number n to base base (10 by default). The base can be any value between 2 and 36.

Example:

        int n = 63;
        QByteArray.number(n);              // returns "63"
        QByteArray.number(n, 16);          // returns "3f"
        QByteArray.number(n, 16).toUpper();  // returns "3F"
Note: The format of the number is not localized; the default C locale is used irrespective of the user's locale.

See also:
setNum(), and toInt().


number

public static QByteArray number(long arg__1)
This is an overloaded member function, provided for convenience.

See also:
toLongLong().


number

public static QByteArray number(long arg__1,
                                int base)
Returns a byte array containing the string equivalent of the number arg__1 to base base. The base can be any value between 2 and 36.

Example:

    int n = 63;
    QByteArray.number(n, 16);          // returns "3f"
    QByteArray.number(n, 16).upper();  // returns "3F"


toString

public java.lang.String toString()
Returns a string representation of the this QByteArray.

Overrides:
toString in class java.lang.Object

contains

public final boolean contains(java.lang.String str)
Returns true there is at least one occurrence of str in this QByteArray.


count

public final int count(java.lang.String str)
Returns the number of occurrences of str in this QByteArray.


endsWith

public final boolean endsWith(java.lang.String str)
Returns true if this QByteArray ends with str; otherwise, returns false.


prepend

public final QByteArray prepend(java.lang.String str)
Prepends str to this QByteArray, and returns the resulting array.


replace

public final QByteArray replace(QByteArray before,
                                java.lang.String after)
Replaces every occurrence of the byte array before with the string after.


replace

public final QByteArray replace(java.lang.String before,
                                java.lang.String after)
Replaces every occurrence of before with after.


startsWith

public final boolean startsWith(java.lang.String str)
Returns true if this byte array starts with string str; otherwise returns false.


toByteArray

public final byte[] toByteArray()
Returns the contents of this QByteArray.


set

public final QByteArray set(QByteArray other)
This function sets the contents of this QByteArray equal to other.


toChar

public final char toChar(int base)
                  throws java.lang.NumberFormatException
Returns the byte array converted to an char using base base, which is 10 by default and must be between 2 and 36, or 0.

Throws:
java.lang.NumberFormatException

toChar

public char toChar()
Returns the byte array converted to a char.


toInt

public final int toInt(int base)
                throws java.lang.NumberFormatException
Returns the byte array converted to an int using base base, which is 10 by default and must be between 2 and 36, or 0.

If base is 0, the base is determined automatically using the following rules: If the byte array begins with "0x", it is assumed to be hexadecimal; if it begins with "0", it is assumed to be octal; otherwise it is assumed to be decimal.

The function throws NumberFormatException if conversion fails.

    QByteArray str = new QByteArray("FF");
    int hex = str.toInt(16);     // hex == 255,
    int dec = str.toInt(10);     // throws NumberFormatException

Throws:
java.lang.NumberFormatException

toInt

public int toInt()
Returns the byte array converted to an int using base 10.


toDouble

public final double toDouble()
                      throws java.lang.NumberFormatException
Returns the byte array converted to an double.

Throws:
java.lang.NumberFormatException

toFloat

public final float toFloat()
                    throws java.lang.NumberFormatException
Returns the byte array converted to an float.

Throws:
java.lang.NumberFormatException

append

public final QByteArray append(java.lang.String other)
This function appends the contents of other to the end of this QByteArray.


append

public final QByteArray append(QByteArray other)
This function appends the contents of other to the end of this QByteArray.


append

public final QByteArray append(byte other)
This function appends other to the end of this QByteArray.


fill

public final QByteArray fill(byte b,
                             int size)
Sets every byte in the byte array to character b. If size is different from -1 (the default), the byte array is resized to size size beforehand.

Example:

    QByteArray ba = new QByteArray("Istanbul");
    ba.fill("o");
    // ba == "oooooooo"

    ba.fill("X", 2);
    // ba == "XX"


fill

public QByteArray fill(byte b)
Sets every byte in the byte array to character b.


insert

public final QByteArray insert(int i,
                               QByteArray ba)
Inserts the byte array ba at index position i and returns a reference to this byte array.

Example:

    QByteArray ba = new QByteArray("Meal");
    ba.insert(1, QByteArray("ontr"));
    // ba == "Montreal"


insert

public final QByteArray insert(int i,
                               byte b)
Inserts byte b at index position i in the byte array. If i is greater than size(), the array is first extended using resize().


insert

public final QByteArray insert(int i,
                               java.lang.String str)
Inserts String str at index position i in the byte array. If i is greater than size(), the array is first extended using resize().


prepend

public final QByteArray prepend(QByteArray other)
Prepends other to this QByteArray, and returns the resulting array.


prepend

public final QByteArray prepend(byte other)
Prepends other to this QByteArray, and returns the resulting array.


remove

public final QByteArray remove(int pos,
                               int len)
Removes len bytes from the array, starting at index position pos, and returns a reference to the array.

If pos is out of range, nothing happens. If pos is valid, but pos + len is larger than the size of the array, the array is truncated at position pos.

Example:

    QByteArray ba = new QByteArray("Montreal");
    ba.remove(1, 4);
    // ba == "Meal"


replace

public final QByteArray replace(byte before,
                                QByteArray after)
Replaces every occurrence of before with after.


replace

public final QByteArray replace(int pos,
                                int len,
                                QByteArray after)
Replaces every occurrence of before with after.


replace

public final QByteArray replace(byte before,
                                java.lang.String after)
Replaces every occurrence of before with after.


replace

public final QByteArray replace(byte before,
                                byte after)
Replaces every occurrence of before with after.


replace

public final QByteArray replace(QByteArray before,
                                QByteArray after)
Replaces every occurrence of before with after.


replace

public final QByteArray replace(java.lang.String before,
                                QByteArray after)
Replaces every occurrence of before with after.


setNum

public final QByteArray setNum(int n,
                               int base)
Sets the array to the printed value of n using base as base.


setNum

public QByteArray setNum(int n)
Sets the array to the printed value of n


setNum

public final QByteArray setNum(char n,
                               int base)

See also.
toShort().


setNum

public QByteArray setNum(char n)

See also.
toUShort().


setNum

public final QByteArray setNum(float n,
                               char f,
                               int prec)
Sets the byte array to the printed value of n, formatted in format f with precision prec, and returns a reference to the byte array.


setNum

public final QByteArray setNum(float n,
                               char f)
Sets the byte array to the printed value of n, formatted in format f with precision 6, and returns a reference to the byte array.


setNum

public final QByteArray setNum(float n)
Sets the byte array to the printed value of n, formatted in format f with precision 6, and returns a reference to the byte array.


setNum

public final QByteArray setNum(long n,
                               int base)
This is an overloaded function provided for convenience.


setNum

public QByteArray setNum(long n)
This is an overloaded function provided for convenience.


setNum

public final QByteArray setNum(double n,
                               char f,
                               int prec)
Sets the byte array to the printed value of n, formatted in format f with precision prec, and returns a reference to the byte array.


setNum

public final QByteArray setNum(double n,
                               char f)
This is an overloaded function provided for convenience.


setNum

public final QByteArray setNum(double n)
This is an overloaded function provided for convenience.


setNum

public final QByteArray setNum(short n,
                               int base)
This is an overloaded function provided for convenience.


setNum

public QByteArray setNum(short n)
This is an overloaded function provided for convenience.


clone

public QByteArray clone()
This method is reimplemented for internal reasons

Overrides:
clone in class java.lang.Object