QSysInfo Class

The QSysInfo class provides information about the system. More...

Header: #include <QSysInfo>
qmake: QT += core

Public Types

enum Endian { BigEndian, LittleEndian, ByteOrder }
enum MacVersion { MV_9, MV_10_0, MV_10_1, MV_10_2, ..., MV_None }
enum Sizes { WordSize }
enum WinVersion { WV_32s, WV_95, WV_98, WV_Me, ..., WV_None }

Static Public Members

const MacVersion MacintoshVersion
const WinVersion WindowsVersion
QString buildAbi()
QString buildCpuArchitecture()
QString currentCpuArchitecture()
QString kernelType()
QString kernelVersion()
MacVersion macVersion()
QString machineHostName()
QString prettyProductName()
QString productType()
QString productVersion()
WinVersion windowsVersion()

Detailed Description

The QSysInfo class provides information about the system.

  • WordSize specifies the size of a pointer for the platform on which the application is compiled.
  • ByteOrder specifies whether the platform is big-endian or little-endian.
  • WindowsVersion specifies the version of the Windows operating system on which the application is run.
  • MacintoshVersion specifies the version of the Macintosh operating system on which the application is run.

Some constants are defined only on certain platforms. You can use the preprocessor symbols Q_OS_WIN and Q_OS_OSX to test that the application is compiled under Windows or OS X.

See also QLibraryInfo.

Member Type Documentation

enum QSysInfo::Endian

ConstantValueDescription
QSysInfo::BigEndian0Big-endian byte order (also called Network byte order)
QSysInfo::LittleEndian1Little-endian byte order
QSysInfo::ByteOrder<platform-dependent>Equals BigEndian or LittleEndian, depending on the platform's byte order.

enum QSysInfo::MacVersion

This enum provides symbolic names for the various versions of the Darwin operating system, covering both OS X and iOS. The QSysInfo::MacintoshVersion variable gives the version of the system on which the application is run.

ConstantValueDescription
QSysInfo::MV_9Q_MV_OSX( 9, 0 )Mac OS 9
QSysInfo::MV_10_0Q_MV_OSX( 10, 0 )Mac OS X 10.0
QSysInfo::MV_10_1Q_MV_OSX( 10, 1 )Mac OS X 10.1
QSysInfo::MV_10_2Q_MV_OSX( 10, 2 )Mac OS X 10.2
QSysInfo::MV_10_3Q_MV_OSX( 10, 3 )Mac OS X 10.3
QSysInfo::MV_10_4Q_MV_OSX( 10, 4 )Mac OS X 10.4
QSysInfo::MV_10_5Q_MV_OSX( 10, 5 )Mac OS X 10.5
QSysInfo::MV_10_6Q_MV_OSX( 10, 6 )Mac OS X 10.6
QSysInfo::MV_10_7Q_MV_OSX( 10, 7 )Mac OS X 10.7
QSysInfo::MV_10_8Q_MV_OSX( 10, 8 )OS X 10.8
QSysInfo::MV_10_9Q_MV_OSX( 10, 9 )OS X 10.9
QSysInfo::MV_10_10Q_MV_OSX( 10, 10 )OS X 10.10
QSysInfo::MV_10_11Q_MV_OSX( 10, 11 )OS X 10.11
QSysInfo::MV_Unknown0x0000An unknown and currently unsupported platform
QSysInfo::MV_CHEETAHMV_10_0Apple codename for MV_10_0
QSysInfo::MV_PUMAMV_10_1Apple codename for MV_10_1
QSysInfo::MV_JAGUARMV_10_2Apple codename for MV_10_2
QSysInfo::MV_PANTHERMV_10_3Apple codename for MV_10_3
QSysInfo::MV_TIGERMV_10_4Apple codename for MV_10_4
QSysInfo::MV_LEOPARDMV_10_5Apple codename for MV_10_5
QSysInfo::MV_SNOWLEOPARDMV_10_6Apple codename for MV_10_6
QSysInfo::MV_LIONMV_10_7Apple codename for MV_10_7
QSysInfo::MV_MOUNTAINLIONMV_10_8Apple codename for MV_10_8
QSysInfo::MV_MAVERICKSMV_10_9Apple codename for MV_10_9
QSysInfo::MV_YOSEMITEMV_10_10Apple codename for MV_10_10
QSysInfo::MV_ELCAPITANMV_10_11Apple codename for MV_10_11
QSysInfo::MV_IOS1<<8iOS (any)
QSysInfo::MV_IOS_4_3?iOS 4.3
QSysInfo::MV_IOS_5_0?iOS 5.0
QSysInfo::MV_IOS_5_1?iOS 5.1
QSysInfo::MV_IOS_6_0?iOS 6.0
QSysInfo::MV_IOS_6_1?iOS 6.1
QSysInfo::MV_IOS_7_0?iOS 7.0
QSysInfo::MV_IOS_7_1?iOS 7.1
QSysInfo::MV_IOS_8_0?iOS 8.0
QSysInfo::MV_IOS_8_1?iOS 8.1
QSysInfo::MV_IOS_8_2?iOS 8.2
QSysInfo::MV_IOS_8_3?iOS 8.3
QSysInfo::MV_IOS_8_4?iOS 8.4
QSysInfo::MV_IOS_9_0?iOS 9.0
QSysInfo::MV_None0xffffNot a Darwin operating system

See also WinVersion.

enum QSysInfo::Sizes

This enum provides platform-specific information about the sizes of data structures used by the underlying architecture.

ConstantValueDescription
QSysInfo::WordSize( sizeof( void * ) <<3 )The size in bits of a pointer for the platform on which the application is compiled (32 or 64).

enum QSysInfo::WinVersion

This enum provides symbolic names for the various versions of the Windows operating system. On Windows, the QSysInfo::WindowsVersion variable gives the version of the system on which the application is run.

MS-DOS-based versions:

ConstantValueDescription
QSysInfo::WV_32s0x0001Windows 3.1 with Win 32s
QSysInfo::WV_950x0002Windows 95
QSysInfo::WV_980x0003Windows 98
QSysInfo::WV_Me0x0004Windows Me

NT-based versions (note that each operating system version is only represented once rather than each Windows edition):

ConstantValueDescription
QSysInfo::WV_NT0x0010Windows NT (operating system version 4.0)
QSysInfo::WV_20000x0020Windows 2000 (operating system version 5.0)
QSysInfo::WV_XP0x0030Windows XP (operating system version 5.1)
QSysInfo::WV_20030x0040Windows Server 2003, Windows Server 2003 R2, Windows Home Server, Windows XP Professional x64 Edition (operating system version 5.2)
QSysInfo::WV_VISTA0x0080Windows Vista, Windows Server 2008 (operating system version 6.0)
QSysInfo::WV_WINDOWS70x0090Windows 7, Windows Server 2008 R2 (operating system version 6.1)
QSysInfo::WV_WINDOWS80x00a0Windows 8 (operating system version 6.2)
QSysInfo::WV_WINDOWS8_10x00b0Windows 8.1 (operating system version 6.3), introduced in Qt 5.2
QSysInfo::WV_WINDOWS100x00c0Windows 10 (operating system version 10.0), introduced in Qt 5.5

Alternatively, you may use the following macros which correspond directly to the Windows operating system version number:

ConstantValueDescription
QSysInfo::WV_4_0WV_NTOperating system version 4.0, corresponds to Windows NT
QSysInfo::WV_5_0WV_2000Operating system version 5.0, corresponds to Windows 2000
QSysInfo::WV_5_1WV_XPOperating system version 5.1, corresponds to Windows XP
QSysInfo::WV_5_2WV_2003Operating system version 5.2, corresponds to Windows Server 2003, Windows Server 2003 R2, Windows Home Server, and Windows XP Professional x64 Edition
QSysInfo::WV_6_0WV_VISTAOperating system version 6.0, corresponds to Windows Vista and Windows Server 2008
QSysInfo::WV_6_1WV_WINDOWS7Operating system version 6.1, corresponds to Windows 7 and Windows Server 2008 R2
QSysInfo::WV_6_2WV_WINDOWS8Operating system version 6.2, corresponds to Windows 8
QSysInfo::WV_6_3WV_WINDOWS8_1Operating system version 6.3, corresponds to Windows 8.1, introduced in Qt 5.2
QSysInfo::WV_10_0WV_WINDOWS10Operating system version 10.0, corresponds to Windows 10, introduced in Qt 5.5

CE-based versions:

ConstantValueDescription
QSysInfo::WV_CE0x0100Windows CE
QSysInfo::WV_CENET0x0200Windows CE .NET
QSysInfo::WV_CE_50x0300Windows CE 5.x
QSysInfo::WV_CE_60x0400Windows CE 6.x

The following masks can be used for testing whether a Windows version is MS-DOS-based, NT-based, or CE-based:

ConstantValueDescription
QSysInfo::WV_DOS_based0x000fMS-DOS-based version of Windows
QSysInfo::WV_NT_based0x00f0NT-based version of Windows
QSysInfo::WV_CE_based0x0f00CE-based version of Windows
QSysInfo::WV_None0x0000Operating system other than Windows.

See also MacVersion.

Member Function Documentation

[static] QString QSysInfo::buildAbi()

Returns the full architecture string that Qt was compiled for. This string is useful for identifying different, incompatible builds. For example, it can be used as an identifier to request an upgrade package from a server.

The values returned from this function are kept stable as follows: the mandatory components of the result will not change in future versions of Qt, but optional suffixes may be added.

The returned value is composed of three or more parts, separated by dashes ("-"). They are:

ComponentValue
CPU ArchitectureThe same as QSysInfo::buildCpuArchitecture(), such as "arm", "i386", "mips" or "x86_64"
Endianness"little_endian" or "big_endian"
Word sizeWhether it's a 32- or 64-bit application. Possible values are: "llp64" (Windows 64-bit), "lp64" (Unix 64-bit), "ilp32" (32-bit)
(Optional) ABIZero or more components identifying different ABIs possible in this architecture. Currently, Qt has optional ABI components for ARM and MIPS processors: one component is the main ABI (such as "eabi", "o32", "n32", "o64"); another is whether the calling convention is using hardware floating point registers ("hardfloat" is present).

Additionally, if Qt was configured with -qreal float, the ABI option tag "qreal_float" will be present. If Qt was configured with another type as qreal, that type is present after "qreal_", with all characters other than letters and digits escaped by an underscore, followed by two hex digits. For example, -qreal long double becomes "qreal_long_20double".

This function was introduced in Qt 5.4.

See also QSysInfo::buildCpuArchitecture().

[static] QString QSysInfo::buildCpuArchitecture()

Returns the architecture of the CPU that Qt was compiled for, in text format. Note that this may not match the actual CPU that the application is running on if there's an emulation layer or if the CPU supports multiple architectures (like x86-64 processors supporting i386 applications). To detect that, use currentCpuArchitecture().

Values returned by this function are stable and will not change over time, so applications can rely on the returned value as an identifier, except that new CPU types may be added over time.

Typical returned values are (note: list not exhaustive):

  • "arm"
  • "arm64"
  • "i386"
  • "ia64"
  • "mips"
  • "mips64"
  • "power"
  • "power64"
  • "sparc"
  • "sparcv9"
  • "x86_64"

This function was introduced in Qt 5.4.

See also QSysInfo::buildAbi() and QSysInfo::currentCpuArchitecture().

[static] QString QSysInfo::currentCpuArchitecture()

Returns the architecture of the CPU that the application is running on, in text format. Note that this function depends on what the OS will report and may not detect the actual CPU architecture if the OS hides that information or is unable to provide it. For example, a 32-bit OS running on a 64-bit CPU is usually unable to determine the CPU is actually capable of running 64-bit programs.

Values returned by this function are mostly stable: an attempt will be made to ensure that they stay constant over time and match the values returned by QSysInfo::builldCpuArchitecture(). However, due to the nature of the operating system functions being used, there may be discrepancies.

Typical returned values are (note: list not exhaustive):

  • "arm"
  • "arm64"
  • "i386"
  • "ia64"
  • "mips"
  • "mips64"
  • "power"
  • "power64"
  • "sparc"
  • "sparcv9"
  • "x86_64"

This function was introduced in Qt 5.4.

See also QSysInfo::buildAbi() and QSysInfo::buildCpuArchitecture().

[static] QString QSysInfo::kernelType()

Returns the type of the operating system kernel Qt was compiled for. It's also the kernel the application is running on, unless the host operating system is running a form of compatibility or virtualization layer.

Values returned by this function are stable and will not change over time, so applications can rely on the returned value as an identifier, except that new OS kernel types may be added over time.

On Windows, this function returns the type of Windows kernel, like "wince" or "winnt". On Unix systems, it returns the same as the output of uname -s (lowercased).

Note that this function may return surprising values: it returns "linux" for all operating systems running Linux (including Android), "qnx" for all operating systems running QNX, "freebsd" for Debian/kFreeBSD, and "darwin" for OS X and iOS. For information on the type of product the application is running on, see productType().

This function was introduced in Qt 5.4.

See also QFileSelector, kernelVersion(), productType(), productVersion(), and prettyProductName().

[static] QString QSysInfo::kernelVersion()

Returns the release version of the operating system kernel. On Windows, it returns the version of the NT or CE kernel. On Unix systems, including Android and OS X, it returns the same as the uname -r command would return.

If the version could not be determined, this function may return an empty string.

This function was introduced in Qt 5.4.

See also kernelType(), productType(), productVersion(), and prettyProductName().

[static] MacVersion QSysInfo::macVersion()

Returns the version of Darwin (OS X or iOS) on which the application is run, or MV_None if the operating system is not a version of Darwin.

[static] QString QSysInfo::machineHostName()

Returns this machine's host name, if one is configured. Note that hostnames are not guaranteed to be globally unique, especially if they were configured automatically.

This function does not guarantee the returned host name is a Fully Qualified Domain Name (FQDN). For that, use QHostInfo to resolve the returned name to an FQDN.

This function returns the same as QHostInfo::localHostName().

This function was introduced in Qt 5.6.

See also QHostInfo::localDomainName.

[static] QString QSysInfo::prettyProductName()

Returns a prettier form of productType() and productVersion(), containing other tokens like the operating system type, codenames and other information. The result of this function is suitable for displaying to the user, but not for long-term storage, as the string may change with updates to Qt.

If productType() is "unknown", this function will instead use the kernelType() and kernelVersion() functions.

This function was introduced in Qt 5.4.

See also kernelType(), kernelVersion(), productType(), and productVersion().

[static] QString QSysInfo::productType()

Returns the product name of the operating system this application is running in. If the application is running on some sort of emulation or virtualization layer (such as WINE on a Unix system), this function will inspect the emulation / virtualization layer.

Values returned by this function are stable and will not change over time, so applications can rely on the returned value as an identifier, except that new OS types may be added over time.

Linux and Android note: this function returns "android" for Linux systems running Android userspace, notably when using the Bionic library. For all other Linux systems, regardless of C library being used, it tries to determine the distribution name and returns that. If determining the distribution name failed, it returns "unknown".

Darwin, OS X and iOS note: this function returns "osx" for OS X systems, "ios" for iOS systems and "darwin" in case the system could not be determined.

FreeBSD note: this function returns "debian" for Debian/kFreeBSD and "unknown" otherwise.

Windows note: this function returns "winphone" for builds for Windows Phone, "winrt" for WinRT builds, "wince" for Windows CE and Embedded Compact builds, and "windows" for normal desktop builds.

For other Unix-type systems, this function usually returns "unknown".

This function was introduced in Qt 5.4.

See also QFileSelector, kernelType(), kernelVersion(), productVersion(), and prettyProductName().

[static] QString QSysInfo::productVersion()

Returns the product version of the operating system in string form. If the version could not be determined, this function returns "unknown".

It will return the Android, iOS, OS X, Windows full-product versions on those systems. In particular, on OS X, iOS and Windows, the returned string is similar to the macVersion() or windowsVersion() enums.

On Linux systems, it will try to determine the distribution version and will return that. This is also done on Debian/kFreeBSD, so this function will return Debian version in that case.

In all other Unix-type systems, this function always returns "unknown".

Note: The version string returned from this function is only guaranteed to be orderable on Android, OS X and iOS. On Windows, some Windows versions are text ("XP" and "Vista", for example). On Linux, the version of the distribution may jump unexpectedly, please refer to the distribution's documentation for versioning practices.

This function was introduced in Qt 5.4.

See also kernelType(), kernelVersion(), productType(), and prettyProductName().

[static] WinVersion QSysInfo::windowsVersion()

Returns the version of the Windows operating system on which the application is run, or WV_None if the operating system is not Windows.

This function was introduced in Qt 4.4.

Member Variable Documentation

const MacVersion QSysInfo::MacintoshVersion

This variable holds the version of the Macintosh operating system on which the application is run.

const WinVersion QSysInfo::WindowsVersion

This variable holds the version of the Windows operating system on which the application is run.

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