Qt Reference Documentation

QPictureFormatPlugin Class Reference

The QPictureFormatPlugin class provides an abstract base for custom picture format plugins. More...

 #include <QPictureFormatPlugin>

This class is obsolete. It is provided to keep old source code working. We strongly advise against using it in new code.

Inherits QObject.

Public Functions

QPictureFormatPlugin ( QObject * parent = 0 )
~QPictureFormatPlugin ()

Reimplemented Public Functions

virtual bool installIOHandler ( const QString & format ) = 0
virtual QStringList keys () const = 0
virtual bool loadPicture ( const QString & format, const QString & fileName, QPicture * picture )
virtual bool savePicture ( const QString & format, const QString & fileName, const QPicture & picture )
  • 29 public functions inherited from QObject

Additional Inherited Members

  • 1 property inherited from QObject
  • 1 public slot inherited from QObject
  • 1 signal inherited from QObject
  • 5 static public members inherited from QObject
  • 7 protected functions inherited from QObject

Detailed Description

The QPictureFormatPlugin class provides an abstract base for custom picture format plugins.

The picture format plugin is a simple plugin interface that makes it easy to create custom picture formats that can be used transparently by applications.

Writing an picture format plugin is achieved by subclassing this base class, reimplementing the pure virtual functions keys(), loadPicture(), savePicture(), and installIOHandler(), and exporting the class with the Q_EXPORT_PLUGIN2() macro.

See also How to Create Qt Plugins.

Member Function Documentation

QPictureFormatPlugin::QPictureFormatPlugin ( QObject * parent = 0 )

Constructs an picture format plugin with the given parent. This is invoked automatically by the Q_EXPORT_PLUGIN2() macro.

QPictureFormatPlugin::~QPictureFormatPlugin ()

Destroys the picture format plugin.

You never have to call this explicitly. Qt destroys a plugin automatically when it is no longer used.

bool QPictureFormatPlugin::installIOHandler ( const QString & format ) [pure virtual]

Installs a QPictureIO(obsolete) picture I/O handler for the picture format format.

See also keys().

QStringList QPictureFormatPlugin::keys () const [pure virtual]

Returns the list of picture formats this plugin supports.

See also installIOHandler().

bool QPictureFormatPlugin::loadPicture ( const QString & format, const QString & fileName, QPicture * picture ) [virtual]

Loads the picture stored in the file called fileName, with the given format, into *picture. Returns true on success; otherwise returns false.

See also savePicture().

bool QPictureFormatPlugin::savePicture ( const QString & format, const QString & fileName, const QPicture & picture ) [virtual]

Saves the given picture into the file called fileName, using the specified format. Returns true on success; otherwise returns false.

See also loadPicture().

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