QPictureFormatPlugin Class

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

头文件:	#include <QPictureFormatPlugin>
qmake:	QT += gui
基类:	QObject

This class is obsolete.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

所有的成员列表, 包括继承的成员

公有函数

	QPictureFormatPlugin(QObject *parent = Q_NULLPTR)
	~QPictureFormatPlugin()
virtual bool	installIOHandler(const QString &format) = 0
virtual bool	loadPicture(const QString &format, const QString &fileName, QPicture *picture)
virtual bool	savePicture(const QString &format, const QString &fileName, const QPicture &picture)

32 个公有函数继承自 QObject

其他继承的成员

1 个属性继承自 QObject
1 个公有槽函数继承自 QObject
2 个信号继承自 QObject
1 个公有变量继承自 QObject
10 个静态公有成员继承自 QObject
9 个受保护的函数继承自 QObject
2 个受保护的变量继承自 QObject

详细描述

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 loadPicture(), savePicture(), and installIOHandler(), and exporting the class with the Q_PLUGIN_METADATA() macro.

The json file containing the metadata should contain one entry with the list of picture formats supported by the plugin:


  { "Keys": [ "mypictureformat" ] }

参见 How to Create Qt Plugins.

成员函数

QPictureFormatPlugin::QPictureFormatPlugin(QObject **parent* = Q_NULLPTR)

Constructs an picture format plugin with the given parent. This is invoked automatically by the moc generated code that exports the plugin.

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.

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

Installs a QPictureIO picture I/O handler for the picture format format. Returns true on success.

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

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

参见 savePicture().

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

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

参见 loadPicture().

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