主程序
1 新建一個類(PlugInterface),裏面有一組純虛的接口函數(只有純虛函數);
2 在這個類後加上Q_DECLARE_INTERFACE宏;宏的第一個參數爲PlugInterface類名
3 在主程序中需要的地方用QPluginLoader加載plugins;
4 執行plugin裏的函數。
plugin實現
1 聲明一個plugin的類(PluginInstance),它繼承QObject和主程序的接口類PlugInterface;
2 在該類中使用Q_OBJECT和Q_INTERFACES宏;Q_INTERFACES的參數爲PlugInterface
3 在PluginInstance實現結束後(PluginInstance.cpp最後)用Q_EXPORT_PLUGIN2導出;Q_EXPORT_PLUGIN2的第二個參數爲類名PluginInstance
程序代碼
#ifndef PLUGINTERFACE_H
#define PLUGINTERFACE_H
#include <QtPlugin>
class PlugInterface
{
public:
virtual void testPlugin() = 0;
};
Q_DECLARE_INTERFACE(PlugInterface, "com.trolltech.PlugAndPaint.BrushInterface/1.0");
#endif // PLUGINTERFACE_H
// pluginterface.cpp
// none
// main.cpp
#include <QtGui/QApplication>
#include <QtCore>
#include "mainwindow.h"
#include "pluginterface.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
qDebug() << "begin";
QPluginLoader loader("D:/Qt/2010.05/PluginInterface-build-desktop/debug/PluginInterface.dll");
QObject *aaa = loader.instance();
if (aaa)
{
qDebug() << "aaa";
PlugInterface *bbb = qobject_cast<PlugInterface *>(aaa);
bbb->testPlugin();
}
MainWindow w;
w.show();
qDebug() << "end";
return a.exec();
}
// plugininstance.h
#ifndef PLUGININSTANCE_H
#define PLUGININSTANCE_H
#include "pluginterface.h"
#include <QObject>
class PluginInstance : public QObject, public PlugInterface
{
Q_OBJECT
Q_INTERFACES(PlugInterface)
public:
PluginInstance();
void testPlugin();
};
#endif // PLUGININSTANCE_H
// plugininstance.cpp
#include "plugininstance.h"
#include <QtCore>
PluginInstance::PluginInstance()
{
}
void PluginInstance::testPlugin()
{
qDebug() << "test";
}
Q_EXPORT_PLUGIN2("PluginInstance", PluginInstance)