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接口類頭文件 MyPluginInterface.h
[cpp] view plain copy
#ifndef INTERFACES_H
#define INTERFACES_H
#include <QtPlugin>
#define QtPluginDemo_iid "org.qt-project.Qt.PluginDemo"
class MyPluginInterface
{
public:
virtual int add(int,int) = 0 ; // 正確寫法
// virtual int add(int,int); // 不太妥的寫法(雖然這也是正確的虛函數(shù)聲明語句)
// 注:接口類中的虛函數(shù)都應(yīng)有實體,或設(shè)置為0(推薦),這樣
// C++的編譯器才能為接口類生成虛函數(shù)表。否則,如果沒有實現(xiàn)
// 接口類的虛函數(shù)也沒有將其設(shè)為0,程序在在鏈接時可能會失敗,
// 或者鏈接成功但最后生成的庫無法加載(庫中有未定義的符號)
};
Q_DECLARE_INTERFACE ( MyPluginInterface, QtPluginDemo_iid ) ;
#endif
插件頭文件 MyPlugin.h
[cpp] view plain copy
#ifndef MYPLUGIN__H
#define MYPLUGIN__H
#include <QObject>
#include <QDebug>
#include "MyPluginInterface.h"
class MyPlugin : public QObject, public MyPluginInterface
{
Q_OBJECT
Q_PLUGIN_METADATA ( IID QtPluginDemo_iid FILE "MyPlugin.json")
Q_INTERFACES(MyPluginInterface)
public:
int add(int,int);
};
#endif
插件源文件 MyPlugin.cpp
[cpp] view plain copy
#include "MyPlugin.h"
int MyPlugin::add(int a , int b)
{
return a+b ;
}
#include "moc_MyPlugin.cpp"
JSON文件 MyPlugin.json,本示例中該文件是空的。
工程文件 MyPlugin.pro
[cpp] view plain copy
TEMPLATE = lib
CONFIG += plugin console
QT += core
HEADERS = MyPlugin.h MyPluginInterface.h
SOURCES = MyPlugin.cpp
OTHER_FILES = MyPlugin.json
TARGET = MyPlugin
DESTDIR = ./
INCLUDEPATH += ./
# install
target.path = ./install
INSTALLS += target
接口類頭文件 MyPluginInterface.h,該文件與插件代碼中的一致。
主程序文件 main.cpp
[cpp] view plain copy
#include "MyPluginInterface.h"
#include <QtPlugin>
#include <QApplication>
#include <QWidget>
#include <QPluginLoader>
#include <QString>
#include <QtDebug>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget w;
QObject* object ;
w.show();
app.addLibraryPath(QString("../MyPlugin/install")); // 添加庫路徑
// 加載插件,取得實例
QPluginLoader l(QString("MyPlugin")) ;
//QPluginLoader l(QString("libMyPlugin.so")) ;
if ( (object=l.instance()) != NULL )
{
qDebug("plugin loaded .");
// 使用插件
int a = 14 , b = 23 ;
MyPluginInterface* plugin = qobject_cast<MyPluginInterface*>(object) ;
if (plugin)
qDebug("%d + %d = %d",a,b,plugin->add(a,b));
}
else
{
qDebug("failed to load plugin !! ");
QString errorStr = l.errorString();
qDebug()<<errorStr;
}
return app.exec();
}
MyApp.pro
[cpp] view plain copy
######################################################################
# Automatically generated by qmake (3.0) ?? 11? 19 02:26:33 2014
######################################################################
TEMPLATE = app
QT += gui core widgets
CONFIG += console
TARGET = MyApp
INCLUDEPATH += .
# Input
HEADERS += MyPluginInterface.h
SOURCES += main.cpp
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