qt 定义插件

定义的接口
----------------------------------------------
#ifndef REGEXPINTERFACE_H

#define REGEXPINTERFACE_H

#include <QString>

class RegExpInterface

{

public:

    virtual ~RegExpInterface()

    {

    }

    virtual QString regexp(const QString &message)=0;

};

Q_DECLARE_INTERFACE(RegExpInterface, "org.myplugin.RegExpInterface")

#endif // REGEXPINTERFACE_H

实现的接口的类 头文件
---------------------------------------------

#define REGEXPPLUGIN_H

#include <QObject>

#include <QString>

#include "regexpinterface.h"

class RegExpPlugin : public QObject, RegExpInterface

{

    Q_OBJECT

    Q_PLUGIN_METADATA (IID "org.myplugin.RegExpInterface")

    Q_INTERFACES(RegExpInterface)

public:

    QString regexp(const QString &message);

};

#endif // REGEXPPLUGIN_H

源文件
-------------------------------------

#include "regexpplugin.h"

QString RegExpPlugin::regexp(const QString &message)

{

    return "hello world";

}

pro 文件
-------------------------------------

HEADERS += \

    regexpplugin.h \

    regexpinterface.h

SOURCES += \

    regexpplugin.cpp

TEMPLATE=lib

CONFIG  +=plugin

TARGET =regexpplugin

测试插件的窗口

窗口的头文件
-----------------------------------------

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include "regexpinterface.h"

#include <QPluginLoader>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_pushButton_clicked();

private:

    RegExpInterface *regInterface;

    Ui::MainWindow *ui;

    bool loadPlugin();

};

#endif // MAINWINDOW_H

窗口的源文件
----------------------------------------

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

}

MainWindow::~MainWindow()

{

    delete ui;

}

bool MainWindow::loadPlugin()

{

      QPluginLoader loader("../plug/plugin.dll");

        QObject *obj= loader.instance();

        if(obj)

        {

            regInterface=qobject_cast<RegExpInterface *>(obj);

            if(regInterface)

            {

               QString str= regInterface->regexp("jjjkk");

               ui->Result->setText(str);

            }

        }

}

void MainWindow::on_pushButton_clicked()

{

    this->loadPlugin();

}

插件中常用的pri文件
------------------------------------------------

HEADERS += \

    $$PWD/common/HpQRCodeInterface.h

PROJECT_COMPONENTSOURCE = $$PWD/common

PLUGIN_INSTALL_DIRS = $$[QT_INSTALL_LIBS]/ukui-demo-plugin