Qt里通过传递函数指针实现动态绑定信号/槽

// test.h

#include <QObject>

class QTimer;

class Test:public QObject

{

Q_OBJECT

public:

    Test(QObject * parent = 0);

    ~Test();

    void startTimer(int interval);

    void connectQTimer(void(Test::*pf)());

public slots:

    void onTimeout();

    void onPrintOut();

private:

    QTimer *m_timer;

};

#endif // TEST

// test.cpp

#include <QTimer>

#include <QDebug>

#include "test.h"

Test::Test(QObject *parent)

    : QObject(parent)

{

    m_timer = new QTimer(this);

}

Test::~Test()

{

    m_timer->deleteLater();

    m_timer = NULL;

}

void Test::startTimer(int interval)

{

    m_timer->start(interval);

    //    timer->setSingleShot(true);

}

void Test::connectQTimer(void (Test::*pf)())

{

    connect(m_timer, &QTimer::timeout, this, pf);

    // 失败方法1

//    connect(m_timer, SIGNAL(timeout()),this, SLOT(pf));

    // 失败方法2

//    connect(m_timer, SIGNAL(timeout()),this, SLOT(*pf));

    // 失败方法3

//    connect(m_timer, SIGNAL(timeout()),this, SLOT((this->*pf)()));

}

void Test::onTimeout()

{

    qDebug()<<"onTimeout()called...\n";

}

void Test::onPrintOut()

{

    qDebug()<<"onPrintOut()called...\n";

}

// main.cpp

#include <QCoreApplication>

#include <QTimer>

#include "test.h"

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    Test test;

    /*** 第一种方式传递函数指针 ***/

    test.connectQTimer(&Test::onTimeout);

    test.connectQTimer(&Test::onPrintOut);

    /*** 第二种方式传递函数指针 ***/

//    void(Test::*pf)() = &Test::onTimeout;

//    test.connectQTimer(pf);

//    void(Test::*pp)() = &Test::onPrintOut;

//    test.connectQTimer(pp);

    test.startTimer(5000);

    return a.exec();

}