Qt自定义信号槽

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//signal_slot.h

#ifndef SIGNAL_SLOT_H#define SIGNAL_SLOT_H#include <QtGui/QMainWindow>#include "ui_signal_slot.h"class signal_slot : public QMainWindow{Q_OBJECTpublic:signal_slot(QWidget *parent = 0, Qt::WFlags flags = 0);~signal_slot();private:Ui::signal_slotClass ui;public slots:void recieve(QString str);};class sender : public QObject{Q_OBJECTsignals:void send(QString str);public:void sendMessage(QString message);};#endif // SIGNAL_SLOT_H

//signal_slot.cpp

#include "signal_slot.h"signal_slot::signal_slot(QWidget *parent, Qt::WFlags flags): QMainWindow(parent, flags){ui.setupUi(this);}signal_slot::~signal_slot(){}void signal_slot::recieve(QString str){ui.lineEdit->setText(str);}void sender::sendMessage(QString message){emit send(message);}

//main.cpp

#include "signal_slot.h"#include <QtGui/QApplication>int main(int argc, char *argv[]){QApplication a(argc, argv);signal_slot w;sender s;w.show();QObject::connect(&s,SIGNAL(send(QString)),&w,SLOT(recieve(QString)));s.sendMessage("hello");return a.exec();}