QT的信号与槽机制介绍

　　//tsignal.h...class TsignalApp:public QMainWindow{Q_OBJECT...//信号声明区signals: //声明信号mySignal()void mySignal();//声明信号mySignal(int)void mySignal(int x);//声明信号mySignalParam(int,int)void mySignalParam(int x,int y);//槽声明区public slots: //声明槽函数mySlot()void mySlot();//声明槽函数mySlot(int)void mySlot(int x);//声明槽函数mySignalParam (int，int)void mySignalParam(int x,int y);}...//tsignal.cpp...TsignalApp::TsignalApp(){...//将信号mySignal()与槽mySlot()相关联connect(this,SIGNAL(mySignal()),SLOT(mySlot())); //将信号mySignal(int)与槽mySlot(int)相关联connect(this,SIGNAL(mySignal(int)),SLOT(mySlot(int))); //将信号mySignalParam(int,int)与槽mySlotParam(int,int)相关联connect(this,SIGNAL(mySignalParam(int,int)),SLOT(mySlotParam(int,int))); }// 定义槽函数mySlot()void TsignalApp::mySlot(){QMessageBox::about(this,'Tsignal', 'This is a signal/slot sample without parameter.');}// 定义槽函数mySlot(int)void TsignalApp::mySlot(int x){QMessageBox::about(this,'Tsignal', 'This is a signal/slot sample with one parameter.');}// 定义槽函数mySlotParam(int,int)void TsignalApp::mySlotParam(int x,int y){char s[256];sprintf(s,'x:%d y:%d',x,y);QMessageBox::about(this,'Tsignal', s);}void TsignalApp::slotFileNew(){//发射信号mySignal()emit mySignal();//发射信号mySignal(int)emit mySignal(5);//发射信号mySignalParam(5，100)emit mySignalParam(5,100);}