connect使用函數指針，帶參數的時候優先考慮使用static_cast

栗子一：

運行截圖如下：

源碼如下：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include <QProcess>namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private slots:void on_pushButton_clicked();void getProcessStatus(int exitCode,QProcess::ExitStatus exitStatus);private:Ui::Widget *ui; };#endif // WIDGET_H

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include <QDebug> #include <QEvent> #include <QMessageBox>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this); }Widget::~Widget() {delete ui; }void Widget::on_pushButton_clicked() {QProcess p;QString cmdString="E:\\vs2012\\QtTestDemo\\Debug\\QtTestDemo.exe";p.start("cmd",QStringList()<<"/c"<<cmdString);QEventLoop loop;//connect(&p,static_cast<void(QProcess::*)(int,QProcess::ExitStatus)>(&QProcess::finished),this,&Widget::getProcessStatus);connect(&p,static_cast<void(QProcess::*)(int,QProcess::ExitStatus)>(&QProcess::finished),[=](int exitCode,QProcess::ExitStatus exitStatus){qDebug()<<"exitCode:"<<exitCode;qDebug()<<"QProcess::ExitStatus:"<<exitStatus;});connect(&p,SIGNAL(finished(int,QProcess::ExitStatus)),&loop,SLOT(quit()));loop.exec();QString getStr=QString(p.readAllStandardOutput());QMessageBox::information(this,"提示",getStr); }void Widget::getProcessStatus(int exitCode, QProcess::ExitStatus exitStatus) {qDebug()<<"exitCode:"<<exitCode;qDebug()<<"exitStatus:"<<exitStatus; }

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栗子二

運行截圖如下：

源碼如下：

qtconnectdemo.h

#ifndef QTCONNECTDEMO_H #define QTCONNECTDEMO_H#include <QtWidgets/QWidget> #include "ui_qtconnectdemo.h"class QtConnectDemo : public QWidget {Q_OBJECTpublic:QtConnectDemo(QWidget *parent = 0);~QtConnectDemo();public slots://void btnClicked();void btnClicked(bool checked);private:Ui::QtConnectDemoClass ui; };#endif // QTCONNECTDEMO_H

mian.cpp

#include "qtconnectdemo.h" #include <QtWidgets/QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);QtConnectDemo w;w.show();return a.exec(); }

qtconnectdemo.cpp

#include "qtconnectdemo.h" #include "ui_qtconnectdemo.h" #include <QDebug>QtConnectDemo::QtConnectDemo(QWidget *parent): QWidget(parent) {ui.setupUi(this);//connect(ui.pushButton,SIGNAL(clicked()),this,SLOT(btnClicked()));//connect(ui.pushButton,&QPushButton::clicked,this,&QtConnectDemo::btnClicked);//connect(ui.pushButton,&QPushButton::clicked,this,&QtConnectDemo::btnClicked);connect(ui.pushButton,static_cast<void(QPushButton::*)(bool)>(&QPushButton::clicked),[=](bool status){qDebug()<<status;}); }QtConnectDemo::~QtConnectDemo() {}//void QtConnectDemo::btnClicked() //{ // qDebug()<<"btnClicked() called!"; //}void QtConnectDemo::btnClicked(bool checked) {qDebug()<<"checked status:"<<checked;qDebug()<<"btnClicked(bool checked) called!"; }

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