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connect使用函数指针，带参数的时候优先考虑使用static_cast

栗子一：

运行截图如下：

源码如下：

widget.h

#ifndef WIDGET_H#define WIDGET_H#include 
   
    #include 
    
     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 
   
    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 
   
    #include 
    
     #include 
     
      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"<
      
       (&QProcess::finished),this,&Widget::getProcessStatus);    connect(&p,static_cast
       
        (&QProcess::finished),[=](int exitCode,QProcess::ExitStatus exitStatus){       qDebug()<<"exitCode:"<
       
      
     
    
   

栗子二

运行截图如下：

源码如下：

qtconnectdemo.h

#ifndef QTCONNECTDEMO_H#define QTCONNECTDEMO_H#include 
   
    #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 
   
    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 
   
    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
    
     (&QPushButton::clicked),[=](bool status){		qDebug()<
    
   

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