Qt学习例子1——HelloWorld

这个工程是在VS2008下建的

 

//Helloworld.h

 

#ifndef HELLOWORLD_H

#define HELLOWORLD_H

 

#include <QtGui/QMainWindow>

#include "ui_helloworld.h"

 

class HelloWorld : public QMainWindow

{

    Q_OBJECT

 

public:

    HelloWorld(QWidget *parent = 0, Qt::WFlags flags = 0);

    ~HelloWorld();

 

private:

    Ui::HelloWorldClass ui;

};

 

#endif // HELLOWORLD_H

 

//helloworld.cpp

#include "helloworld.h"

 

HelloWorld::HelloWorld(QWidget *parent, Qt::WFlags flags)

    : QMainWindow(parent, flags)

{

    ui.setupUi(this);

}

 

HelloWorld::~HelloWorld()

{

 

}

 

//main.cpp

#include "helloworld.h"

#include <QtGui/QApplication>

 

#include <QtGui/QLabel>

#include <QtGui/QPushButton>

 

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

{

    QApplication a(argc, argv);

//  HelloWorld w;

//  w.show();

    QPushButton b("Close All");

    b.show();

    QObject::connect(&b, SIGNAL(clicked()), &a, SLOT(quit()));

 

    QLabel l("Hello,world!");

//  l.setAlignment(Qt::Alignment());

    l.setAlignment(Qt::AlignCenter);

 

    l.show();

    return a.exec();

}

 

运行的效果如下：