4_1.cpp

一个qt设计的教程

#include <qapplication.h>
#include <qwidget.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <qlcdnumber.h>
#include <qslider.h>

class MyMainWindow:public QWidget
{
 public:
    MyMainWindow();
 private:
    QPushButton *b1;
    QLCDNumber *lcd;
    QSlider *slider;
};

MyMainWindow::MyMainWindow()
{
 setGeometry(100,100,300,2000);
 
 b1 = new QPushButton("Quit",this);
 b1->setGeometry(10,10,80,40);
 b1->setFont(QFont("Times",18,QFont::Bold));

 lcd = new QLCDNumber(2,this);
 lcd->setGeometry(100,10,190,180);

 slider = new QSlider(Vertical,this);
 slider->setGeometry(10,60,80,130);

 connect(b1,SIGNAL(clicked()),qApp,SLOT(quit()));
 connect(slider,SIGNAL(valueChanged(int)),lcd,SLOT(display(int)));
}

main(int argc,char **argv)
{
 QApplication a(argc,argv);
 MyMainWindow w;

 a.setMainWidget(&w);
 w.show();
 a.exec();
}