25.QT进度条

 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
 #include <QMainWindow>
 5 #include <QProgressBar>
 
 namespace Ui {
 class MainWindow;
 }
 
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
 
 public:
     explicit MainWindow(QWidget *parent = );
     ~MainWindow();
 
 private slots:
     void on_pushButton_clicked();
 
 private:
     Ui::MainWindow *ui;
     QProgressBar *process;
 };
 
 #endif // MAINWINDOW_H

 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include <windows.h>
 
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::MainWindow)
 {
     ui->setupUi(this);
 
11     process = new QProgressBar(this);
12     process->resize(300,100);
13     process->move(50,50);
 }
 
 MainWindow::~MainWindow()
 {
     delete ui;
 }
 
 void MainWindow::on_pushButton_clicked()
 {
     process->setRange(,);
24     for(int i=0;i<=100;i++)
25     {
26         process->setValue(i);
27         Sleep(30);
28     }
 }