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#include <QApplication> #include <QThread> #include <QMainWindow> #include <QProgressBar> #include <QPushButton> class RenderThread : public QThread {Q_OBJECT signals:void notify(int); public:RenderThread(QObject *parent = 0): QThread(parent){};void test(){start(HighestPriority);}; protected:void run(){int i =0;while (i<101){msleep(50);i++;emit notify(i);}}; };class MainWindow : public QMainWindow {Q_OBJECTpublic:MainWindow(QWidget *parent = 0){resize(600, 400);centralWidget = new QWidget(this);progressBar = new QProgressBar(centralWidget);progressBar->setGeometry(QRect(130, 180, 321, 23));progressBar->setValue(0);pushButton = new QPushButton("test",centralWidget);pushButton->setGeometry(QRect(110, 100, 75, 23));QObject::connect(pushButton, SIGNAL(clicked()), this, SLOT(OnClicked()));this->setCentralWidget(centralWidget);};~MainWindow(){};private:QProgressBar *progressBar;QPushButton *pushButton;QWidget *centralWidget;RenderThread render; public slots:void OnClicked(){connect(&render,SIGNAL(notify(int)),this,SLOT(OnNotify(int)));render.test(); };void OnNotify(int i){progressBar->setValue(i); };}; #include "test.moc" int main(int argc,char* argv[]) {QApplication app(argc,argv);MainWindow window;window.show();return app.exec(); }