Qt多线程操作界面---在QThread更新QProgressBar

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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_OBJECT public: 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(); }