Qt多線程應用--QRunnable顯示進度條示例

進度條：

代碼如下：

#include <QtGui/QApplication>
#include <QProgressBar>  
#include <QThreadPool>
#include <QTest>
#include <QtCore>


class RunnableTask : public QRunnable
{
public:
    RunnableTask(QProgressBar* progressBar)
    {
        m_ProgressBar = progressBar;
    }

    void run()
    {
        for (int i = 1; i <= 100; i++)
        {
            QMetaObject::invokeMethod(m_ProgressBar, "setValue", Qt::QueuedConnection, Q_ARG(int, i));
            QTest::qSleep(100);  

            qDebug() << "testRunable" << i << "%  " << QThread::currentThread() << endl;
        }
    }

private:
    QProgressBar* m_ProgressBar;  
};


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QProgressBar progressBar;
    progressBar.setValue(50);  
    progressBar.show();  

    RunnableTask* task = new RunnableTask(&progressBar);
    QThreadPool::globalInstance()->start(task);

    return a.exec();
}