Qt5线程编程1

Qt 5 provides multiple methods for creating and using threads. You can choose between high-level methods and low-level ones.

High-level methods are much easier to get started, but are limited in what you can do with them.

Low-level methods, on the other hand, are more flexible, but not beginner-friendly.

Qt5提供了高级和低级线程编程方式。

首先，做一个高级的方式。

头文件

#include <QFuture>
#include <QtConcurrent/QtConcurrent>
#include <QFutureWatcher>
#include <QThread>
#include <QDebug>

在main.cpp添加代码

#include "mainwindow.h"
#include <QApplication>

#include <QtOpenGL>

#include <QFuture>
#include <QtConcurrent/QtConcurrent>
#include <QFutureWatcher>
#include <QThread>
#include <QDebug>

void printText(QString text, int count)
{
    for(int i=0; i<count; ++i)
        qDebug() << text << QThread::currentThreadId();
    qDebug() << text << " Done";
}


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
//    QOpenGLWindow window;
//    window.setTitle("Hello World! OpenGL and Qt5");
//    window.resize(640, 480);
//    window.show();

    //
    QFuture<void> f1 = QtConcurrent::run(printText, QString("A"), 100);
    QFuture<void> f2 = QtConcurrent::run(printText, QString("B"), 100);
    QFuture<void> f3 = QtConcurrent::run(printText, QString("C"), 100);

    QFutureWatcher<void> futureWatcher;
    QObject::connect(&futureWatcher, QFutureWatcher<void>::finished, &w, MainWindow::mySlot);
    futureWatcher.setFuture(f1);

    f1.waitForFinished();
    f2.waitForFinished();
    f3.waitForFinished();

    return a.exec();
}

运行结果如下：

多谢，亲爱的美美。

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