停止由QtConcurrent :: run启动的线程? [英] Stop Thread started by QtConcurrent::run?

问题描述

是否可以通过其关联的QFuture对象停止线程? 目前，我一直在开始像这样的视频捕获过程.

Is it possible to stop a Thread by its associated QFuture Object ? Currently i've been starting a video capturing process like this.

this->cameraThreadRepresentation = QtConcurrent::run(this,&MainWindow::startLiveCapturing);

在startLiveCapturing-Method内部，一个无限循环正在运行，该循环捕获图像并显示它们.因此，如果用户要停止该过程，则只需按一个按钮，该操作就会停止. 但似乎我无法通过调用像这样的cancel方法来停止此线程?

Inside the startLiveCapturing-Method an infinite loop is running that captures images and displays them. So if the user wants to stop that process he should simply press a button and that operation stops. But it seems that i can not stop this thread by calling the cancel method like this ?

this->cameraThreadRepresentation.cancel();

我做错了什么，如何停止该线程或操作.

What i am doing wrong and how can i stop that thread or operation.

推荐答案

来自 QtConcurrent的文档:: run :

请注意，由QtConcurrent :: run()返回的QFuture不支持取消，暂停或进度报告.返回的QFuture仅可用于查询函数的运行/完成状态和返回值.

Note that the QFuture returned by QtConcurrent::run() does not support canceling, pausing, or progress reporting. The QFuture returned can only be used to query for the running/finished status and the return value of the function.

您可以做的是在主窗口中按下按钮并设置一个布尔标志，然后像下面那样构建无限循环:

What you could do is have a button press set a boolean flag in your main window and build your infinite loop like this:

_aborted = false;

forever    // Qt syntax for "while( 1 )"
{
    if( _aborted ) return;

    // do your actual work here
}

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