使用 QNetworkAccessManager.get,我如何决定中止?

发布于 2024-08-20 15:25:03 字数 661 浏览 3 评论 0原文

我正在尝试使用 QT QNetworkAccessManager 类来管理多线程 C++/QT 应用程序中的一些下载。

在工作线程上(编辑:除了下载之外,该线程由于其他原因是独立的),我想访问外部服务器并准备好接收代码结果:

...
m_nam = new QNetworkAccessManager(this);
QNetworkReply *reply = m_nam->get(request);
connect(m_nam, SIGNAL(finished(QNetworkReply *)), this, 
        SIGNAL(finished(QNetworkReply *)));
...

但在下载完成之前,我可能会决定我对结果不感兴趣。

因此,我想设置一种方法,通过发出信号 do_abort() 来断开与另一个线程的连接。

其本身的含义是:

connect(this, SIGNAL(do_abort()), reply, SLOT(abort()));

但我认为这不会起作用,因为 abort 不是 QNetworkReply 的插槽。

那么如何设置一种机制来阻止另一个线程的下载呢?我可以子类化 QNetworkReply 并为该类提供适当的插槽。但我也想了解一下情况。

I am attempting to use the QT QNetworkAccessManager class to manage some downloads in a multi-threaded C++/QT application.

On worker thread (edit: the thread is seperate for other reasons aside from doing the download), I'm would like to do a get to an external server and be ready to receive the results with the code:

...
m_nam = new QNetworkAccessManager(this);
QNetworkReply *reply = m_nam->get(request);
connect(m_nam, SIGNAL(finished(QNetworkReply *)), this, 
        SIGNAL(finished(QNetworkReply *)));
...

But I might decide, before the download is finished, that I'm not interested in the result.

So I'd like to set up a way to disconnect the connection from another thread by emitting a signal do_abort().

What suggests itself is:

connect(this, SIGNAL(do_abort()), reply, SLOT(abort()));

But I don't think that will work because abort is not slot of QNetworkReply.

So how can I set a mechanism where I can stop this download from another thread? I could subclass QNetworkReply and give that class the appropriate slot. But I'd like to understand the situation also.

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花开柳相依 2024-08-27 15:25:03

使用 QNetworkAccessManager 不需要工作线程。它是异步的,因此可以从主线程使用它。

在 QThread 中,您实现 abortTheReply() 槽,并在其中执行 m_reply->abort()。然后将 do_abort() 信号连接到 abortTheReply()。

You do not need a worker thread for using QNetworkAccessManager. It is asynchronous, so it is OK to use it from your main thread.

In the QThread you implement a abortTheReply() slot and inside that you do m_reply->abort(). Then you connect your do_abort() signal to the abortTheReply().

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