如何在不同的QT线程中创建一个窗口？ [英] How do I create a Window in different QT threads?

问题描述

我有一个应用程序，其中每个线程（除了主线程）需要创建自己的窗口。我尝试创建一个线程，然后在运行函数中调用 this-> exec（）但是，我得到一个错误，在我甚至得到的调用之前： QWidget中的ASSERT失败：Widget必须在GUI线程中创建。

I have an application in which each thread (except the main thread) needs to create its own window. I tried creating a thread and then calling this->exec() in the run function. However, I get an error before I even get to that call: ASSERT failure in QWidget: "Widgets must be created in the GUI thread."

我想弹出一个消息窗口。问题是，源有多个线程，每个线程可能需要弹出自己的消息。

I want to popup a message window. The problem is that the source has multiple threads each of which may need to popup its own message.

推荐答案

QWidget（或一些其他gui组件）在不同的（非主）线程，你可以这样实现它：

If you need to create QWidget(or some other gui component(s)) in different(non-main) thread(s) you can implement it in such way:

• 创建保存gui组件的简单包装器：

• Create simple wrapper which holds gui component:

// gui component holder which will be moved to main thread
class gui_launcher : public QObject
{
  QWidget *w;
  // other components
  //..
public:
  virtual bool event( QEvent *ev )
  {   
    if( ev->type() == QEvent::User )
    {
      w = new QWidget;
      w->show();
      return true;
    }
    return false;
  }
};

在主线程中创建QApplication对象

create QApplication object in main thread

另一个主题：

..
  // create holder
  gui_launcher gl;
  // move it to main thread
  gl.moveToThread( QApplication::instance()->thread() );
  // send it event which will be posted from main thread
  QCoreApplication::postEvent( &gl, new QEvent( QEvent::User ) );
..

很高兴，：）

be happy, :)

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