DoEvents等同于C ++？ [英] DoEvents equivalent for C++?

问题描述

我是本地c ++的新手。现在，我按下鼠标左键时，它有一个for循环，执行InvalidateRect并绘制一个矩形，并且每次迭代时增加X的框大小。但是，C ++在绘制时比C＃快得多，效率高，它立即绘制所有这些。我想要的是它使矩形无效，显示矩形，等待50ms，然后继续循环。我尝试睡眠（50），但它仍然等待，直到绘画完成后才显示结果。我也试过PeekMessage，但它没有改变任何东西。
任何帮助将不胜感激。感谢

I'm new to native c++. Right now, I made it so when I press the left mouse button, it has a for loop that does InvalidateRect and draws a rectangle, and increments X by the box size each time it iterates. But, C++ is so much faster and efficient at drawing than C# that, it draws all this instantly. What I would like is for it to invalidate the rectangle, show the rectangle, wait 50ms, then continue the loop. I tried Sleep(50) but it still waits until painting is done before showing the result. I also tried PeekMessage but it did not change anything. Any help would be appreciated. Thanks

推荐答案

DoEvents基本上翻译为：

DoEvents basically translates as:

void DoEvents()
{
    MSG msg;
    BOOL result;

    while ( ::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE ) )
    {
        result = ::GetMessage(&msg, NULL, 0, 0);
        if (result == 0) // WM_QUIT
        {                
            ::PostQuitMessage(msg.wParam);
            break;
        }
        else if (result == -1)
        {
             // Handle errors/exit application, etc.
        }
        else 
        {
            ::TranslateMessage(&msg);
            :: DispatchMessage(&msg);
        }
    }
}

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