DoEvents 等效于 C++?

问题描述

我是本机 C++ 的新手.现在，我做到了，当我按下鼠标左键时，它有一个 for 循环，它执行 InvalidateRect 并绘制一个矩形，并在每次迭代时按框大小增加 X.但是，C++ 的绘图速度和效率比 C# 快得多，它可以立即绘制所有这些.我想要的是它使矩形无效，显示矩形，等待 50 毫秒，然后继续循环.我试过 Sleep(50) 但它仍然等到绘画完成后再显示结果.我也试过 PeekMessage 但它没有改变任何东西.任何帮助，将不胜感激.谢谢

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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