键盘输入& Win32消息循环 [英] Keyboard Input & the Win32 message loop

问题描述

如何处理Windows消息循环中的按键和键事件？我需要能够调用两个函数 OnKeyUp（char c）; 和 OnKeyDown（char c）; 。 / p>

我从googling发现的当前文献导致我对WM_CHAR或WM_KEYUP和WM_KEYDOWN混淆，通常针对PDA或托管代码，而我使用C ++ 。

解决方案

使用 char c = MapVirtualKey（param，MAPVK_VK_TO_CHAR）; 将虚拟键代码转换为char，并处理WM_KEYUP和WM_KEYDOWN及其wParams。

  if（PeekMessage（& mssg，hwnd ，0，0，PM_REMOVE））
 {
 switch（mssg.message）
 {
 case WM_QUIT：
 PostQuitMessage（0）; 
 notdone = false; 
 quit = true; 
 break; 
 
 case WM_KEYDOWN：
 WPARAM param = mssg.wParam; 
 char c = MapVirtualKey（param，MAPVK_VK_TO_CHAR）; 
 this-> p-> Input（） - > Keyboard（） - > Listeners（） - > OnKeyDown（c）; 
 break; 
 
 case WM_KEYUP：
 WPARAM param = mssg.wParam; 
 char c = MapVirtualKey（param，MAPVK_VK_TO_CHAR）; 
 this-> p-> Input（） - > Keyboard（） - > Listeners（） - > OnKeyUp（c）; 
 break; 
} 
 //分派消息
 TranslateMessage（& mssg）; 
 DispatchMessage（& mssg）; 
} 
  

How do I handle key presses and key up events in the windows message loop? I need to be able to call two functions OnKeyUp(char c); and OnKeyDown(char c);.

Current literature I've found from googling has lead me to confusion over WM_CHAR or WM_KEYUP and WM_KEYDOWN, and is normally targeted at PDA or Managed code, whereas I'm using C++.

解决方案

Use char c = MapVirtualKey(param,MAPVK_VK_TO_CHAR); to convert virtual key codes to char, and process WM_KEYUP and WM_KEYDOWN and their wParams.

if (PeekMessage (&mssg, hwnd, 0, 0, PM_REMOVE))
{
    switch (mssg.message)
    {
        case WM_QUIT:
            PostQuitMessage (0);
            notdone = false;
            quit = true;
            break;

        case WM_KEYDOWN:
            WPARAM param = mssg.wParam;
            char c = MapVirtualKey (param, MAPVK_VK_TO_CHAR);
            this->p->Input ()->Keyboard ()->Listeners ()->OnKeyDown (c);
            break;

        case WM_KEYUP:
            WPARAM param = mssg.wParam;
            char c = MapVirtualKey (param, MAPVK_VK_TO_CHAR);
            this->p->Input ()->Keyboard ()->Listeners ()->OnKeyUp (c);
            break;
    }
    // dispatch the message
    TranslateMessage (&mssg);
    DispatchMessage (&mssg);
}

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