我应该使用DirectInput还是Windows消息循环？

问题描述

我正在使用C ++ DirectX 2D游戏，我需要键盘和鼠标输入。

维基百科说：

使用它？

我有一个GameScreen类，它负责绘图和更新（游戏逻辑），我在窗口消息循环中调用Draw和Update方法。

感谢

解决方案

泵为了有一个窗口，你可以使用那个泵来处理键盘和鼠标输入以及。这完全取决于您的泵是否将键盘事件传送到子窗口，如果您愿意，您可以在泵中处理它们。

您的典型消息泵看起来像这样：

  while（GetMessage（& msg，NULL，0，0））
 {
 if （WM_QUIT = msg.message）
 break; 
 TranslateMessage（& msg）; // post一个WM_CHAR消息，如果这是一个WM_KEYDOWN 
 DispatchMessage（& msg）; // this messages messages to the msg.hwnd 
} 
  

可能看起来更像这样

  while（true）
 {
 if（PeekMessage（& msg， NULL，0，0，PM_REMOVE | PM_NOYIELD））
 {
 bool fHandled = false; 
 if（msg.message> = WM_MOUSEFIRST&& msg.message< = WM_MOUSELAST）
 fHandled = MyHandleMouseEvent（& msg）; 
 else if（msg.message> = WM_KEYFIRST&& msg.message< = WM_KEYLAST）
 fHandled = MyHandleKeyEvent（& msg）; 
 else if（WM_QUIT == msg.message）
 break; 
 
 if（！fHandled）
 {
 TranslateMessage（& msg）; 
 DispatchMessage（& msg）; 
} 
} 
 else 
 {
 //如果现在没有更多的消息要处理，请做一些
 //游戏切片处理。 
 // 
} 
} 
  

泵可能甚至比这更复杂，可能与 MsgWaitForMultipleObjects ，使您可以定期醒来，即使没有消息要处理，但立即有消息时。 / p>

I'm working on a C++ DirectX 2D game and I need keyboard and mouse input.
Wikipedia says:

So how should I use it?
I have a GameScreen class whice take care of the drawing and the updating(game logic), I call the Draw and the Update methods inside a windows message loop.

Thanks

解决方案

Since you pretty much have to run a message pump in order to have a window, you might as well use that pump to handle keyboard and mouse input as well. It's entirely up to your pump whether you hand keyboard events on to a child window, you can handle them in the pump if you prefer.

Your typical message pump looks like this:

while (GetMessage(&msg, NULL, 0, 0))
{
    if (WM_QUIT == msg.message)
       break;
    TranslateMessage(&msg); // post a WM_CHAR message if this is a WM_KEYDOWN
    DispatchMessage(&msg);  // this sends messages to the msg.hwnd
}

For a game, your pump might look more like this

while (true)
{
   if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE | PM_NOYIELD))
   {
      bool fHandled = false;
      if (msg.message >= WM_MOUSEFIRST && msg.message <= WM_MOUSELAST)
         fHandled = MyHandleMouseEvent(&msg);
      else if (msg.message >= WM_KEYFIRST && msg.message <= WM_KEYLAST)
         fHandled = MyHandleKeyEvent(&msg);
      else if (WM_QUIT == msg.message)
         break;

      if ( ! fHandled)
      {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
      }
   }
   else
   {
       // if there are no more messages to handle right now, do some
       // game slice processing.
       //
   }
}

Of course, your actual pump will likely be even more complex than that, possibly with a MsgWaitForMultipleObjects so that you can wake periodically even if there a no messages to process, but immediatelly when there are messages.

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