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把鼠标限制在窗口内

玩魔兽和LOL时注意到即时游戏窗口最小化,鼠标仍限制在窗口内,这具体是怎么实现的呢?

 

Msdn上有个例子

Confining a Cursor:

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RECT rcClip;           // new area for ClipCursor
RECT rcOldClip;        // previous area for ClipCursor
  
// Record the area in which the cursor can move.
  
GetClipCursor(&rcOldClip);
  
// Get the dimensions of the application‘s window.
  
GetWindowRect(hwnd, &rcClip);
  
// Confine the cursor to the application‘s window.
  
ClipCursor(&rcClip);
  
   //
   // Process input from the confined cursor.
   //
  
// Restore the cursor to its previous area.
  
ClipCursor(&rcOldClip);