修改按键的回调钩子函数

修改按键回调钩子函数，经过一天的查资料，终于解决了按键按下和按键弹起时响应两次的问题。

 

 

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
 KBDLLHOOKSTRUCT* pStruct = (KBDLLHOOKSTRUCT*)lParam;
 
 if (nCode == HC_ACTION)
 {  
      
  if (pStruct->vkCode == *g_lpdwVirtualKey)  
  { 
   switch(wParam)
   {
   
   case WM_KEYDOWN:
    keybd_event('B',0,0,0);
    keybd_event('B',0,KEYEVENTF_KEYUP,0);
    return TRUE;
   
   case WM_KEYUP: 
    return TRUE;
   
   case WM_SYSKEYDOWN: 
    return TRUE; 
  
   case WM_SYSKEYUP:
    return TRUE;
  
   }
  
  }
 }
 return CallNextHookEx(g_hHook, nCode, wParam, lParam);
}