用vc++6.0编程，实现对移动小车的键盘控制

void CCGViewView::OnKeycontrol()
{
  BootMode = BootMode_Key; //键盘控制
 process_state = ROBOT_STOP;
}

void CCGViewView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
 if(BootMode == BootMode_Key)  //用键盘控制
 {
  if(nChar == VK_UP)
  {
   process_state = ROBOT_DIRECT_MOVE;      
  }
  else if(nChar == VK_DOWN)
  {
   process_state = ROBOT_INDIRECT_MOVE;    
  }
  else if(nChar == VK_LEFT)
  {
   process_state = ROBOT_SWIRL_MOVE;
  }
  else if(nChar== VK_RIGHT)
  {
      process_state = ROBOT_INSWIRL_MOVE;     
  }
 } 
 CView::OnKeyDown(nChar, nRepCnt, nFlags);
}

void CCGViewView::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags)
{
 if(BootMode == BootMode_Key)  //用键盘控制
 {
  if(nChar == VK_UP || nChar ==VK_DOWN || nChar == VK_LEFT || nChar == VK_RIGHT)
      process_state = ROBOT_STOP;
 } 
 
 CView::OnKeyUp(nChar, nRepCnt, nFlags);
}

//处理键盘控制消息
BOOL CCGViewView::PreTranslateMessage(MSG* pMsg)
{
 // TODO: Add your specialized code here and/or call the base class
 if( pMsg-> message==WM_KEYDOWN)
 { 
      SendMessage(WM_KEYDOWN,pMsg-> wParam,0);
 }
   if(pMsg->message == WM_KEYUP)
 {
      SendMessage(WM_KEYUP,pMsg->wParam,0);
 }
 return CView::PreTranslateMessage(pMsg);
}

运行之后，按下键盘，小车不动，哪位大侠指导问题出在哪里呢？