基于对话框的程序，如何区分按钮的down 和 up消息？？

[Jack_128]

同标题！

[livedeal]

BOOL CXXXXDlg::PreTranslateMessage(MSG* pMsg)
{
// TODO: Add your specialized code here and/or call the base class
if( pMsg->message>=WM_KEYDOWN && pMsg->message<=WM_KEYUP)
{
this->SendMessage(pMsg->message,pMsg->wParam,pMsg->lParam);
return TRUE;
}
else
return CDialog::PreTranslateMessage(pMsg);
}
void CXXXXZDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
switch(nChar)
{
case VK_LEFT:
break;
case VK_RIGHT:
break;
case VK_UP:
break;
case VK_DOWN:
break;
default:
break;
}

CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}