//代码就不加注释了 一看就懂的了 ^_^ 

BOOL CXXXXXXXXDlg::PreTranslateMessage(LPMSG lpmsg)

{
          BOOL bHandleNow = FALSE;

 switch (lpmsg->message)
 {
 case WM_KEYDOWN:
         switch (lpmsg->wParam)
        {
         case VK_F1:
           {
                // for F1 popup help documents follow language option 
                TCHAR szFilePath[MAX_PATH];
                memset(szFilePath,0x00,MAX_PATH);
                GetModuleFileName(NULL, szFilePath, MAX_PATH); 
                (_tcsrchr(szFilePath, _T('\\')))[1] = 0;

               TCHAR szPath[256];
                // show the manual by the language ID
                lstrcpy(szPath, _T("help.pdf"));
    
                wcscat_s(szFilePath,szPath);
                if(PathFileExists(szFilePath))
                {
                     ShellExecute(NULL,_T("open"),szFilePath,NULL,NULL,SW_SHOW);
                     return TRUE;
                }
           }
           break;
  }
  break;  
 }

 return __super::PreTranslateMessage(lpmsg);
}

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