BOOL CSetupDlg::CheckDir(CString FileDir){
	BOOL bDir=FALSE;
	
	DWORD dwAttr=GetFileAttributes(FileDir);
	if(dwAttr == 0xffffffff){
		DWORD dwError = GetLastError();
		CString ErrorMessage;
		if(dwError == ERROR_FILE_NOT_FOUND){
			ErrorMessage=_T("file not found");
		}
		else if(dwError == ERROR_PATH_NOT_FOUND){
			ErrorMessage=_T(" path not found");
		}
		else if(dwError == ERROR_ACCESS_DENIED){
			ErrorMessage=_T(" file or directory exists, but access is denied");
		}
		else{
			ErrorMessage=_T("some other error has occured");
		}
		
		MessageBox(ErrorMessage,_T("妳輸入的資料錯誤"),MB_OK);
	}else{
		if(dwAttr & FILE_ATTRIBUTE_DIRECTORY) {
			// this is a directory
			bDir=TRUE;
		}else{
			// this is an ordinary file
			MessageBox(_T("請選擇圖片目錄"),_T("注意"),MB_OK);
		}
	}
	return bDir;
}