格式化HRESULT获取对应文本

CString CXXUtil::FormatMessageFor(HRESULT hr)
{
    CString strMsg;
    LPVOID pvMsgBuf = NULL;
    LPCTSTR pszMsg = NULL;
    if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL, (DWORD)hr, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &pvMsgBuf, 0, NULL ))
    {
        pszMsg = (LPTSTR)pvMsgBuf;
        // Do something with the error message.
        //printf( "Windows error: 0X%.8X (%s)
", a_hResult, a_pszMsg );
        strMsg.Format(_T("0X%.8X (%s)"), hr, pszMsg);
        LocalFree(pvMsgBuf);
    }
    return strMsg;
}