C++ _com_error::Description方法代码示例

void Workshare::Logging::LogDebugResult(LPCTSTR fileName, int lineNumber, LPCTSTR function, const _com_error& comError)
{
	try
	{
		if(ShouldLogDebug())
		{
			CString outputMessage;
			outputMessage.Format(_T("Com Exception:\r\nDetails: 0x%08x - %s"), comError.Error(), (LPCTSTR)comError.Description());
	
			Logger::GetInstance().LogDebug(fileName, lineNumber, function, outputMessage, ::GetCurrentThreadId(), GetModuleName());
		}
	}
	catch(...)
	{
		::OutputDebugString(L"Error: failed to create DEBUG log message for _com_error.");
	}
}

void CDBAdo::RecordErrorMsg(_com_error comError)
{
	_bstr_t	bstrDescribe(comError.Description());

	m_strErrorMsg.Format(TEXT("ADO 错误：0x%8x，%s"), comError.Error(), (LPCTSTR)bstrDescribe);
}

void PrintErrorInfo(_com_error e)
{
	wprintf(L"错误源：%s\n", (wchar_t*)e.Source());
	wprintf(L"错误信息：%s；HResult：0x%x\n", e.ErrorMessage(), e.Error());
	wprintf(L"错误描述：%s\n", (wchar_t*)e.Description());
}

void show_error(_com_error &e)
{
    printf("(0x%08X)\n\r",e.Error());
    PrintLine("");
    printf("%s\n\r",(char*)e.Description());
}

void CMktStructureBaseDlg::ErrorMessage (const _com_error & e)
{
	StatusMessage ( e.ErrorInfo() ? (LPCTSTR) e.Description() : e.ErrorMessage()  );
}

//*****************************************************************************
//* Function Name: HandleFacilityInternetComErrorException
//*   Description: Special handling for errors with a facility of
//*                FACILITY_INTERNET.
//*****************************************************************************
static bool HandleFacilityInternetComErrorException (const _com_error&	p_ce)

{
	bool l_bHandled = false;

	// In nearly all cases that I have observed so far,
	// when the failure HRESULT has a facility of FACILITY_INTERNET,
	// the Description/ErrorMessage is just a generic string
	// containing the error code rather than a meaningful description.
	// However, the corresponding description is often available in the
	// MESSAGETABLE resource of one of the system DLLs associated with
	// internet functionality. Therefore, try to look up the error code
	// in these system DLLs. If the lookup is successful then set new rich
	// error information. In addition, we set the Source and GUID properties
	// of the rich error information according to the active COM method's
	// CLSID and IID.

	try {
		// We are only interested in FACILITY_INTERNET.
		if (HRESULT_FACILITY (p_ce.Error ()) != FACILITY_INTERNET) {
			return false;
		}

		_bstr_t l_sbstrDescription = p_ce.Description ();

		// We are not interested if we already have non-empty rich error
		// information descriptive text.
		if (l_sbstrDescription.length () > 0) {
			return false;
		}

		LPCTSTR l_lpszErrorMessage = p_ce.ErrorMessage();

		// We are not interested unless the system error message begins
		// with "Unknown error".
		if (l_lpszErrorMessage != NULL) {
			static const TCHAR UNKNOWN_ERROR[] = _T("Unknown error");
			if (_tcsnicmp (l_lpszErrorMessage, UNKNOWN_ERROR, _tcslen (UNKNOWN_ERROR)) != 0) {
				return false;
			}
		}

		// If we get to here, then there is no description and no error message.
		// Let's try to lookup the error code in the MESSAGETABLE resources of
		// a few system DLLs in order to try to find a decent error message.

		static LPCTSTR s_rglpszDLLs[] = {
			_T("urlmon.dll"),
			_T("wininet.dll"),
			_T("winhttp.dll"),
			_T("msxml3r.dll")
		};
		static UINT s_uNumDLLs = sizeof (s_rglpszDLLs) / sizeof (*s_rglpszDLLs);

		bool l_bFound = false;
		TCHAR l_szDescription[256] = {0};

		l_bFound =  LookupErrorCode (	p_ce.Error (),
										s_rglpszDLLs,
										s_uNumDLLs,
										l_szDescription,
										256);

		if (!l_bFound) {

			l_bFound =  LookupErrorCode (	HRESULT_CODE (p_ce.Error ()),
											s_rglpszDLLs,
											s_uNumDLLs,
											l_szDescription,
											256);
		}

		if (l_bFound) {

			CLSID	l_clsid = GUID_NULL;
			IID		l_iid   = GUID_NULL;

			CActiveMethodGUIDs::Get (l_clsid, l_iid);

			USES_CONVERSION;
			HRESULT l_hr;

			// Create and populate a standard error object.
			ICreateErrorInfoPtr l_spCreateErrorInfo;
			l_hr = ::CreateErrorInfo (&l_spCreateErrorInfo);
			if (FAILED (l_hr)) _com_issue_error (l_hr);

			// Set the Description property.
			l_hr = l_spCreateErrorInfo->SetDescription (T2OLE (l_szDescription));
			if (FAILED (l_hr)) _com_issue_error (l_hr);

			// Get the ProgID corresponding to rclsid.
			LPOLESTR l_lpoleszProgID = NULL;
			l_hr = ::ProgIDFromCLSID (l_clsid, &l_lpoleszProgID);
			if (FAILED (l_hr)) _com_issue_error (l_hr);
//.........这里部分代码省略.........