Code Example for Working with ADSI Error Messages

CString GetErrorMessage( HRESULT hr )
{
	BOOL bRet;
	CString s;
	LPTSTR lpBuffer=NULL;
 
	if ( SUCCEEDED(hr) )
	{
		return _T("Success");
}
 

	if ( hr & 0x00005000) // standard ADSI Errors 
	{
		s = GetADSIError(hr);
}
	else if ( HRESULT_FACILITY(hr)==FACILITY_WIN32 )
	{
 
 
		/////////////////////////////////////////////
		// Retrieve the Win32 Error message
		/////////////////////////////////////////////
 
		bRet = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 
							 FORMAT_MESSAGE_FROM_SYSTEM,
							 NULL,  hr,
							 MAKELANGID(LANG_NEUTRAL, 
							 SUBLANG_SYS_DEFAULT),
							 (LPTSTR) &lpBuffer, 0, NULL);
 
		if ( !bRet )
		{
			s.Format(_T("Error %ld"), hr );
	}
 
		if ( lpBuffer )
		{
			s = lpBuffer;
			LocalFree( lpBuffer );
	}
}
	else // Non Win32 Error
	{
		s.Format("%X", hr );
		return s;
}
 
	//////////////////////////////////////////////////////////////////
	//
	// Extended error message may be returned. 
	//
	// IADs, IADsContainer, IDirectoryObject or IDirectorySearch may 
	// return this extended error message
	//
	/////////////////////////////////////////////////////////////////
	WCHAR szBuffer[MAX_PATH];
	WCHAR szName[MAX_PATH];
	DWORD dwError;

 
	hr = ADsGetLastError( &dwError, szBuffer, (sizeof(szBuffer)/sizeof(WCHAR))-1,
						szName, (sizeof(szName)/sizeof(WCHAR))-1 );
 

	if ( SUCCEEDED(hr) && dwError != ERROR_INVALID_DATA  && 
									 wcslen(szBuffer))
	{
		USES_CONVERSION;
		s += _T("  -- Extended Error --- ");
		s += OLE2T(szName);
		s += _T(" : ");
		s += OLE2T( szBuffer );
}
 
 
	return s;
}
 
 
typedef struct tagADSERRMSG
{
	HRESULT	hr;
	LPCTSTR	pszError;
}ADSERRMSG;
 
#define ADDADSERROR(x)   x, _T(#x)
 
ADSERRMSG adsErr[] = 
{
	ADDADSERROR(E_ADS_BAD_PATHNAME),
	ADDADSERROR(E_ADS_INVALID_DOMAIN_OBJECT),
	ADDADSERROR(E_ADS_INVALID_USER_OBJECT),
	ADDADSERROR(E_ADS_INVALID_COMPUTER_OBJECT),
	ADDADSERROR(E_ADS_UNKNOWN_OBJECT),
	ADDADSERROR(E_ADS_PROPERTY_NOT_SET),
	ADDADSERROR(E_ADS_PROPERTY_NOT_SUPPORTED),
	ADDADSERROR(E_ADS_PROPERTY_INVALID),
	ADDADSERROR(E_ADS_BAD_PARAMETER),
	ADDADSERROR(E_ADS_OBJECT_UNBOUND),
	ADDADSERROR(E_ADS_PROPERTY_NOT_MODIFIED),
	ADDADSERROR(E_ADS_PROPERTY_MODIFIED),
	ADDADSERROR(E_ADS_CANT_CONVERT_DATATYPE),
	ADDADSERROR(E_ADS_PROPERTY_NOT_FOUND),
	ADDADSERROR(E_ADS_OBJECT_EXISTS),
	ADDADSERROR(E_ADS_SCHEMA_VIOLATION),
	ADDADSERROR(E_ADS_COLUMN_NOT_SET),
	ADDADSERROR(E_ADS_INVALID_FILTER),
	ADDADSERROR(0),
};
 
 
/////////////////////////////////////////////
//
// Error message specific to ADSI 
//
////////////////////////////////////////////
CString GetADSIError( HRESULT hr )
{
	CString s;
 
 
	if ( hr & 0x00005000 )
	{
		int idx=0;
		while (adsErr[idx].hr != 0 )
		{
			if ( adsErr[idx].hr == hr )
			{
				return adsErr[idx].pszError;
		}
			idx++;
	}
}
 
	return _T("");
  
 
}