The latest version of this topic can be found at _com_error::GUID.
Microsoft Specific**
Calls IErrorInfo::GetGUID function.
Syntax
GUID GUID( ) const throw( );
Return Value
Returns the result of IErrorInfo::GetGUID for the IErrorInfo object recorded within the _com_error object. If no IErrorInfo object is recorded, it returns GUID_NULL.
Remarks
Any failure while calling the IErrorInfo::GetGUID method is ignored.
END Microsoft Specific