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The latest version of this topic can be found at _com_error::HelpContext.

Microsoft Specific**

Calls IErrorInfo::GetHelpContext function.

DWORD HelpContext( ) const throw( );  

Returns the result of IErrorInfo::GetHelpContext for the IErrorInfo object recorded within the _com_error object. If no IErrorInfo object is recorded, it returns a zero.

Any failure while calling the IErrorInfo::GetHelpContext method is ignored.

END Microsoft Specific

_com_error Class