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_com_error Class

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Microsoft Specific

A _com_error object represents an exception condition detected by the error-handling wrapper functions in the header files generated from the type library or by one of the COM support classes. The _com_error class encapsulates the HRESULT error code and any associated IErrorInfo object.

Construction

_com_error

Constructs a _com_error object.

Operators

operator =

Assigns an existing _com_error object to another.

Extractor Functions

Error

Retrieves the HRESULT passed to the constructor.

ErrorInfo

Retrieves the IErrorInfo object passed to the constructor.

WCode

Retrieves the 16-bit error code mapped into the encapsulated HRESULT.

IErrorInfo Functions

Description

Calls IErrorInfo::GetDescription function.

HelpContext

Calls IErrorInfo::GetHelpContext function.

HelpFile

Calls IErrorInfo::GetHelpFile function

Source

Calls IErrorInfo::GetSource function.

GUID

Calls IErrorInfo::GetGUID function.

Format Message Extractor

ErrorMessage

Retrieves the string message for HRESULT stored in the _com_error object.

ExepInfo.wCode to HRESULT Mappers

HRESULTToWCode

Maps 32-bit HRESULT to 16-bit wCode.

WCodeToHRESULT

Maps 16-bit wCode to 32-bit HRESULT.

Requirements

Header: comdef.h

Lib: comsuppw.lib or comsuppwd.lib (see /Zc:wchar_t (wchar_t Is Native Type) for more information)

See Also

Concepts

Compiler COM Support Classes