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.
#include <comdef.h>
Compiler COM Support Class Overview
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. |
END Microsoft Specific