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Standard COM Errors

Many, but not all, of the properties and methods of the Commerce Server objects use standard Component Object Model (COM) HRESULT return values to communicate whether the operation was successful or not.

In C++, these values are the actual return values from the methods themselves (including property get_ and put_ methods). The program must explicitly perform error checking by examining these return values, or use some variation of structured error handling.

In Microsoft Visual Basic (VB), and in Visual Basic Scripting Edition (VBS) as used in Active Server Pages (ASP), these values are placed in the Number property of the global Err object. Error handling is either handled automatically, displaying a standard error dialog box, or explicitly by the program, checking the value of the Number property of the global Err object. The On Error Resume Next command disables automatic error handling, thereby enabling explicit error handling.

The following table shows the most common standard COM errors returned by the properties and methods of the Commerce Server objects.

Constant Value (32-bit) Description
S_OK 00000000 The standard return value used to communicate successful completion.
S_FALSE 00000001 An alternate success value, typically used to communicate successful, but non-standard completion. The precise meaning depends on the method or property in question.
E_UNEXPECTED 8000FFFF Catastrophic failure error.
E_NOTIMPL 80004001 Not implemented error.
E_OUTOFMEMORY 8007000E Out of memory error.
E_INVALIDARG 80070057 One or more arguments are not valid error.
E_NOINTERFACE 80004002 Interface not supported error.
E_POINTER 80004003 Pointer not valid error.
E_HANDLE 80070006 Handle not valid error.
E_ABORT 80004004 Operation aborted error.
E_FAIL 80004005 Unspecified error.
E_ACCESSDENIED 80070005 General access denied error.

Additional information may be available using the global Err object. In Visual Basic, the Description property of the Err object may contain a text description of the error.

In C++, call the API function GetErrorInfo to retrieve the most recently set IErrorInfo pointer in the current logical thread. The GetDescription method of that interface may return a text description of the error.


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