Hresult Return Value

The following table lists the values of common hresult values. More values are contained in the header file winerror. h.

Name	Description	Value
S_ OK	Operation successful	Zero X 00000000
E_unexpected	Unexpected failure	0x8000ffff
E_notimpl	Not Implemented	Zero X 80004001
E_outofmemory	Failed to allocate necessary memory	0x8007000e
E_invalidarg	One or more arguments are invalid	Zero X 80070057
E_nointerface	No such interface supported	Zero X 80004002
E_pointer	Invalid Pointer	Zero X 80004003
E_handle	Invalid handle	Zero X 80070006
E_abort	Operation aborted	Zero X 80004004
E_fail	Unspecified failure	Zero X 80004005
E_accessdenied	General Access Denied Error	Zero X 80070005
S_false	Operation Failure

 

Hresult is actually a dubyte value. If the highest bit (BIT) is 0, the result is successful, and 1 indicates an error. If we need to determine the return value in the program, we can use the comparison operator number, switch statement, or the macro provided by VC:

Hresult hR = call component functions; If (succeeded (HR )){...} // if it succeeds ...... if (failed (HR )){...} // if it fails