Using Macros for Error Handling
There are several macros for making it easier to work with HRESULT values.
There are two sets of macros that test for failure or success: HR_SUCCEEDED and HR_FAILED and SUCCEEDED and FAILED. SUCCEEDED is the same as HR_SUCCEEDED and FAILED is the same as HR_FAILED.
In this case, use the ResultFromScode macro to set the HRESULT variable to the corresponding HRESULT value for S_OK.
Commonly used macros are briefly described in the following table.
| Macro | Description |
|---|---|
|
MAKE_HRESULT |
Constructs an HRESULT from its components. |
|
HR_SUCCEEDED |
Tests an HRESULT for a success or warning condition. |
|
HR_FAILED |
Tests an HRESULT for an error condition. |
|
HRESULT_CODE |
Extracts the error code part of the HRESULT. |
|
HRESULT_FACILITY |
Extracts the facility from the HRESULT. |
|
HRESULT_SEVERITY |
Extracts the severity bit from the SEVERITY. |
|
SUCCEEDED |
Tests an HRESULT for a success or warning condition. |
|
FAILED |
Tests an HRESULT for an error condition. |
