Retrieves the operation code from the event descriptor.
- EventDescriptor [in]
Event descriptor from which to retrieve the operation code. See EVENT_DESCRIPTOR.
Operation code that identifies the operation being performed at the time the event was written.
This is a convenience macro for retrieving the member of the EVENT_DESCRIPTOR structure.
Minimum supported client
|Windows Vista [desktop apps only]|
Minimum supported server
|Windows Server 2008 [desktop apps only]|