DIFXAPILOGCALLBACK callback function
Starting in Windows 10 Version 1607 (Redstone 1), the Driver Install Frameworks (DIFx) tools are no longer included in the WDK.
For more information, see DIFx Guidelines.
A DIFXAPILOGCALLBACK-typed function is an application-supplied callback function that an application registers with DIFxAPI by calling DIFXAPISetLogCallback. DIFxAPI calls the callback function to log events that occur during DIFxAPI operation.
Syntax
DIFXAPILOGCALLBACK DI_FX_API_Log_Callback;
void __cdecl DI_FX_API_Log_Callback(
DIFXAPI_LOG EventType,
DWORD Error,
PCTSTR EventDescription,
PVOID CallbackContext
)
{ ... }
Parameters
EventType
A DIFXAPI_LOG-typed enumerator that indicates the event type. The DIFXAPI_LOG enumeration is defined as follows:
typedef enum {
DIFXAPI_SUCCESS,
DIFXAPI_INFO,
DIFXAPI_WARNING,
DIFXAPI_ERROR
} DIFXAPI_LOG;
The enumeration values represent the event types that are listed in the following table.
| Value | Event type |
|---|---|
| DIFXAPI_SUCCESS | A success event that logs a message that indicates an operation succeeded. |
| DIFXAPI_INFO | An information event that logs a message that describes the context or progress of an operation. |
| DIFXAPI_WARNING | A warning event that logs a message about a possible problem that is not a fatal error. |
| DIFXAPI_ERROR | An error event that logs a message about a fatal error. |
Error
A DWORD value that specifies a Microsoft Win32 error code that is associated with an event, if one exists; otherwise, Error is zero.
EventDescription
A pointer to a NULL-terminated string that describes the event.
CallbackContext
A pointer to the callback context that a caller set for the callback function.
Return value
None
Remarks
To register a DIFxAPI log callback function, an application calls DIFXAPISetLogCallback and supplies a pointer to an application-supplied DIFXAPILOGCALLBACK-typed function and a pointer to an optional application-specific callback context.
Requirements
| Target platform | Desktop |
| Header | Difxapi.h (include Difxapi.h) |