NdisWriteEventLogEntry function

NdisWriteEventLogEntry logs an event to the Win32 event log.


NDIS_STATUS NdisWriteEventLogEntry(
  _In_     PVOID       LogHandle,
  _In_     NDIS_STATUS EventCode,
  _In_     ULONG       UniqueEventValue,
  _In_     USHORT      NumStrings,
  _In_opt_ PVOID       StringsList,
  _In_     ULONG       DataSize,
  _In_opt_ PVOID       Data


LogHandle [in]

Pointer to the driver object of the protocol that is logging this event.

EventCode [in]

Specifies the NDIS_STATUS_XXX code describing the event.

UniqueEventValue [in]

Identifies this instance of the error message.

NumStrings [in]

Specifies the number of pointers to Unicode strings in the optional StringsList. If StringsList is NULL, NumStrings must be zero.

StringsList [in, optional]

Either NULL or points to buffered Unicode strings. These strings, which describe the event, are inserted into the Win32 event log and can be examined with the Win32 event viewer. Each string must be a NUL-terminated Unicode string.

DataSize [in]

Specifies the number of bytes in the buffer for the binary data at Data . If Data is NULL, DataSize must be zero.

Data [in, optional]

Either NULL or points to buffered binary dump data that is useful for understanding the event. This data can be examined with the Win32 event viewer.

Return value

NdisWriteEventLogEntry can return one of the following values:

Return codeDescription

The event was successfully logged.


The optionally supplied Unicode strings and binary dump data exceed the maximum-allowed size (MAX_EVENT_LOG_DATA_SIZE).


NDIS was unable to allocate memory for the I/O error log record.



NdisWriteEventLogEntry allocates an I/O error log record, fills in the record with the supplied information about the event, and then writes the record to the I/O error log file. A user can view the logged event, including an optional description of the event and/or optional binary dump data, with the Win32 event viewer.

The NT error-logging thread uses any strings supplied in the optional StringsList to fill in messages written into the Win32 event log. Each string must be a NUL-terminated Unicode string. The I/O manager assumes that the initial string is either the name of the driver reporting the error or the name of the device that caused the error.

The Unicode strings supplied by the caller should be read from the registry or should be language-independent (that is, the strings should be the same in any language -- for example, the string could be a file name).

Caller-supplied dump data can be any binary data (such as register values) that is useful in understanding the event. The caller does not have to pad the binary data. If necessary, NdisWriteEventLogEntry pads the binary dump data so that the final data size is a multiple integral of sizeof(ULONG).

The system limits the total size of the optional data supplied to NdisWriteEventLogEntry. The combined size of the strings list and the (possibly padded) binary dump must be less than or equal to MAX_EVENT_LOG_DATA_SIZE.

NdisWriteEventLogEntry is called only by protocol drivers. Miniport drivers should call NdisWriteErrorLogEntry to log events and errors.


Target platform



Supported for NDIS 6.0 and NDIS 5.1 drivers (see NdisWriteEventLogEntry (NDIS 5.1)) in Windows Vista. Supported for NDIS 5.1 drivers (see NdisWriteEventLogEntry (NDIS 5.1)) in Windows XP.


Ndis.h (include Ndis.h)





DDI compliance rules


See also




Send comments about this topic to Microsoft