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ReportEvent info  Overview  Group

The ReportEvent function writes an entry at the end of the specified event log.

BOOL ReportEvent(

    HANDLE hEventLog,

// handle returned by RegisterEventSource

    WORD wType,

// event type to log

    WORD wCategory,

// event category

    DWORD dwEventID,

// event identifier

    PSID lpUserSid,

// user security identifier (optional)

    WORD wNumStrings,

// number of strings to merge with message

    DWORD dwDataSize,

// size of binary data, in bytes

    LPCTSTR *lpStrings,

// array of strings to merge with message

    LPVOID lpRawData 

// address of binary data



Identifies the event log. This handle is returned by the RegisterEventSource function.
Specifies the type of event being logged. This parameter can be one of the following values:




Error event


Warning event


Information event


Success Audit event


Failure Audit event

For more information about event types, see Event Logging.

Specifies the event category. This is source-specific information; the category can have any value.
Specifies the event identifier. The event identifier specifies the message that goes with this event as an entry in the message file associated with the event source.
Points to the current userís security identifier. This parameter can be NULL if the security identifier is not required.
Specifies the number of strings in the array pointed to by the lpStrings parameter. A value of zero indicates that no strings are present.
Specifies the number of bytes of event-specific raw (binary) data to write to the log. If this parameter is zero, no event-specific data is present.
Points to a buffer containing an array of null-terminated strings that are merged into the message before Event Viewer displays the string to the user. This parameter must be a valid pointer (or NULL), even if wNumStrings is zero. Each string has a limit of 32K bytes.
Points to the buffer containing the binary data. This parameter must be a valid pointer (or NULL), even if the dwDataSize parameter is zero.

Return Values

If the function succeeds, the return value is nonzero, indicating that the entry was written to the log.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


This function is used to log an event. The entry is written to the end of the configured logfile for the source identified by the hEventLog parameter. The ReportEvent function adds the time, the user name, the entryís length, and the offsets before storing the entry in the log.

See Also

ClearEventLog, CloseEventLog, OpenEventLog, ReadEventLog, RegisterEventSource 

file: /Techref/os/win/api/win32/func/src/f74_6.htm, 6KB, , updated: 2000/4/7 12:19, local time: 2022/5/26 01:58,

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