ClearEventLogA function (winbase.h)

Clears the specified event log, and optionally saves the current copy of the log to a backup file.


BOOL ClearEventLogA(
  [in] HANDLE hEventLog,
  [in] LPCSTR lpBackupFileName


[in] hEventLog

A handle to the event log to be cleared. The OpenEventLog function returns this handle.

[in] lpBackupFileName

The absolute or relative path of the backup file. If this file already exists, the function fails.

If the lpBackupFileName parameter is NULL, the event log is not backed up.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError. The ClearEventLog function can fail if the event log is empty or the backup file already exists.


After this function returns, any handles that reference the cleared event log cannot be used to read the log.


The winbase.h header defines ClearEventLog as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.


Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header winbase.h (include Windows.h)
Library Advapi32.lib
DLL Advapi32.dll
API set ext-ms-win-advapi32-eventlog-ansi-l1-1-0 (introduced in Windows 10, version 10.0.10240)

See also

Event Logging Functions