GetOldestEventLogRecord function (winbase.h)

Retrieves the absolute record number of the oldest record in the specified event log.

Syntax

BOOL GetOldestEventLogRecord(
  [in]  HANDLE hEventLog,
  [out] PDWORD OldestRecord
);

[in] hEventLog

A handle to the open event log. The OpenEventLog or OpenBackupEventLog function returns this handle.

[out] OldestRecord

A pointer to a variable that receives the absolute record number of the oldest record in the specified event log.

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 oldest record in an event log is not necessarily record number 1. For more information, see Event Log Records.

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-l1-1-1 (introduced in Windows 10, version 10.0.10240)