GetLogIoStatistics function (clfsw32.h)

Retrieves log I/O statistics for a dedicated or multiplexed log that is associated with the specified handle. This function queries Common Log File System (CLFS) for specific types of log I/O statistics. Calling this function on a multiplexed log only associates the statistics with the underlying log.


  [in]            HANDLE             hLog,
  [in, out]       PVOID              pvStatsBuffer,
  [in]            ULONG              cbStatsBuffer,
  [in]            CLFS_IOSTATS_CLASS eStatsClass,
  [out, optional] PULONG             pcbStatsWritten


[in] hLog

A handle to an open log file that CreateLogFile gets. The log handle can refer to either a dedicated or multiplexed log file.

[in, out] pvStatsBuffer

A pointer to a buffer to receive the I/O statistics.

This buffer must be at least as large as an I/O statistics packet header. For more information, see CLFS_IO_STATISTICS_HEADER.

[in] cbStatsBuffer

The size of the I/O statistics buffer pvStatsBuffer, in bytes.

If the buffer is not large enough for the statistics packet, the function fails with ERROR_MORE_DATA.

[in] eStatsClass

This parameter is not implemented at this time; it is reserved for future use.

[out, optional] pcbStatsWritten

A pointer to a variable to receive the size of the I/O statistics packet that is written to pvStatsBuffer.

This value is less than or equal to cbStatsBuffer.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero (0). To get extended error information, call GetLastError. The following list identifies the possible error codes:


Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2003 R2 [desktop apps only]
Target Platform Windows
Header clfsw32.h
Library Clfsw32.lib
DLL Clfsw32.dll

See also



Common Log File System Functions