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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| advapi32.lib
| Header File
| winbase.h
| Unicode
| WinNT
| Platform Notes
| None
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ReadEventLog
The ReadEventLog function reads a whole number of entries from the specified event log. The
function can be used to read log entries in forward or reverse chronological
order.
BOOL ReadEventLog(
HANDLE hEventLog,
| // handle of event log
| DWORD dwReadFlags,
| // specifies how to read log
| DWORD dwRecordOffset,
| // number of first record
| LPVOID lpBuffer,
| // address of buffer for read data
| DWORD nNumberOfBytesToRead,
| // number of bytes to read
| DWORD *pnBytesRead,
| // number of bytes read
| DWORD *pnMinNumberOfBytesNeeded
| // number of bytes required for next record
| );
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Parameters
hEventLog
Identifies the event log to read. This handle is returned by the OpenEventLog function.
dwReadFlags
Specifies how the read operation is to proceed. This parameter can be any
combination of the following values:
Value
| Meaning
| EVENTLOG_FORWARDS_READ
| The log is read in forward chronological order.
| EVENTLOG_BACKWARDS_READ
| The log is read in reverse chronological order.
| EVENTLOG_SEEK_READ
| The read operation proceeds from the record specified by the dwRecordOffset parameter. If this flag is used, dwReadFlags must also specify EVENTLOG_FORWARDS_READ or EVENTLOG_BACKWARDS_READ. If the
buffer is large enough, more than one record can be read at the specified seek
position; the additional flag indicates the direction for successive read
operations.
| EVENTLOG_SEQUENTIAL_READ
| The read operation proceeds sequentially from the last call to the ReadEventLog function using this handle.
|
dwRecordOffset
Specifies the log-entry record number at which the read operation should
start. This parameter is ignored unless the dwReadFlags parameter includes the EVENTLOG_SEEK_READ flag.
lpBuffer
Points to a buffer for the data read from the event log. This parameter cannot
be NULL, even if the nNumberOfBytesToRead parameter is zero.
The buffer will be filled with an EVENTLOGRECORD structure.
nNumberOfBytesToRead
Specifies the size, in bytes, of the buffer. This function will read as many
whole log entries as will fit in the buffer; the function will not return
partial entries, even if there is room in the buffer.
pnBytesRead
Points to a variable that receives the number of bytes read by the function.
pnMinNumberOfBytesNeeded
Points to a variable that receives the number of bytes required for the next
log entry. This count is valid only if ReadEventLog returns zero and GetLastError returns ERROR_INSUFFICIENT_BUFFER.
Return Values
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.
Remarks
When this function returns, the read position in the error log is adjusted by
the number of records read. Only a whole number of event log records will be
returned.
Note The configured filename for this source may also be the configured filename
for other sources (several sources can exist as subkeys under a single
logfile). Therefore, this function may return events that were logged by more than one
source.
See Also
ClearEventLog, CloseEventLog, EVENTLOGRECORD, OpenEventLog, ReportEvent
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