VB and VBA Users Source Code: Writing to the NT event log
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VB/VBA Source Code
Writing to the NT event log
By:
Andrew Baker
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Date:
Sunday, January 18, 2004
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2416
Category:
Windows API
Article:
Below is the basic outline of a class that can be used to write data to the Windows event log. An example of how to use this class is included at the bottom of this post. ----Add this to a class called "clsEventLog" 'Copyright 2005 www.vbusers.com 'Event log writer class. 'Written by Andrew Baker 'For the Terms and conditions see http://www.vbusers.com/about.asp Option Explicit Private zsSource As String Private Declare Function RegisterEventSource Lib "advapi32.dll" Alias "RegisterEventSourceA" (ByVal lpUNCServerName As String, ByVal lpSourceName As String) As Long Private Declare Function DeregisterEventSource Lib "advapi32.dll" (ByVal hEventLog As Long) As Long Private Declare Function ReportEvent Lib "advapi32.dll" Alias "ReportEventA" (ByVal hEventLog As Long, ByVal wType As Long, ByVal wCategory As Long, ByVal dwEventID As Long, lpUserSid As Any, ByVal wNumStrings As Long, ByVal dwDataSize As Long, lpStrings As String, lpRawData As Any) As Long Private Declare Function GetLastError Lib "kernel32" () As Long Private Declare Function OpenEventLog Lib "advapi32.dll" Alias "OpenEventLogA" (ByVal lpUNCServerName As String, ByVal lpSourceName As String) As Long Private Declare Function CloseEventLog Lib "advapi32.dll" (ByVal hEventLog As Long) As Long Private Declare Function BackupEventLog Lib "advapi32.dll" Alias "BackupEventLogA" (ByVal hEventLog As Long, ByVal lpBackupFileName As String) As Long Private Declare Function ClearEventLog Lib "advapi32.dll" Alias "ClearEventLogA" (ByVal hEventLog As Long, ByVal lpBackupFileName As String) As Long Private Declare Function GetNumberOfEventLogRecords Lib "advapi32.dll" (ByVal hEventLog As Long, NumberOfRecords As Long) As Long Private Declare Function GetOldestEventLogRecord Lib "advapi32.dll" (ByVal hEventLog As Long, OldestRecord As Long) As Long Private Type EVENTLOGRECORD Length As Long ' Length of full record Reserved As Long ' Used by the service RecordNumber As Long ' Absolute record number TimeGenerated As Long ' Seconds since 1-1-1970 TimeWritten As Long 'Seconds since 1-1-1970 EventID As Long EventType As Integer NumStrings As Integer EventCategory As Integer ReservedFlags As Integer ' For use with paired events (auditing) ClosingRecordNumber As Long 'For use with paired events (auditing) StringOffset As Long ' Offset from beginning of record UserSidLength As Long UserSidOffset As Long DataLength As Long DataOffset As Long ' Offset from beginning of record End Type Public Enum eEventLogType EVENTLOG_SUCCESS = 0 EVENTLOG_ERROR_TYPE = 1 EVENTLOG_WARNING_TYPE = 2 EVENTLOG_INFORMATION_TYPE = 4 EVENTLOG_AUDIT_SUCCESS = 8 EVENTLOG_AUDIT_FAILURE = 10 End Enum Property Get Source() As String Source = zsSource End Property Property Let Source(Value As String) zsSource = Value End Property Function Log(sTitle As String, sMessage As String, eLogType As eEventLogType) As Boolean Dim lLenMessage As Long Dim lhwndEventLog As Long lhwndEventLog = RegisterEventSource("", zsSource) lLenMessage = Len(sTitle) + 1 'Write the event in the application event log If ReportEvent(lhwndEventLog, eLogType, 0, 1, ByVal 0&, 1, 0, sMessage, ByVal 0&) = 0 Then 'Failed Log = False Else 'Success Log = True End If If lhwndEventLog Then DeregisterEventSource lhwndEventLog End If End Function Private Sub Class_Initialize() zsSource = "VB Event Log" End Sub Sub ViewLog() Shell "eventvwr.exe", vbNormalFocus End Sub ----Add this to a standard module Option Explicit 'Example code Sub TestLog() Dim oEventLog As clsEventLog Set oEventLog = New clsEventLog oEventLog.Source = "Andrew Test" oEventLog.Log "TEST", "TEST MESSAGE", EVENTLOG_ERROR_TYPE End Sub
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