Thursday, August 20, 2009

Creating Windows Event Log Entries with Scripting


LOGEVENT (type, ID, message, target, source)


$=LogEvent(4, 1, “This is just a user-defined event”, “”, “CustomEvent”)

$=LogEvent(1, 1, “Login script failed on client @wksta”, @LSERVER, “KixTart”)

Limitations:  You can only write to the Application log.
Advantages: You can invoke this without having elevated permissions.  You can submit events to remote computers (if permissions allow)

Windows Vista/7: EVENTCREATE

EVENTCREATE [/S system [/U username [/P [password]]]] /ID eventid
            [/L logname] [/SO srcname] /T type /D description


EVENTCREATE /T ERROR /ID 100  /L APPLICATION /D "This is just a user-defined event"

EVENTCREATE /S Server123 /T ERROR /L APPLICATION /D “This is a custom event”

Limitations: It must be invoked with administrative permissions.  It requires the command shell, which is minimal overhead.
Advantages: Can write to all of the event logs (System, Application, etc.).  It can write to local and remote event logs (if permissions allow)


object.LogEvent(intType, strMessage [,strTarget])


Set objShell = CreateObject(“Wscript.Shell”)
cn = objShell.ExpandEnvironmentStrings(“%computername%”)
objShell.LogEvent 1, “This is a custom ERROR message”
objShell.LogEvent 1, “Error on computer “ & cn, “MyServer”

Limitations: It can only write to the Application log
Advantages: Compared to the other options available: none.

PowerShell: WriteEntry

$evtLog = New-Object –type System.Diagnostics.Eventlog –argumentlist Application
$evtLog.Source = “Custom Event”
$evtLog.WriteEntry(“This is a custom Error even”, “Error”)

$cn = [environment]::GetEnvironmentVariable(“computername”)
$evtLog = New-Object –type System.Diagnostics.Eventlog –argumentlist Application, MyServer
$evtLog.Source = $cn
$evtLog.WriteEntry(“Error occurred on $cn”, “Error”)

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