I was writing one GUI program on Microsoft Powershell, One of the requirement was logs (Information, Warnings and Errors) must be written under Event Log - Event Viewer, So troubleshooting or information viewing for program operations is easy and everything is logged properly. To fulfill the task there is a PowerShell cmdlet Write-EventLog can be used, but while running the command it was generating the below error.
Write-Eventlog –LogName Application –Source 'My-App' –EntryType Error –EventID 10999 -Message 'This is test error. Please Ignore' Write-Eventlog : The source name "My-App" does not exist on computer "localhost". At line:1 char:1 + Write-Eventlog –LogName Application –Source 'My-App' –EntryType Error ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [Write-EventLog], InvalidOperationException + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteEventLogCommand
This error is generating because I am using my custom source name My-App and it is was not registered or created. Before creating new source event with New-EventLog Make sure you have opened Windows PowerShell as an Administrator. Once new source is registered, I checked writing log with Write-EventLog again, this time it was successful with no output to show on screen.
New-EventLog –LogName Application –Source 'My-App' Write-Eventlog –LogName Application –Source 'My-App' –EntryType Error –EventID 10999 -Message 'This is test error. Please Ignore'
To verify and check the newly written event log open Event Viewer and verify log is written successfully, You can perform the same task with PowerShell using below command.
Get-EventLog -LogName Application -Newest 5 -EntryType Error -InstanceId 10999
If you want to us .net object with PowerShell to substitute New-EventLog, you can use as below.
[System.Diagnostics.EventLog]::CreateEventSource("My-App", "Application")
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