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Windows Services

tonelm54
tonelm54 asked
on
Medium Priority
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Last Modified: 2010-04-23
Ive been trying to write a windows service from the tutorial at "http://www.devarticles.com/c/a/VB.Net/Creating-A-Windows-Service-in-VB.NET/1/", I can write the code, and build correctly, even install the service, however I cannot seem to get it to do anything!

The code from the tutorial I have simplified just to see if I can see it running (see if its a problem connecting to the event viewer) so the code I currently have is:-

Public Class Service1
    Protected Overrides Sub OnStart(ByVal args() As String)
        Timer1.Enabled = True
    End Sub
    Protected Overrides Sub OnStop()
        Timer1.Enabled = False
    End Sub
    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        MsgBox("Im running")
    End Sub
End Class

But still doesnt work, does anyone have any suggestions?

I can see the service has been started in my services view!

Tony Cross
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Guy Hengel [angelIII / a3]Billing Engineer
CERTIFIED EXPERT
Most Valuable Expert 2014
Top Expert 2009

Commented:
>  MsgBox("Im running")

you will never see any interface from a service, hence the msgbox will actually "block" your service.
if you want a front-end (for example in systray), you need to develop a second application that sits in the tray and communicates with the service.

Open services, find your service and check the  : Allow service to interact with desktop, under the "Log On" tab.
And see if that makes any difference.

Author

Commented:
Ok, tried the 'interact with desktop' no luck, although I have changed my code to take that problem out.

Public Class Service1
    Protected Overrides Sub OnStart(ByVal args() As String)
        Timer1.Interval = 1
        Timer1.Enabled = True
        writefile("Service Started")
    End Sub
    Protected Overrides Sub OnStop()
        Timer1.Enabled = False
        writefile("Service Stopped")
    End Sub
    Private Sub writefile(ByVal strMessage As String)
        FileOpen(1, "c:\test.txt", OpenMode.Append)
        PrintLine(1, strMessage & " " & Now.Hour & ":" & Now.Minute & "." & Now.Millisecond)
        FileClose(1)
    End Sub
    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        writefile("Tick1 Running")
    End Sub
End Class


It creates the line 'Service Started' and 'service stopped' lines, but does not display the 'Tick1 Running', I run as a console (changing the project type in properties) and set it to console, and it works great. Any ideas?

Tony Cross

Commented:
Be sure you're using either the System.Timers.Timer or System.Threading.Timer.  The System.Windows.Forms.Timer shouldn't be used in a service.

Author

Commented:
Ok, tried this now, still get the start and end service messages, but still dont get my ticks, any ideas?

Public Class Service1
    Dim Timer1 As New System.Timers.Timer
    Protected Overrides Sub OnStart(ByVal args() As String)
        Timer1.Interval = 1
        Timer1.Enabled = True
        writefile("Service Started")
    End Sub
    Protected Overrides Sub OnStop()
        Timer1.Enabled = False
        writefile("Service Stopped")
    End Sub
    Private Sub writefile(ByVal strMessage As String)
        FileOpen(1, "c:\test.txt", OpenMode.Append)
        PrintLine(1, strMessage & " " & Now.Hour & ":" & Now.Minute & "." & Now.Millisecond)
        FileClose(1)
    End Sub
    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs)
        writefile("Tick1 Running")
    End Sub
End Class
Commented:
Put this in the OnStart:

       AddHandler Timer1.Elapsed, AddressOf Timer1_Tick

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