Service executes twice

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  • Tom Van den Brandt
    #1

    Service executes twice

    Hi,

    I wrote a simple windows service that includes a FileSystemWatch er.
    After building and installing the service (installutil) I notice that
    the service executes twice. I included a write to the application
    eventlog in OnStart ("service has started and is ready to watch the
    filesystem") and this results in two entries in the eventlog.

    Also, the handler for the FileSystemWatch er seems to be fired twice if
    something happens with a file the service is watching.

    I checked the machines services and in the task manager but I see only
    one instance of the service running.

    I'm a newbie at this, so I probably missed something obvious... Could
    this be the properties of the service that were not correctly configured?

    Any ideas?

    Thx,

    Tom
    Tags: None
    • Harry
      #2
      Re: Service executes twice

      "Tom Van den Brandt" <guineapig@guin eapig.bewrote in message
      news:uJud95IIIH A.4684@TK2MSFTN GP06.phx.gbl...
      Hi,
      >
      I wrote a simple windows service that includes a FileSystemWatch er.
      After building and installing the service (installutil) I notice that
      the service executes twice. I included a write to the application
      eventlog in OnStart ("service has started and is ready to watch the
      filesystem") and this results in two entries in the eventlog.
      >
      Also, the handler for the FileSystemWatch er seems to be fired twice if
      something happens with a file the service is watching.
      >
      I checked the machines services and in the task manager but I see only
      one instance of the service running.
      >
      I'm a newbie at this, so I probably missed something obvious... Could
      this be the properties of the service that were not correctly configured?
      >
      Any ideas?
      >
      Thx,
      >
      Tom
      Tom, often we look at code and miss that what we are trying to accomplish is
      often sabotaged by lack of observation or object/control events. Two of the
      great debugging tools I have discovered are sleep and alcohol. Without
      seeing your code, it is not possible to give advice. I have solved many
      problems just by putting the problem to bed for a while, and come back to it
      when ones' emotional state has changed. Cheers


        Comment

        • Tom Van den Brandt
          #3
          Re: Service executes twice

          Well,

          I had some sleep in the meantime...
          And this is what I came up with:
          I had the code to write to the application event log in OnStart double.
          So part of the problem is corrected. Still, the FilesSystemWatc her
          seems to fire twice. Maybe I don't understand its mechanics well enough.

          This is what I have in OnStart:

          Me.SMSFileWatch er.Path = Path
          Me.SMSFileWatch er.IncludeSubdi rectories = False
          Me.SMSFileWatch er.NotifyFilter = IO.NotifyFilter s.LastWrite
          Me.SMSFileWatch er.Filter = "freebee.jr n"
          Me.SMSFileWatch er.EnableRaisin gEvents = True
          AddHandler SMSFileWatcher. Changed, AddressOf OnChanged

          And this in OnChanged:

          My.Application. Log.WriteEntry( "An SMS has arrived!")
          send("An SMS has arrived")

          send passes the message to clients on the network...

          So, everytime I open the file, change it and save it, I have the "An SMS
          has arrived!" message twice in the Application event log.

          Am I doing this correctly?

          Thx!


          Tom


          Harry schreef:
          "Tom Van den Brandt" <guineapig@guin eapig.bewrote in message
          news:uJud95IIIH A.4684@TK2MSFTN GP06.phx.gbl...
          >Hi,
          >>
          >I wrote a simple windows service that includes a FileSystemWatch er.
          >After building and installing the service (installutil) I notice that
          >the service executes twice. I included a write to the application
          >eventlog in OnStart ("service has started and is ready to watch the
          >filesystem") and this results in two entries in the eventlog.
          >>
          >Also, the handler for the FileSystemWatch er seems to be fired twice if
          >something happens with a file the service is watching.
          >>
          >I checked the machines services and in the task manager but I see only
          >one instance of the service running.
          >>
          >I'm a newbie at this, so I probably missed something obvious... Could
          >this be the properties of the service that were not correctly configured?
          >>
          >Any ideas?
          >>
          >Thx,
          >>
          >Tom
          >
          Tom, often we look at code and miss that what we are trying to accomplish is
          often sabotaged by lack of observation or object/control events. Two of the
          great debugging tools I have discovered are sleep and alcohol. Without
          seeing your code, it is not possible to give advice. I have solved many
          problems just by putting the problem to bed for a while, and come back to it
          when ones' emotional state has changed. Cheers
          >
          >

            Comment

            • Phill W.
              #4
              Re: Service executes twice

              Tom Van den Brandt wrote:
              Still, the FilesSystemWatc her seems to fire twice.
              Maybe I don't understand its mechanics well enough.
              >
              This is what I have in OnStart:
              >
              Me.SMSFileWatch er.Path = Path
              Me.SMSFileWatch er.IncludeSubdi rectories = False
              Me.SMSFileWatch er.NotifyFilter = IO.NotifyFilter s.LastWrite
              Me.SMSFileWatch er.Filter = "freebee.jr n"
              Me.SMSFileWatch er.EnableRaisin gEvents = True
              AddHandler SMSFileWatcher. Changed, AddressOf OnChanged
              Did you declare SMSFileWatcher "WithEvents "?

              If so, VB will have /automatically/ wired-up the OnChanged Event for you
              and your AddHandler statement will simply add /another/ handler to that
              event; it won't "undo" or "replace" an existing one.
              And this in OnChanged:
              I'm not entirely sure why but, whenever I've used the FileSystemWatch er,
              I've had to allow for multiple events in rapid succession - you seem to
              get duplicate "change" events even if the file only changes once.

              HTH,
              Phill W.

                Comment

                • Tom Van den Brandt
                  #5
                  Re: Service executes twice

                  Phill W. schreef:
                  Tom Van den Brandt wrote:
                  >
                  >Still, the FilesSystemWatc her seems to fire twice.
                  > Maybe I don't understand its mechanics well enough.
                  >>
                  >This is what I have in OnStart:
                  >>
                  > Me.SMSFileWatch er.Path = Path
                  > Me.SMSFileWatch er.IncludeSubdi rectories = False
                  > Me.SMSFileWatch er.NotifyFilter = IO.NotifyFilter s.LastWrite
                  > Me.SMSFileWatch er.Filter = "freebee.jr n"
                  > Me.SMSFileWatch er.EnableRaisin gEvents = True
                  > AddHandler SMSFileWatcher. Changed, AddressOf OnChanged
                  >
                  Did you declare SMSFileWatcher "WithEvents "?
                  Even when I comment out the Addhandler line and the EnableRaisingEv ents
                  line (and put the code in OnChanged in
                  Private Sub SMSFileWatcher_ Changed
                  The code is still executed twice.

                  I'm thinking that for some reason the filewatcher is firing the event
                  twice...

                  Thx for your suggestions!
                  >
                  If so, VB will have /automatically/ wired-up the OnChanged Event for you
                  and your AddHandler statement will simply add /another/ handler to that
                  event; it won't "undo" or "replace" an existing one.
                  >
                  >And this in OnChanged:
                  >
                  I'm not entirely sure why but, whenever I've used the FileSystemWatch er,
                  I've had to allow for multiple events in rapid succession - you seem to
                  get duplicate "change" events even if the file only changes once.
                  >
                  HTH,
                  Phill W.

                    Comment

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