Opinion on how best to wait for a file

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  • john bailo
    #1

    Opinion on how best to wait for a file

    I'm writing a program to monitor the operation of a process.

    Part of the process involves trigging a method,
    then waiting for the creation of a flag file. I
    want my code to pause at that point.

    How would you recomment waiting and monitoring.
    I can think of two ways:

    0. Start a timer.
    1. Raise an event to check for File.Exists("")
    2. If File.Exists then Timer.Enabled=f alse.


    Or

    Do a while loop, with while(File.Exis ts())

    What do you guys recommend?



    Tags: None
    • Robert Jeppesen
      #2
      Re: Opinion on how best to wait for a file

      You have the added option of using a FileSystemWatch er and receive an event
      when stuff happens in 'Watched' folders. Details are in MSDN.

      --
      Robert Jeppesen
      robert.jeppesen %at%durius-dot-se


      "john bailo" <jbailo@vestcom .com> wrote in message news:775a4c308d d9257129c8fff27 5e823b2@news.te ranews.com...[color=blue]
      > I'm writing a program to monitor the operation of a process.
      >
      > Part of the process involves trigging a method,
      > then waiting for the creation of a flag file. I
      > want my code to pause at that point.
      >
      > How would you recomment waiting and monitoring.
      > I can think of two ways:
      >
      > 0. Start a timer.
      > 1. Raise an event to check for File.Exists("")
      > 2. If File.Exists then Timer.Enabled=f alse.
      >
      >
      > Or
      >
      > Do a while loop, with while(File.Exis ts())
      >
      > What do you guys recommend?
      >
      >
      >[/color]


        Comment

        • Alvin Bruney
          #3
          Re: Opinion on how best to wait for a file

          The filesystemwatch er is known to have issues because of the underlying OS
          which doesn't always notify the listener. Proceed with caution.

          "Robert Jeppesen" <robert.jeppese n(#)durius.se> wrote in message
          news:#u5fAWrjDH A.3256@tk2msftn gp13.phx.gbl...[color=blue]
          > You have the added option of using a FileSystemWatch er and receive an[/color]
          event[color=blue]
          > when stuff happens in 'Watched' folders. Details are in MSDN.
          >
          > --
          > Robert Jeppesen
          > robert.jeppesen %at%durius-dot-se
          >
          >
          > "john bailo" <jbailo@vestcom .com> wrote in message[/color]
          news:775a4c308d d9257129c8fff27 5e823b2@news.te ranews.com...[color=blue][color=green]
          > > I'm writing a program to monitor the operation of a process.
          > >
          > > Part of the process involves trigging a method,
          > > then waiting for the creation of a flag file. I
          > > want my code to pause at that point.
          > >
          > > How would you recomment waiting and monitoring.
          > > I can think of two ways:
          > >
          > > 0. Start a timer.
          > > 1. Raise an event to check for File.Exists("")
          > > 2. If File.Exists then Timer.Enabled=f alse.
          > >
          > >
          > > Or
          > >
          > > Do a while loop, with while(File.Exis ts())
          > >
          > > What do you guys recommend?
          > >
          > >
          > >[/color]
          >
          >[/color]


            Comment

            • Robert Jeppesen
              #4
              Re: Opinion on how best to wait for a file

              Yes, I heard of that pre-2003. Is this still an issue in Framework 1.1?

              --
              Robert Jeppesen
              robert.jeppesen %at%durius-dot-se


              "Alvin Bruney" <vapordan_spam_ me_not@hotmail_ no_spamhotmail. com> wrote in message news:e3hFjcrjDH A.2732@TK2MSFTN GP11.phx.gbl...[color=blue]
              > The filesystemwatch er is known to have issues because of the underlying OS
              > which doesn't always notify the listener. Proceed with caution.
              >
              > "Robert Jeppesen" <robert.jeppese n(#)durius.se> wrote in message
              > news:#u5fAWrjDH A.3256@tk2msftn gp13.phx.gbl...[color=green]
              > > You have the added option of using a FileSystemWatch er and receive an[/color]
              > event[color=green]
              > > when stuff happens in 'Watched' folders. Details are in MSDN.
              > >
              > > --
              > > Robert Jeppesen
              > > robert.jeppesen %at%durius-dot-se
              > >
              > >
              > > "john bailo" <jbailo@vestcom .com> wrote in message[/color]
              > news:775a4c308d d9257129c8fff27 5e823b2@news.te ranews.com...[color=green][color=darkred]
              > > > I'm writing a program to monitor the operation of a process.
              > > >
              > > > Part of the process involves trigging a method,
              > > > then waiting for the creation of a flag file. I
              > > > want my code to pause at that point.
              > > >
              > > > How would you recomment waiting and monitoring.
              > > > I can think of two ways:
              > > >
              > > > 0. Start a timer.
              > > > 1. Raise an event to check for File.Exists("")
              > > > 2. If File.Exists then Timer.Enabled=f alse.
              > > >
              > > >
              > > > Or
              > > >
              > > > Do a while loop, with while(File.Exis ts())
              > > >
              > > > What do you guys recommend?
              > > >
              > > >
              > > >[/color]
              > >
              > >[/color]
              >
              >[/color]


                Comment

                • Bryan Martin
                  #5
                  Re: Opinion on how best to wait for a file

                  Do a groups.google.c om search on "systemfilewatc her" namespace.

                  Bryan
                  "john bailo" <jbailo@vestcom .com> wrote in message
                  news:775a4c308d d9257129c8fff27 5e823b2@news.te ranews.com...[color=blue]
                  > I'm writing a program to monitor the operation of a process.
                  >
                  > Part of the process involves trigging a method,
                  > then waiting for the creation of a flag file. I
                  > want my code to pause at that point.
                  >
                  > How would you recomment waiting and monitoring.
                  > I can think of two ways:
                  >
                  > 0. Start a timer.
                  > 1. Raise an event to check for File.Exists("")
                  > 2. If File.Exists then Timer.Enabled=f alse.
                  >
                  >
                  > Or
                  >
                  > Do a while loop, with while(File.Exis ts())
                  >
                  > What do you guys recommend?
                  >
                  >
                  >[/color]


                    Comment

                    • Tim Stephenson
                      #6
                      Re: Opinion on how best to wait for a file

                      The Filesystemwatch er object is designed to do this, and will raise an event
                      when a file is created / modified / deleted within a specicified directory.
                      Get your code to start the watcher, then call the code you need to run once
                      the file's created in the handler for the appropriate event.

                      --

                      Regards

                      Tim Stephenson MCSD.NET
                      Charted MCAD & MCSD.NET Early Achiever


                      "john bailo" <jbailo@vestcom .com> wrote in message
                      news:775a4c308d d9257129c8fff27 5e823b2@news.te ranews.com...[color=blue]
                      > I'm writing a program to monitor the operation of a process.
                      >
                      > Part of the process involves trigging a method,
                      > then waiting for the creation of a flag file. I
                      > want my code to pause at that point.
                      >
                      > How would you recomment waiting and monitoring.
                      > I can think of two ways:
                      >
                      > 0. Start a timer.
                      > 1. Raise an event to check for File.Exists("")
                      > 2. If File.Exists then Timer.Enabled=f alse.
                      >
                      >
                      > Or
                      >
                      > Do a while loop, with while(File.Exis ts())
                      >
                      > What do you guys recommend?
                      >
                      >
                      >[/color]


                        Comment

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