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Multithreaded Updating of StatusBarI am using a status bar to show progress for a long database update. With
the single threading, the GUI often gets stuck and does not show updating, especially when the user clicks to another program and tries to come back. The multithreading stuff is looking somewhat complicated. Can somebody show me a pre-built function on how to continuously update a status bar while another process is running. Should I run the database process on a new thread and keep the status bar on the main thread? Derek controls belong to the thread they were created on, so unless you create your
progressbar dynamically from a new thread, it belongs to your programs main thread. so in order to change the progress bar from another thread, you need to use Me.Invoke(). you shouldnt access other threads object and such. create a sub on the main thread like so Private Sub ChangeProgValue(byval val as integer) Me.progressbar1.Value = val end sub then create a delagate Private Delegate Sub ProgDelegate(byval y as Integer) then when you want to change the progress value on the other thread do this in a sub of the second thread Dim x as new ProgDelegate(AddressOf ChangeProgValue) Dim obj() as Object = {some value to change progressbar} Me.Invoke(x, obj) that should work for ya -- -iwdu15 controls belong to the thread they were created on, so unless you create your
progressbar dynamically from a new thread, it belongs to your programs main thread. so in order to change the progress bar from another thread, you need to use Me.Invoke(). you shouldnt access other threads object and such. create a sub on the main thread like so Private Sub ChangeProgValue(byval val as integer) Me.progressbar1.Value = val end sub then create a delagate Private Delegate Sub ProgDelegate(byval y as Integer) then when you want to change the progress value on the other thread do this in a sub of the second thread Dim x as new ProgDelegate(AddressOf ChangeProgValue) Dim obj() as Object = {some value to change progressbar} Me.Invoke(x, obj) that should work for ya -- -iwdu15 Derek,
I am always currious which process can run aside a DataBase Update with its chance on all kind of errors, can you explain it? Moreover because that you said that you had problems realizing your problem with the progressbar. What is maybe difficult with the Fill but not with the Update and keeps automaticly the form alive. Cor Show quoteHide quote "Derek Hart" <derekmh***@yahoo.com> schreef in bericht news:%23VPzRfXnGHA.4636@TK2MSFTNGP03.phx.gbl... >I am using a status bar to show progress for a long database update. With >the single threading, the GUI often gets stuck and does not show updating, >especially when the user clicks to another program and tries to come back. >The multithreading stuff is looking somewhat complicated. Can somebody >show me a pre-built function on how to continuously update a status bar >while another process is running. Should I run the database process on a >new thread and keep the status bar on the main thread? > > Derek > I did not understand your questions Cor. Can you elaborate?
Derek Show quoteHide quote "Cor Ligthert [MVP]" <notmyfirstn***@planet.nl> wrote in message news:eGh7exZnGHA.3436@TK2MSFTNGP02.phx.gbl... > Derek, > > I am always currious which process can run aside a DataBase Update with > its chance on all kind of errors, can you explain it? Moreover because > that you said that you had problems realizing your problem with the > progressbar. What is maybe difficult with the Fill but not with the Update > and keeps automaticly the form alive. > > Cor > > "Derek Hart" <derekmh***@yahoo.com> schreef in bericht > news:%23VPzRfXnGHA.4636@TK2MSFTNGP03.phx.gbl... >>I am using a status bar to show progress for a long database update. With >>the single threading, the GUI often gets stuck and does not show updating, >>especially when the user clicks to another program and tries to come back. >>The multithreading stuff is looking somewhat complicated. Can somebody >>show me a pre-built function on how to continuously update a status bar >>while another process is running. Should I run the database process on a >>new thread and keep the status bar on the main thread? >> >> Derek >> > > >I did not understand your questions Cor. Can you elaborate? What is the deeper reason that you use multithreading.> In other words which processes run assynchonosly side by side. Cor Show quoteHide quote > Derek > > > "Cor Ligthert [MVP]" <notmyfirstn***@planet.nl> wrote in message > news:eGh7exZnGHA.3436@TK2MSFTNGP02.phx.gbl... >> Derek, >> >> I am always currious which process can run aside a DataBase Update with >> its chance on all kind of errors, can you explain it? Moreover because >> that you said that you had problems realizing your problem with the >> progressbar. What is maybe difficult with the Fill but not with the >> Update and keeps automaticly the form alive. >> >> Cor >> >> "Derek Hart" <derekmh***@yahoo.com> schreef in bericht >> news:%23VPzRfXnGHA.4636@TK2MSFTNGP03.phx.gbl... >>>I am using a status bar to show progress for a long database update. >>>With the single threading, the GUI often gets stuck and does not show >>>updating, especially when the user clicks to another program and tries to >>>come back. The multithreading stuff is looking somewhat complicated. Can >>>somebody show me a pre-built function on how to continuously update a >>>status bar while another process is running. Should I run the database >>>process on a new thread and keep the status bar on the main thread? >>> >>> Derek >>> >> >> > > I have a long database process that runs, and a status bar that updates
showing progress. If the user moves to another application and moves back to my app, the status bar is in frozen mode and does not update until the end of the database process. Show quoteHide quote "Cor Ligthert [MVP]" <notmyfirstn***@planet.nl> wrote in message news:%23NIQyignGHA.4784@TK2MSFTNGP04.phx.gbl... > >I did not understand your questions Cor. Can you elaborate? >> > What is the deeper reason that you use multithreading. > > In other words which processes run assynchonosly side by side. > > Cor > >> Derek >> >> >> "Cor Ligthert [MVP]" <notmyfirstn***@planet.nl> wrote in message >> news:eGh7exZnGHA.3436@TK2MSFTNGP02.phx.gbl... >>> Derek, >>> >>> I am always currious which process can run aside a DataBase Update with >>> its chance on all kind of errors, can you explain it? Moreover because >>> that you said that you had problems realizing your problem with the >>> progressbar. What is maybe difficult with the Fill but not with the >>> Update and keeps automaticly the form alive. >>> >>> Cor >>> >>> "Derek Hart" <derekmh***@yahoo.com> schreef in bericht >>> news:%23VPzRfXnGHA.4636@TK2MSFTNGP03.phx.gbl... >>>>I am using a status bar to show progress for a long database update. >>>>With the single threading, the GUI often gets stuck and does not show >>>>updating, especially when the user clicks to another program and tries >>>>to come back. The multithreading stuff is looking somewhat complicated. >>>>Can somebody show me a pre-built function on how to continuously update >>>>a status bar while another process is running. Should I run the database >>>>process on a new thread and keep the status bar on the main thread? >>>> >>>> Derek >>>> >>> >>> >> >> > > 
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