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Non Halting Timer
Posted: Thu Jan 31, 2008 1:28 am
by TimeSurfer
Is there a way I can make a timer that doesnt halt the application that uses it? I'm trying to make a timer dll for use in autoplay media studio 7 and after several different attempts all my efforts are leaving me frustrated as the timer seems to halt the application till its done.
any ideas would great
Posted: Thu Jan 31, 2008 1:50 am
by eriansa
not sure what you mean by halting the app, but a multimedia timer runs in it's own thread :
hTimer = timeSetEvent_(1, 0, @myTimerCallback(), 0, #TIME_PERIODIC)
Posted: Thu Jan 31, 2008 1:50 am
by srod
Either use a thread instead, or when you receive the #WM_TIMER message, call a thread to do the necessary work etc. You'll probably need to add some logic to ensure you don't have more than one such thread running at a time etc.
**EDIT : or do what eriansa said!
Posted: Thu Jan 31, 2008 3:01 am
by TimeSurfer
by halting i mean that when i call the dll it seems to prevent my application from doing anything till the timer finishs. I need the timer to run in the background.
Posted: Thu Jan 31, 2008 9:57 am
by Baldrick
Maybe this is what u seek
Code: Select all
Procedure proc()
Debug "proc called via Settimer thread"
EndProcedure
If OpenWindow(0,0,0,200,100,"Test",#PB_Window_MinimizeGadget|#PB_Window_ScreenCentered)
If CreateGadgetList(WindowID(0))
StringGadget(0,10,10,50,20,"1",#PB_String_Numeric)
ButtonGadget(1,10,70,50,20,"Run")
ButtonGadget(2,70,70,50,20,"Stop")
EndIf
EndIf
Repeat
Ev=WaitWindowEvent(1)
Tmr.l=ElapsedMilliseconds()
If Ev=#PB_Event_Gadget
Select EventGadget()
Case 1 ;run btn
period=Val(GetGadgetText(0))*1000
If period<1000
period=1000
EndIf
Settmr=SetTimer_(WindowID(0), 1, period, @proc()) ;start api timer thread
Debug "timer started"
Case 2 ;stop btn
If Settmr
KillTimer_(WindowID(0),Settmr); kill api timer
Settmr=0
Debug "timer stopped"
EndIf
EndSelect
EndIf
Until Ev=#PB_Event_CloseWindow
Posted: Thu Jan 31, 2008 10:11 am
by TimeSurfer
baldric thank you so much that is exactly what i was looking for
KUDOS
Posted: Thu Jan 31, 2008 11:47 am
by srod
Well, any timer created with SetTimer_() does not actually run in the background; it runs within the process which created it and is processed only when DespatchMessage_() find a #WM_TIMER message etc. The messages themselves are posted to the processes message queue 'in the background' by Windows itself, but not the actual processing thereof which will run and halt the main process etc.