Multiple "generate user event" in event loop
Hello.
1.) I am wondering if you can user a "generate user event" into an event loop to create a quasi-state machine.
For example create an event loop with the events "event a", "event b," "event c," and so on. The in "event a" put in a function to generate a user event to call "event b". Then "event b" will call "event c" and so on.
2.) If this is possible, then can u put multiple generate user events into a single event loop and have it queue the generate user events up. For example have the "event 1" case use the "generate user event" 3 times (generating "event 7" "event 8" and "event 9.") to call the next three future event cases in that order?
Thanks
Charlie C.
Of course it is possible, easiest with simply writing signaling properties. (See attached examples, LabVIEW 7.1).
You have to be very careful that you don't create trigger loops, e.g. event A triggers Event B, which triggers Event A ... ad infinitum! :0
Example "Multievents": event 1 triggers event 2, which triggers event 3.
Example Multievents2": event 1 triggers events 2-3-2-stop in sequence.
Message Edited by altenbach on 09-28-2005 01:26 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
MultiEvents.vi 57 KB
MultiEvents2.vi 72 KB
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I was trying to disable a Button on the frontpanel by using its enabled property while the event was executed. The ide wa not to create more events of this buttopn while its fucntion was executed. However thsi did not work.It was creating events even though it was greyed out.
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2) in the event case of the button (value changed) in a sequence I disbaled the Button and then started a second event. The Second event executed the code and then enabled the Button egain
Result: Even though the Button was greyed out events were generated
3) in the event case of the button (value changed) in a sequence I first dispalbned the button, execuded the code and in the timeout event I thenenabled it again
Result: No additional events were generated
it seems that the enable state of the button is analysed at teh time when the event is execute din teh event case but not at the time when it was created?
So I Tried the Time Input of the case expecting that it woudl give me a time stamp of the time when the key was pressed - but instead it gave me the time point when teh event was executed...
Teh only othe rsolution was to set teh cursor to busy (however I dont want to see the changed cursor during the busy cycle)
So how can I make shure that no additional events are fired during the time teh code of the Button s executed?
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The evet takes about one or two seconds - I checked the behaviour as shown in the attached examples with LV 8.5, LV 2010, TV2011, LV2012 - allways exactly the same behaviour.
It does not make any difference weather you use switch when pressed or latched when pressed.
It does not make any difference weathe ror not you tag "Lock front panel" for that event
to sth:
> If you disable a front panel control (ie the button) you cannot click on it and a value changed event will not be
generated.
This is my experience so far as well, but if you disable and enable the control within the same event it does not work (see attaced example 1) and 2). It only works if you do the enable in the timeout event.
> The time stamp from the event case left hand property is the time of the event not the time of execution.
> If you ask for the timer value inside the event case it will be the time of event case executing.
In the attached exampel this is not the case. The time differecne between the Time input on the left and the Tick count
placed in the event is 0 for all events generated whil the button is supposed to be disabled.
As I wrote before, the explanation I have for this behaviour is that the events are generated by windows weather or not
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or not the button is disabled and ignores the event in case it is disabled. If the Disabling and enabling is done
withim the same event the button pressed events are added to thw event queue and the button is set to enabled before the next event (button pressed while it shoul be disabled) is handeled. When that event is handeled the button is enabled again (by the original event) and therefore the evenet is not ignored (because by the time of execution of the event the button is enabled again).
If the button is enabled in the timeout event instead of the button change value event all event in teh queue are executed before teh timeout event. At their time of execution therefore the button is steill disabled. Only then the timeout event enables the button again.
If the vi is set to busy (sand clock) this is activating actually a windows function/property and no events are queued to teh event queue by windwos. Therefore no button change event is added to teh queue.
Funtciomn of the 3 attached Vis (LV 2010):
Run the Vi, then press the Test button once - when it is greyed out click it a few more times. The test button value
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DisableButton 1: Disable and enable are ste in teh same event
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Attachments:
DisableButton1-3.zip 29 KB
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