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Apr 8th, 2009

stop method from executing

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hi guys, i have a pocket pc application where i scan some barcodes, i want to stop scanning when i open a new form.
do you have any ideas how to stop it?

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serkan sendur

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Apr 8th, 2009

Re: stop method from executing

The same way you normally stop scanning bar codes?

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Apr 8th, 2009

Re: stop method from executing

Click to Expand / Collapse Quote originally posted by thoughtcoder ...

The same way you normally stop scanning bar codes?

actually my problem was device specific, the scantimeout can be set to 10 seconds which means it is going to scan continuously for 10 seconds, i wanted to stop it but i couldnt because it only stops when the timout is reached or the key is released or something is scanned. i work on handheld dolphin 7900 with sdk 111, it appearantly does not have such method to interrupt scanning.

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Apr 9th, 2009

Re: stop method from executing

Could you maybe set a scan timeout for a shorter period of time, set that running on a thread, and have that thread check for some type of stop "signal" before scanning again? I think a Singleton pattern or something could work for this:

instantiate a "ScanMonitor" object that has a "Cancel" boolean property. (This can go to your scan() method)

Then, you could have another thread change ScanMonitor's Cancel property to "true" when you need to stop scanning.

set a while(true) loop to keep looping on that scan method with a short scan time, but before you scan, check if ScanMonitor.Cancel == true.

Does that make sense?

alc6379

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Apr 10th, 2009

Re: stop method from executing

Click to Expand / Collapse Quote originally posted by alc6379 ...

Could you maybe set a scan timeout for a shorter period of time, set that running on a thread, and have that thread check for some type of stop "signal" before scanning again? I think a Singleton pattern or something could work for this:

instantiate a "ScanMonitor" object that has a "Cancel" boolean property. (This can go to your scan() method)

Then, you could have another thread change ScanMonitor's Cancel property to "true" when you need to stop scanning.

set a while(true) loop to keep looping on that scan method with a short scan time, but before you scan, check if ScanMonitor.Cancel == true.

Does that make sense?

Actually it doesnt bother to have the scanning on after moving to another form because its scan handle method checks if any handler is registered to that event, since there is none, it does not do anything on the next form, so i got around the problem.
i think i could use some multithreading functionality like abort or interrupt thread, but anyway simpler is better.
thanks.

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Apr 11th, 2009

Re: stop method from executing

To stop it noway else putting it on a specific thread then in some defined cases you kill this thread.

Ramy Mahrous

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