await the end of ScanContinuously [possible enhancement]

[PaulARoy]

Hi,

I am having trouble detecting the end of ScanContinuously and I think it could be a great enhancement to be able to await the moment it is dismissed.

Is there any way to know when ScanContinuously is dismissed?

My use case is to scan a lot of barcodes and analyze them afterwards.

It could be changing the signature to Task, an event or a property, anything.

Thanks!

[PaulARoy]

I needed it so I forked ZXing and implemented it.

I can make a PR if you want (a code review could be great to check it is done correctly)

[ScottFrank]

Hey @PaulARoy,

I just wanted to chime in and let you know that I have the same use case as you do, and ran into the same problem. I was thinking of just making it take a canceled handler in addition to the scan handler. Then the canceled handler could do the work on the list of results. I like your approach, too though.

@Redth, is this issue being considered? Looks like Paul has a fix for it and is willing to submit a PR. It seems like this use case would be fairly common.

Thanks!
Scott

[Redth]

@PaulARoy i'm up for seeing a PR... I might be picky in how this would be implemented though... I'd kind of like to add a Task ScanContinuouslyAsync (..) to do it... ideas are welcome!

[PaulARoy]

Hi Redth,
I have been using my async implementation successfully for roughly 6 month in production now.

I will try to submit a PR soon for you to check if the implementation is OK for you. If I remember well it is quite simple and very similar to ScanAsync().

[PaulARoy]

PR attached
#367