Capturing QR codes using mergAV - how to?

[Terry Judd]

Thanks Scott – ok, I’ve got mergAVCamCaptureImage doing something now now so that’s a step in the right direction (I actually had a spelling syntax error – mergeAV instead of mergAV – doh). With respect to the barcode stuff, does that work on a captured image or does it access the specified camera directly? Looking at the code in the sample stack (which I now have) it seems like the latter but I didn’t get a response when I put a QR code in front of it.

Regards,

Terry...


BTW, where did you get the mergAV sample stack from


On 6/09/2016 4:58 pm, "use-livecode on behalf of Scott Morrow" <use-livecode-bounces at lists.runrev.com on behalf of scott at elementarysoftware.com> wrote:

    Hello Terry,
    
    The thing that tripped me up initially with mergAV (even though it was clearly part of the demo stack) was the two-part request for:
    
    mergAVRequestMediaAccess “audio"
    
    which, when granted then requests
    
    mergAVRequestMediaAccess “video”
    
    I didn’t figure that I needed to  request “audio” access for scanning a QR code. Fortunately Mike Kerner straightened me out. Audio access is required in order to use the camera. If that isn’t the problem then give another shout. (I switched from using mergZXing to mergAV when building an app that let my students scan QR codes.)
    
    --
    Scott Morrow
    
    Elementary Software
    (Now with 20% less chalk dust!)
    web       http://elementarysoftware.com/
    email     scott at elementarysoftware.com
    office     1-800-615-0867
    ------------------------------------------------------
    
    > On Sep 5, 2016, at 11:27 PM, Terry Judd <terry.judd at unimelb.edu.au> wrote:
    > 
    > Hi – I’m trying to build a simple iOS app to capture and decode QR codes (for marking student attendance at compulsory activities) and am a bit stuck getting the mergAV external to work its magic.
    > 
    > I can capture an image ok using the mergAVPick() function with the rear camera but I was thinking that perhaps I should be using mergAVCamCaptureImage instead? If so then I’m going wrong somewhere as it does nothing when I call that command. I’m assuming I need to call mergAVCamCreate first and then set it up using the mergAVCamSet command. Is that right?
    > 
    > I seem to recall someone mentioning that they were using mergAV successfully to ‘scan’ QR codes a while back (and that it was superior to mergXZing in that regard). Does anyone have any tips/samples they would be willing to share?
    > 
    > Best regards.
    > 
    > Terry...
    > 
    > 
    > Terry Judd  | Senior Lecturer in Medical Education
    > Department of Medical Education<http://medicine.unimelb.edu.au/medical-education>
    > The University of Melbourne<http://www.unimelb.edu.au>
    > M: 0435 961 594  |  E: terry.judd at unimelb.edu.au<mailto:tsj at unimelb.edu.au>
    > Publications<https://scholar.google.com.au/citations?user=XC5s6wwAAAAJ&hl=en>
    > 
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