OpenCV & ZBar scanning

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It is kind of bizarre. If you succeed in executing the code for a single image, then just put that in a seperate function, add a loop to go through video frames one by one and then apply the function to that specific frame. That would do the trick right?

The code from the sample is using images stored on the computer. I'm trying to loop trough the code frame by frame as you said yes (got the code from the openCV samples), but I'm getting this error:

Unhandled exception at 0x770E4B32 in ConsoleApplicationCV.exe: Microsoft C++ exception: cv::Exception at memory location 0x002FB3F4.

If you'd take the sample given above (see link), what would be the correct way to loop it then??

Just do something like

 VideoCapture capture ("location_to_video");
 Mat current_frame;
 while(true){
    capture >> current_frame;
    if( current_frame.isEmpty() ){break;}
   // apply functionality to your image here!
 }

And to add to this, your problem is probably a wrong pointer handling. The link you refer to is using the old depricated C api which will dissappear in the near future, so I would suggest switching the code to the C++ interface. Cannot be that hard.

How about the DataMatrix example given with openCV then? ( Samples -> Cpp -> video_dmtx.cpp ) Why is this only supporting up to 3 characters?

Because it is only a sample ... you should change it to your needs...

Yeah, I'm reading the code, and checking the source of it over and over (also in objdeteect.hpp). But I can't seem to find where the 3 character limit is set? Or, what would I've to add to make it read 10 characters then (for example).

I do not have time to dig into the code myself ... got my own projects to finish!