I'm starting with just few things in your code:
- First of all, argv is useless
- The filename are suppose to be string, ie: "C:\opencv243..."
- Are you not suppose to use "C:\opencv243..." instead of "C:\opencv243..." on windows?
- I suppose the bip is coming from C:\att because \a in cout produce a bip, try C:\att...
- I think your program stop quickly by catch(cv::Exception& e) because you cannot open the file.
Try to fix it, the rest of the code seems correct.
