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Well, looking at the sample code, you call parser.check() to see if there were any errors, and then parser.printErrors() tells you what went wrong.
http://docs.opencv.org/3.1.0/d0/d2e/classcv_1_1CommandLineParser.html#a2dfd78bcc9dfae2250fedf5d8c9a3857
It doesn't say if calling parser.has("s") would return false if there were errors, I suppose you'd have to check that yourself.
