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instead of:

codes.row(i) = code;

which creates a temporary Mat header, you want:

code.copyTo(codes.row(i));

think of it like this: a cv::Mat holds continuous data, you can't simply insert an arbitrary pointer anywhere you like, but need to memcpy the specific region.

then, my compiler chokes on this:

 std::cout<<"codes.row= "<<codes.row<<std::endl;

codes.row is a function, you probably meant

 std::cout<<"codes.row= "<<codes.row(i) <<std::endl;