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The documentation states, that a NULL or an empty window name can be used to refer to the control panel. But the string parameters of the C++ frontend methods cannot be NULL and converting an empty string to a const char* by c_str() doesn't produce a NULL pointer, but an empty string. Unfortunately, the const char* pointer is just passed on to the standard C functions in the QT backend, which doesn't check for the empty string case. There are two places where the empty string check could have been introduced: inside the frontend or inside the backend. As long as the documentation only mentions this as a special case for the QT backend, the best place seems to be there.
OpenCV: Open Source Computer Vision Library
Resources
- Homepage: http://opencv.org
- Docs: http://docs.opencv.org
- Q&A forum: http://answers.opencv.org
- Issue tracking: http://code.opencv.org
Contributing
Please read before starting work on a pull request: http://code.opencv.org/projects/opencv/wiki/How_to_contribute
Summary of guidelines:
- One pull request per issue;
- Choose the right base branch;
- Include tests and documentation;
- Clean up "oops" commits before submitting;
- Follow the coding style guide.