How to suppress OpenCV error message

Question

I am writing an OpenCV project using g++ and opencv 2.4.6

I have some code like this:

try 
{
    H = findHomography( obj, scene, CV_RANSAC );
}
catch         


        

Answer 1

cv::error() is called on every occurrence of an assertion failure. The default behavior is to print the assertion statement to std::cerr.

You can use the undocumented cv::redirectError() function to set a custom error-handling callback. This will override the default behavior of cv::error(). You first need to define a custom error-handling function:

int handleError( int status, const char* func_name,
            const char* err_msg, const char* file_name,
            int line, void* userdata )
{
    //Do nothing -- will suppress console output
    return 0;   //Return value is not used
}

And then set the callback before the code which throw:

    cv::redirectError(handleError);

try {
    // Etc...

If at any point you wish to restore the default behavior, you can do so:

cv::redirectError(nullptr);    //Restore default behavior; pass NULL if no C++11