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Save Xml file directory problem. Openframeworks and fileStorage

Hello,

I'm working on an OpenFrameworks app, where I am using the OpenCV addon (ofxOpenCV). The problem occurs when I try to save the ANN parameters on a xml file. The xml does not appear on the entire system. I try another version with a simple matrix and the result is the same.

I am using Xcode (C++). OpenCV version : 2.4.9.

I try the following code and return the weights (one of the ANN parameters) so, maybe somewhere there is the xml file...

    FileStorage fs;
    fs.open("mlp.xml", FileStorage::WRITE);
    ann[0]->write(fs);
    fs.release();

    FileStorage opencv_file("mlp.xml", FileStorage::READ);
    Ptr<ANN_MLP> nn = ANN_MLP::create();

    nn->read(opencv_file.root());
    cout << nn->getWeights(0) <<endl; //RETURN THE WEIGHTS
    opencv_file.release();

I also try to read by fileNode and the output matrix is empty.

The idea is to load/save (write/read) different xml files (or other types of files) to set different ANN parameters.

Any idea?

Thank you! Ignasi.