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Please do not use the C-API.

The first tutorial explains how to do this. I suggest you take a look at it, and the other tutorials to find out how to do things the proper way. It's much easier when you don't manage your own memory.

cv::Mat cvmat(nxi, nyi, CV_8UC4, c_mrcI->getImageData());
cv::imwrite("some.jpg", cvmat);
cv::imshow("some", cvmat);
cv::waitKey();