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Yeah. You need to change to fopen_s as fopen is unsafe.

You'll see the parameters for these functions are similar

stream = fopen(a,b,c)

to

fopen_s(&stream, a, b, c)

It's more of a C++ problem than an OpenCV one.

If you build OpenCV it should create a utility for generating samples.

Here's a good tutorial....

http://coding-robin.de/2013/07/22/train-your-own-opencv-haar-classifier.html