I can't find a way to attach a file, but here is a sample code that fails. I an extracting a lot of information so I am putting everything into a stream.

#include "libraw/libraw.h"
#include < iostream >
#include < sstream >

void getGPSinfo(string fileName)
{
LibRaw proc;
FILE *pf;
ostringstream stream;
proc.open_file(fileName);

libraw_gps_info_t GPSInfo = proc.imgdata.other.parsed_gps;

stream << "\"GPSAltitudeRef\"" << "->" << to_string(GPSInfo.altref);

pf = fopen("somePath\\debug.txt", "w");
fprintf(pf, stream.str().c_str());
fclose(pf);
proc.recycle();

}