Script trying to get product ids from xinput

getprod.c

#include <stdio.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/extensions/XInput.h>
#include <X11/extensions/XInput2.h>
#include <xorg/xserver-properties.h>

int main() {
    Display *dpy = XOpenDisplay(NULL);
    int ndevices;
    XDeviceInfo *info = XListInputDevices(dpy, &ndevices);
    Atom enabled = XInternAtom(dpy, XI_PROP_ENABLED, True);
    Atom prod = XInternAtom(dpy, XI_PROP_PRODUCT_ID, True);

    for(int i = 0; i < ndevices; ++i) {
        XDeviceInfo *dev = info + i;
        Atom tr;
        int fr;
        unsigned long num, bytes;
        unsigned char *data;

        Status status = XIGetProperty(dpy, info->id, enabled, 0, 1, False, XA_INTEGER, &tr, &fr, &num, &bytes, &data);
        if(status == Success) 
            printf("Property retrieval results: %lu %i %lu %lu %hhx\n", tr, fr, num, bytes, *data);

        status = XIGetProperty(dpy, info->id, prod, 0, 2, False, XA_INTEGER, &tr, &fr, &num, &bytes, &data);
        if(status == Success) 
            printf("Property retrieval results: %lu %i %lu %lu %u\n", tr, fr, num, bytes, data);
    }

    return 0;
}