C++ Libusb isn't bringing back serial number of device - c++

Question

I'm currently working on a project that involves bringing information back from devices plugged in via true usb. To solve this, I'm attempting to use libusb in my C++ project. I'm on Windows 10, using C++ and QT Creator with QT version 5.2.1. I can get the vendor ID and product ID of my device with .idVendor and idProduct. However, my serial number is returning as 0 with .iSerialNumber. I'll post my code below and hopefully someone can help me figure out what I'm missing or suggest another library for me to try. Thanks!
bool CPumpFinder::pollTrueUSB(boolean &deviceFound, Device &newDevice)
{
boolean usbFound = FALSE;
boolean accuCheckFound = FALSE;
AccuGuideCom *acc = new AccuGuideCom();
libusb_device **devs; //pointer to pointer of device, used to retrieve a list of devices
libusb_context *ctx = NULL; //a libusb session
int r; //for return values
ssize_t cnt; //holding number of devices in list
r = libusb_init(&ctx); //initialize a library session
if(r < 0) {
return 1;
}
libusb_set_debug(ctx, 3); //set verbosity level to 3, as suggested in the documentation
cnt = libusb_get_device_list(ctx, &devs); //get the list of devices
if(cnt < 0) {
}
ssize_t i; //for iterating through the list
for(i = 0; i < cnt; i++) {
printdev(devs[i], usbFound, accuCheckFound); //print specs of this device
if(usbFound == TRUE)
{
if(accuCheckFound == TRUE)
{
newDevice.displayName = "ACCU-CHEK GUIDE";
newDevice.type = DEVICE_ACCUCHECKGUIDE;
newDevice.vendorID = accuVID;
newDevice.productID = accuPID;
newDevice.serial = accuSerial;
}
deviceFound = TRUE;
break;
}
}
libusb_free_device_list(devs, 1); //free the list, unref the devices in it
libusb_exit(ctx); //close the session
return deviceFound;
}
boolean CPumpFinder::printdev(libusb_device *dev, boolean &usbFound, boolean
&accuChekFound) {
libusb_device_descriptor desc;
int r = libusb_get_device_descriptor(dev, &desc);
if (r < 0) {
return usbFound;
}
uint16 vID = (uint16)desc.idVendor;
uint16 pID = (uint16)desc.idProduct; //desc.iSerialNumber
//#define ACCUCHEK_GUIDE_VENDORID (uint16)0x173A
//#define ACCUCHEK_GUIDE_PRODUCTID (uint16)0x21D5
if((vID == 5946) & (pID == 8661))
{
accuPID = pID;
accuVID = vID;
//Do serial?
accuSerial = "Test";
write_text_to_log_file("we did it");
accuChekFound = TRUE;
usbFound = TRUE;
}
if(usbFound == TRUE)
{
libusb_config_descriptor *config;
libusb_get_config_descriptor(dev, 0, &config);
const libusb_interface *inter;
const libusb_interface_descriptor *interdesc;
const libusb_endpoint_descriptor *epdesc;
for(int i=0; i<(int)config->bNumInterfaces; i++) {
inter = &config->interface[i];
for(int j=0; j<inter->num_altsetting; j++) {
interdesc = &inter->altsetting[j];
for(int k=0; k<(int)interdesc->bNumEndpoints; k++) {
epdesc = &interdesc->endpoint[k];
}
}
}
libusb_free_config_descriptor(config);
if(accuChekFound == TRUE)
{
return accuChekFound;
}
return usbFound;
}
return usbFound;
}