Troubleshooting USB Communication with Qt and libusb for Embedded Device Recognition

I have an embedded USB device called 'Cruise Dongle USBP' with VID 0x0001 and PID 0x0002 (these values are just for testing) for which I loaded the WinUSB driver using Zadig.

Attachment 13860

Attachment 13861

Now I want to communicate with this device in Qt using the libusb library, but when I search for it, the library cannot find it.

Code:

---

void USBDevice::ScanUsbDevices()
{
    libusb_context *ctx = nullptr;
    libusb_device **device_list = nullptr;
    ssize_t count;
 
    if (libusb_init(&ctx) != 0) {
        qWarning() << "Error initializing libusb";
    }
 
    // Get the device list
    count = libusb_get_device_list(ctx, &device_list);
 
    if (count < 0) {
        usbList->addItem("Error: Unable to get the device list.");
        libusb_exit(ctx);
        return;
    }
 
    qDebug() << "USB devices found:" << count;
 
    // usbList->addItem(QString("USB devices found: %1").arg(count));
 
    // Iterate over the found devices
    for (ssize_t i = 0; i < count; i++) {
        libusb_device *device = device_list[i];
        libusb_device_descriptor desc;
 
        if (libusb_get_device_descriptor(device, &desc) == 0) {
            QString info = QString("VID: 0x%1 PID: 0x%2")
            .arg(desc.idVendor, 4, 16, QChar('0'))
                .arg(desc.idProduct, 4, 16, QChar('0'));
 
            // Try to open the device to read extra information
            libusb_device_handle *handle;
            if (libusb_open(device, &handle) == 0) {
                unsigned char buffer[256];
 
                if (desc.iManufacturer && libusb_get_string_descriptor_ascii(handle, desc.iManufacturer, buffer, sizeof(buffer)) > 0) {
                    info += " | Manufacturer: " + QString::fromUtf8(reinterpret_cast<char*>(buffer));
                }
 
                if (desc.iProduct && libusb_get_string_descriptor_ascii(handle, desc.iProduct, buffer, sizeof(buffer)) > 0) {
                    info += " | Product: " + QString::fromUtf8(reinterpret_cast<char*>(buffer));
                }
 
                libusb_close(handle);
            }
 
            // usbList->addItem(info);
            qDebug() << info;
        }
    }
 
    // Free the device list
    libusb_free_device_list(device_list, 1);
    libusb_exit(ctx);
}

---

that returns

Code:

---

AllK required contiguous memory = 675016 (64bit)
  8 HotK Handles: HandleSize 2112 PoolSize 16912 (bytes)
  64 LstK Handles: HandleSize 64 PoolSize 4112 (bytes)
  2048 LstInfoK Handles: HandleSize 64 PoolSize 131088 (bytes)
  128 UsbK Handles: HandleSize 96 PoolSize 12304 (bytes)
  64 DevK Handles: HandleSize 112 PoolSize 7184 (bytes)
  2048 OvlK Handles: HandleSize 104 PoolSize 213008 (bytes)
  64 OvlPoolK Handles: HandleSize 96 PoolSize 6160 (bytes)
  32 StmK Handles: HandleSize 176 PoolSize 5648 (bytes)
  2048 IsochK Handles: HandleSize 136 PoolSize 278544 (bytes)
 
Dynamically allocated as needed:
	KLST_DEVINFO = 2596 bytes each
USB devices found: 6
"VID: 0x8086 PID: 0xa36d"
"VID: 0x8087 PID: 0x0aaa"
"VID: 0x10de PID: 0x1ada"
"VID: 0x0b05 PID: 0x1866 | Manufacturer: ASUSTeK Computer Inc. | Product: N-KEY Device"
"VID: 0x046d PID: 0xc01e | Manufacturer: Logitech | Product: USB-PS/2 Optical Mouse"
"VID: 0x1366 PID: 0x1050"

---

I have tried reinstalling the drivers and changing them to Klibusb or others, but nothing works. Can anyone give me some advice?