CODEWITHSUNDEEP
cusbdriverlibusb
user3579757
user3579757

Reputation: 63

How to get USB iManufacturer number?

Here's my C code:

int main()
{
    struct usb_bus *busses, *bus;
    usb_init();
    usb_find_busses();
    usb_find_devices();

    busses = usb_get_busses();

    for (bus = busses; bus; bus = bus->next)
    {
        struct usb_device *dev;

        for (dev = bus->devices; dev; dev = dev->next)
        {
            struct usb_device_descriptor *desc;

            desc = &(dev->descriptor);
            printf("idVendor/idProduct ID: %2.2x : %2.2x\n",desc->idVendor,desc->idProduct);

            if ((desc->idVendor == 0x2232) && (desc->idProduct == 0x6001))
            {
                printf("iManafacturer/iProduct ID: %04x  :%04x \n",desc->iManufacturer,desc->iProduct);
                //return dev;
            }
        }
    }
    system("pause");
    return NULL;
}

After I complied the code (compile result), I can not get the iManufacturer number just like USBView result. I do not know how to get the iManufacturer (for example, NMGAAI00010200144W11111) like the USBView show.

How can I do this?

Compile result USBView result

Upvotes: 4

Views: 6341

Answers (1)

Leiaz
Leiaz

Reputation: 2917

The iManufacturer field of the device descriptor is the index of the manufacturer string descriptor. The string is optional, an index of 0 means there is no string.

If you want the string, you can use static int libusb_get_string_descriptor() to get the string in unicode in any available language or the convenience method int libusb_get_string_descriptor_ascii() that gives you a C "string" in the first available language. You need a libusb_device_handle first.

Quick ugly example without any error checking :

libusb_open(dev, &dev_handle);
unsigned char manufacturer[200];
libusb_get_string_descriptor_ascii(dev_handle, desc->iManufacturer,
  manufacturer,200);
printf("%s \n", manufacturer);

In 0.1, there are similar methods usb_get_string() and usb_get_string_simple().

Upvotes: 6

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