c++ - 根据USB VID :PID in Linux获取设备路径

Question

如果我插入一个设备，比如 /dev/ttyUSB0，我想根据它的 VID:PID(通过 lsusb 找到)得到数字 0 )，我怎么能在 C++ Linux 中做到这一点？我有这段代码可以找到一台打印机设备，如果它有帮助的话:

int printer_open (void)
{    
    char printer_location[] = "/dev/usb/lpX";
    struct stat buf;

    // continuously try all numbers until stat returns true for the connected printer
    for (int i = 0; i < 10; i++)
    {
        printer_location[11] = '0' + i;
        if (!stat (printer_location, &buf))
            break;
    }

    return 0;
}

Answer 1

你可以使用libusb
apt-get install build-essential libudev-dev
这是一个很好的例子:
http://www.dreamincode.net/forums/topic/148707-introduction-to-using-libusb-10/
这是库描述:
http://libusb.sourceforge.net/api-1.0/

int main() {
    libusb_context *context = NULL;
    libusb_device **list = NULL;
    int rc = 0;
    ssize_t count = 0;

    rc = libusb_init(&context);
    assert(rc == 0);

    count = libusb_get_device_list(context, &list);
    assert(count > 0);

    for (size_t idx = 0; idx < count; ++idx) {
        libusb_device *device = list[idx];
        libusb_device_descriptor desc = {0};

        rc = libusb_get_device_descriptor(device, &desc);
        assert(rc == 0);

        printf("Vendor:Device = %04x:%04x\n", desc.idVendor, desc.idProduct);
    }
}

如果您编译代码，请不要忘记添加库引用 -I/usr/include/libusb-1.0/ 和 - lusb-1.0