libusb_control_setup

 libusb_fill_control_transfer(transfer, devh, buf, ctrl_urb_complete_cb,

            utrans, 1000);

transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;

    if (libusb_submit_transfer(transfer) < 0)

    {

        libusb_free_transfer(transfer);

        return -22;

    }

//控制传输