libusb在检测驱动的时候出现问题，设备是通过vid、pid找到了，是不是驱动没装？

Question

dev_handle =libusb_open_device_with_vid_pid(ctx,0x0483,0x5750);
libusb_free_device_list(devs,1);
if(libusb_kernel_driver_active(dev_handle, 0) == 1) //find out if kernel driver is attached
qDebug()<<"Kernel Driver Active";
if(libusb_detach_kernel_driver(dev_handle, 0) == 0) //detach it
qDebug()<<"Kernel Driver Detached!";
int32_t r1 = libusb_claim_interface(dev_handle, 1);

Answer 1

运行时，libusb_free_device_list(devs,1); 之前都没问题，到检测驱动那里下面的打印没出来，最后libusb_clain_interface(dev_handle,1)的返回值也是负的