CODEWITHSUNDEEP
c++clinuxlibusb
Mathew Wright
Mathew Wright

Reputation: 95

segmentation fault on libusb_get_device_with_vid_pid

I'm trying to open a connection to a camera from a raspberry pi 2 over usb. I'm able to detect the camera but when I try to open a connection using 

libusb_open_device_with_vid_pid(null, vendor id, product id);

But I receive a segmentation fault. I've narrowed it down and that line of code is what causes the segmentation fault. 

void opendevice(){
    libusb_device_handle* dev;
    struct libusb_device_descriptor* desc;
    int err;

dev = libusb_open_device_with_vid_pid(NULL,0x2a0b,0x00f8);

   if (dev == NULL){
        printf("device not found\n");
       }

else {
     err = libusb_claim_interface(dev, 0);
     }    
}

The message from the pi opened over putty on my computer is.

Segmentation fault

Any ideas as to what I am doing wrong?

Upvotes: 0

Views: 1119

Answers (1)

donjuedo
donjuedo

Reputation: 2505

You are getting NULL for dev, and using it anyway. You could add a return statement after the printf(), or an else before the libusb_claim_interface().

Upvotes: 1

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