open_device_with_vid_pid not working as expected

[Darkskald]

I tried to call the Context method open_device_with_context with a vendor id and product id from which I know that they are present, but calling the method yields None.

When iterating over the devices:

fn main() {
    let context = Context::new().unwrap();
    let devices = context.devices().unwrap();
    for device in devices.iter(){
        println!("{:?}", device.device_descriptor().unwrap());
    }
}

I see

DeviceDescriptor { bLength: 18, bDescriptorType: 1, bcdUSB: 512, bDeviceClass: 0, bDeviceSubClass: 0, bDeviceProtocol: 0, bMaxPacketSize: 64, idVendor: 3768, idProduct: 59906, bcdDevice: 0, iManufacturer: 1, iProduct: 2, iSerialNumber: 3, bNumConfigurations: 1 }
``

but calling

```rust
let mut handle = context.open_device_with_vid_pid(3768, 59906);

yields None.

[Frank Pagliughi]

In order to open the device you would need the proper permissions and, possibly, drivers installed. This can be different depending on the OS you're trying this on.

[Ilya Averyanov]

Please check that you use proper driver and have correct permission. Also check this https://github.com/libusb/libusb/wiki/Windows#how-to-use-libusb-on-windows if you use rusb on windows