I'm getting NotFound error when trying to open a HID device.

[Boscop]

I'm trying to open my keyboard device (to get keypress events for the additional keys that it has), but I always get Err(NotFound) when trying to open() it, why?

let (vid, pid) = (0x1B1C, 0x1B11);
for device in devices.filter(|d| d.vendor_id() == vid && d.product_id() == pid) {
	let path = device.path().to_string_lossy().to_string();
	if path.contains("col03") {
		println!("{} ", path);
		match device.open() {
			Ok(handle) => {
				// ...
			}
			Err(e) => println!("{:?}", e)
		}
	}
}

According to this reponse, it should work. How can the device be "NotFound" when it clearly exists?

I have to get this working, I'd really appreciate any help on this :)

[meh]

What's the operating system?

[Boscop]

Win 8.1

[phrohdoh]

I am hitting the same error on GNU/Linux Ubuntu 17.04 with a DS4 connected via USB.

VID and PID:

idVendor           0x054c Sony Corp.
idProduct          0x05c4 DualShock 4

As you can see here I can read data from the device via /dev/hidraw2:

thill@txps:~/src/drivers/ds4-rs$ sudo hexdump -v -e '64/1 "%02x" "\n"' /dev/hidraw2 -n64
017f807a7a08000c0000ab15090000fffffeff5d024320cd0000000000001b000001078538c33280000000008000000080000000008000000080000000008000

extern crate hid;

fn main() {
    let mgr = hid::init().unwrap();

    let vid = 0x054c;
    let pid = 0x05c4;

    for ds4 in mgr.find(Some(vid), Some(pid)) {
        let mut ds4 = match ds4.open() {
            Ok(v) => v,
            Err(e) => {
                eprintln!("ERROR: {}", e); // always prints: ERROR: Device not found.
                return;
            }
        };
    }
}

[phrohdoh]

I obviously cannot speak for @Boscop but my issue was the lack of proper udev rules for the DS4.

[crides]

@phrohdoh Can you explain what changes you've made to your udev rules?

[phrohdoh]

Sorry, I don't even have that machine anymore so I do not recall at this point.