Is golang-evdev a alternative to my use-case ?

[AlexMcGopher]

Hi, As github does not allow to send any message to gvalkov, I try a issue to state my question to him

Its a question, if golang-evdev can be used in my use-case...

Currently I am using a USB-Device https://www.usbbutton.com/ to toggle the state of a software.

As the device can only output a pre-defined textsequence, like "send-signal.sh(enter)"
I have to use the cli as a separate step to start a shellscript, that is
sending a signal to my app (sudo pkill -USR1 MyApp). Then the app reacts to the signal by toggling its state.

Press USB-Button -> USB Device pastes text sequence to cli "send-signal.sh(enter)" -> cli execute shellscript -> Shellscript sends signal to software -> Software toggles state

As this is a quite complicated way to toggle the software status, and I was wondering if golang-evdev
is able to do the trick also, even without using the cli.

Press USB-Button -> golang-evdev -> Software toggles state

As its a headless device, it would be great if I don't have to use cli in future as I do currently....

Thanks and best regards

Alex

[AlexMcGopher]

One week passed without reaction...

[maitredede]

Hello @AlexMcGopher,

I don't have this device, but I have a use case that could help you.

I have a barcode reader that is seen as a keyboard, but I don't want the "keyboard" behavior. So I intercept the keypress and catch the barcode read, so I can handle it myself.

In your case, I don't know how the device is seen by the system (probably a keyboard), so with this lib you can easily catch your keypress and do your own magic.

Here is an extract of the code I have :

devices, err := evdev.ListInputDevices()
// find the good device
device := devices[0]
// catch device events
device.Grab()
for {
    evt, err := device.ReadOne()
    switch evt.Type {
        case evdev.EV_KEY:
            // handle the event
    }
}