keybd_event

by micmonay

micmonay / keybd_event

For simulate key press in Linux, Windows and Mac in golang

149 Stars 22 Forks Last release: 8 months ago (v1.1.0) MIT License 70 Commits 3 Releases

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keybd_event

go.dev reference

This library simulates the key press on a keyboard. It runs on Linux, Windows and Mac.

Important : - The keys change in the different keyboard layouts of the target computer(s). - I have tested this code on my system and I don't find any errors. If you have a bug, please create an issue.

Example :

package main

import ( "runtime" "time" "github.com/micmonay/keybd_event" )

func main() { kb, err := keybd_event.NewKeyBonding() if err != nil { panic(err) }

// For linux, it is very important to wait 2 seconds
if runtime.GOOS == "linux" {
    time.Sleep(2 * time.Second)
}

// Select keys to be pressed
kb.SetKeys(keybd_event.VK_A, keybd_event.VK_B) 

// Set shift to be pressed
kb.HasSHIFT(true) 

// Press the selected keys
err = kb.Launching() 
if err != nil {
    panic(err)
}

// Or you can use Press and Release
kb.Press()
time.Sleep(10 * time.Millisecond)
kb.Release()

// Here, the program will generate "ABAB" as if they were pressed on the keyboard.

}

For easy access to all the keys on the virtual keyboard, I have added more special keycodes constants

VK_SP*
.

Below is an illustration showing the "VK_" symbols for each key on the keyboard: keyboard.png

Linux

On Linux this library uses uinput, which on the major distributions requires root permissions.

The easy solution is executing through root user (by using

sudo
). A worse way is by changing the executable's permissions by using
chmod
.

Secure Linux Example

sudo groupadd uinput
sudo usermod -a -G uinput my_username
sudo udevadm control --reload-rules
echo "SUBSYSTEM==\"misc\", KERNEL==\"uinput\", GROUP=\"uinput\", MODE=\"0660\"" | sudo tee /etc/udev/rules.d/uinput.rules
echo uinput | sudo tee /etc/modules-load.d/uinput.conf

Another subtlety on Linux: it is important after creating the

keybd_event
to wait 2 seconds before running first keyboard actions.

Darwin (MacOS)

This library depends on Apple's frameworks, and I did not find a solution to cross-compile from another OS to MacOS.

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