simulate a Enter key pressed on mouse click (ubuntu)

For those who want to achieve this on Linux,

I made a c++ program to capture mouse click and have Enter key pressed just after.

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <linux/input.h>
#include <cstring>

int main(int argc, char **argv)
{
    struct input_event event;
    int fd, bytes;
    unsigned char data[3];
    bool down = false;

    const char *pDevice = "/dev/input/by-id/usb-Logitech_USB_Receiver-if01-event-mouse";

    fd = open(pDevice, O_RDONLY | O_NONBLOCK);
    if (fd == -1)
    {
        printf("ERROR Opening %sn", pDevice);
        return -1;
    }

    while (1)
    {
        memset((void *)&event, 0, sizeof(event));
        bytes = read(fd, (void *)&event, sizeof(event));
        if (event.type == 1 && event.code == 272 && event.value == 1)
        {
            down = true;
        }
        if (event.type == 1 && event.code == 272 && event.value == 0)
        {
            down = false;
        }
        if (down)
            system("xdotool key Return");
    }
    return 0;
}

In the above program I tried to read the mouse events and data directly from the device in "/dev/input/by-id", my device events file name is "usb-Logitech_USB_Receiver-if01-event-mouse".

Once you have the events in a variable (i.e event), my mouse left button code is 272, not sure it is the universal code number for mouse left button, event.type = 1 ( not sure about this even ), event.value = 1 is mouse button down/pressed event whereas event.value = 0 is mouse up/released event.

Once mouse is pressed we have to hit Enter key on keyboard, for that I used xdotool, make sure you installed xdotool.

xdotool key Return triggers the Enter key pressed event on keyboard.

compile it to produce an executable named mouse

then you can run it using sudo ./mouse&

& is to run the command in background.

Thats it, now whenever your mouse left key is pressed, the Enter key on your keyboard is pressed until you release the button click.

Note: This program uses 100% cpu coz of the infinite while loop, but its normal.

I tested this on cs1.6 when I fired from pistol using mouse left key down, whole round fired automatically coz of Enter key pressed till I held the mouse key up.

Make sure you put Enter key to Fire in keyboard shotcuts in settings of cs1.6, I have Enter key as primary and - key as alternate to Fire in keyboard shortcuts.