LinuxQuestions.org - adding UI to a console program (with source)

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- - adding UI to a console program (with source) (https://www.linuxquestions.org/questions/linux-newbie-8/adding-ui-to-a-console-program-with-source-365766/)

adding UI to a console program (with source)

I have a shell script ,
and would like to add a UI on it. (I use FLTK)
Some buttons on UI will command to the console program.
The response of the console program will be displayed on UI.

Many recommand pipe is suitable.
Since it is uni-directional , so i have to establish 2 pipes.

UI -> pipe2 -> console program
<- pipe1 <-

User just face to UI and don't care about the console.

The following is my codes.
Now i do coding of the reading part , but cannot make it.
Could someone give me a hand?

Code:



[menu.sh]

#!/bin/bash

let "loop=0"

while test $loop == 0

do

echo "Please choose the letter of the game you want to run and  enter"

echo "------------------------------------------------------"

echo "a. Checking files"

echo "b. PWD"

echo "c. Adding string to file"

echo "------------------------------------------------------"

echo "q. quit"

echo "choice?"

read choice



case $choice in q)

let "loop=1"

esac

case $choice in a)

clear

echo "You are checking the files of this directory!"

ls -al

esac

case $choice in b)

clear

echo "You are checking the current directory"

pwd

esac

case $choice in c)

clear

echo "You are adding string to a file"

echo "I am number1" >> text.txt

esac

done



[fltk_popen_demo.cxx]

// demo use of popen() and Fl::add_fd() - erco 10/04/04

#include <stdio.h>

#include <stdlib.h>

#include <FL/Fl.H>

#include <FL/Fl_Window.H>

#include <FL/Fl_Multi_Browser.H>



#include <unistd.h>



FILE *G_fp = NULL;



void HandleFD(int fd, void *data) {

    Fl_Multi_Browser *brow = (Fl_Multi_Browser*)data;

    char s[1024];

    if ( fgets(s, 1023, G_fp) == NULL ) {

        Fl::remove_fd(fileno(G_fp));

        pclose(G_fp);

        return;

    }

    brow->add(s);

}



int main() {



    system("sh runme1.sh");



    Fl_Window win(600,600);

    Fl_Multi_Browser brow(10,10,580,580);

    if ( ( G_fp = popen("cat < pipe1", "r" ) ) == NULL ) {

        perror("popen failed");

        return(1);

    }

    Fl::add_fd(fileno(G_fp), HandleFD, (void*)&brow);

    win.resizable(brow);

    win.show();

    return(Fl::run());

}





[runme1.sh]

#!/bin/sh

if [ ! -e pipe1 ];then

mknod pipe1 p

fi

if [ ! -e pipe2 ];then

mknod pipe2 p

fi

sh ./menu.sh >pipe1 <pipe2

change in fifo way

Now i use fifo to solve the problem above:

Code:

[menu.sh]

#!/bin/bash

while [ 1 ]; do

    echo ""

    echo "Menu Options"

    echo "    a) Do an ls -la"

    echo "    b) netstat -r"

    echo "    c) date/who"

    echo "    q) quit"

    echo ""

    echo "Your choice?"

    read choice

    if [ ! $? ]; then echo 'Parent closed'; exit 1; fi

    case $choice in

        q) exit 0 ;;

        a) ls -la ;;

        b) netstat -r ;;

        c) date; w ;;

    esac

done





[demo-fifo.cxx]

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/types.h>  // mkfifo

#include <sys/stat.h>  // mkfifo

#include <fcntl.h>      // open

#include <signal.h>    // killpg



#include <FL/Fl.H>

#include <FL/Fl_Window.H>

#include <FL/Fl_Multi_Browser.H>

#include <FL/Fl_Button.H>



//

// Demonstrate how to use fltk with named pipes

// erco 1.00 09/21/2005

//



// Globals

FILE *G_in = NULL;              // how we read the child

int  G_out = 0;                // how we write to the child



// Close all descriptors, remove fifo

void CleanExit_CB(Fl_Widget*, void *data) {

    unlink("tomenu.fifo");

    killpg(getpid(), SIGKILL);

    _exit(0);

}



// Read output from child, append to browser

void HandleInput_CB(int, void *data) {

    Fl_Multi_Browser *brow = (Fl_Multi_Browser*)data;

    char s[1024];

    if ( fgets(s, 1023, G_in) == NULL ) {

        CleanExit_CB(0,0);

    }

    brow->add(s);

}



// Handle sending commands to child when button pressed

void HandleButton_CB(Fl_Widget*, void *data) {

    char *msg = (char*)data;

    write(G_out, (char*)msg, strlen(msg));

}



int main() {

    // Process group leader (for killpg())

    setsid();

    // Make fifo

    unlink("tomenu.fifo");

    if ( mkfifo("tomenu.fifo", 0666) < 0 ) {

        perror("mkfifo(tomenu.fifo)");

        exit(1);

    }

    // Popen child for reading, set child to read fifo

    if ( ( G_in = popen("./menu.sh < tomenu.fifo", "r") ) == NULL ) {

        perror("popen failed");

        exit(1);

    }

    setbuf(G_in, NULL);        // disable buffering

    // Now open fifo

    if ( ( G_out = open("tomenu.fifo", O_WRONLY) ) < 0 ) {

        perror("open(tomenu.fifo) for write failed");

        unlink("tomenu.fifo");

        exit(1);

    }

    Fl_Window win(600,600);

    win.callback(CleanExit_CB);

    Fl_Button a(10, 10, 20, 20, "A"); a.callback(HandleButton_CB, (void*)"a\n");

    Fl_Button b(30, 10, 20, 20, "B"); b.callback(HandleButton_CB, (void*)"b\n");

    Fl_Button c(50, 10, 20, 20, "C"); c.callback(HandleButton_CB, (void*)"c\n");

    Fl_Multi_Browser brow(10,30,580,560);

    brow.textfont(FL_COURIER);

    Fl::add_fd(fileno(G_in), HandleInput_CB, (void*)&brow);

    win.resizable(brow);

    win.show();

    return(Fl::run());

}

But if i change the script to a console mode program,
it would fail... >_<

for example,
linphonec is a console mode VoIP program.
http://simon.morlat.free.fr/download/0.12.2/rpm/

Code:

[demo_fifo.cxx] no change!

[menu.sh] run the linphonec in background

#!/bin/sh

linphonec &

Could anyone give me a hand???