Button to executes M-Code with adjustable argument

component getscale;

pin in float scale           "Receives scale value";

pin in bit trigger = 0       "connected to the button";

option singleton yes;               
option userspace yes;

author "ArcEye";
license "GPL";
;;

#include <stdio.h>    /* Standard input/output definitions */
#include <stdlib.h> 
#include <stdint.h>   /* Standard types */
#include <string.h>   /* String function definitions */
#include <unistd.h>   /* UNIX standard function definitions */
#include <fcntl.h>    /* File control definitions */
#include <errno.h>    /* Error number definitions */
#include <signal.h>
int done = 0;


void adios(int sig)
{
    done = 1;
}


void user_mainloop(void)
{
char buff[256];
int triggered = 0;

    signal(SIGINT, adios);
    signal(SIGTERM, adios);
    bzero(buff,256);
    while(!done)
        {
        usleep(250000);
        
        FOR_ALL_INSTS()  
            { 
            if(trigger && !triggered)
                {
                sprintf(buff, "M101 P%08.03f", scale);
                system(buff);
                bzero(buff,256);
                triggered = 1;  // prevent further activations until button released
                }
            else if(!trigger && triggered)
                {
                triggered = 0;
                }
            }           
        }

    exit(0);
}

<scale>
    <font>("Helvetica",10)</font>
    <width>"15"</width>
    <halpin>"m104scale"</halpin>
    <resolution>0.5</resolution>
    <orient>HORIZONTAL</orient>
    <initval>15</initval>
    <min_>1</min_>
    <max_>30</max_>
</scale>

<button>
	<halpin>"m104button"</halpin>
	<text>"Execute M104"</text>
	<font>("Helvetica",10)</font>
   </button>

net m104-scale pyvcp.m104scale-f => motion.analog-in-00
net m104-button halui.mdi-command-00 <= pyvcp.m104button

MDI_COMMAND = o<m104file> call

o<m104file> sub
M66 E0 L0 (store analog pin 0)
#<scalenumber> = #5399
M104 P#<scalenumber>
o<m104file> endsub
M2

<spinbox>
                <width>"6"</width>
                <halpin>"cantidad"</halpin>
button>
            <halpin>"actual-param"</halpin>
            <text>"Actualizar"</text>

net remote-analin00 motion.analog-in-00 <= pyvcp.cantidad
net remote-actual-param halui.mdi-command-00 <= pyvcp.actual-param

o<101> sub
M66 E0 L0 
(#1=#5399)
o<101> endsub
M2

g0 x#5399
g91
x150
y150
x-150
y-150

m30