Programacion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Contador_LPT_01
{
    public partial class Form1 : Form
    {
        class ControlPort
        {
            [DllImport("inpout32.dll", EntryPoint = "Out32")]
            public static extern void Output(int adress, int value);
        }

public Form1()
        {
            InitializeComponent();
        }

byte cnt = 0;

private void btnMas_Click(object sender, EventArgs e)
        {
            if (cnt < 9)
            {
                cnt++;
                ControlPort.Output(0x378, cnt);
            }
            lblContador.Text = cnt.ToString();
        }

private void btnMenos_Click(object sender, EventArgs e)
        {
            if (cnt > 0)
            {
                cnt--;
                ControlPort.Output(0x378, cnt);
            }
            lblContador.Text = cnt.ToString();
        }

private void Form1_Load(object sender, EventArgs e)
        {
            ControlPort.Output(0x378, 0);
        }
    }
}

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