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 Expansor_74165_LPT_01
{
    public partial class Form1 : Form
    {
        class ControlPort
        {
            [DllImport("inpout32.dll", EntryPoint = "Out32")]
            public static extern void Output(int adress, int value);

[DllImport("inpout32.dll", EntryPoint = "Inp32")]
            public static extern char Input(int adress);
        }

public Form1()
        {
            InitializeComponent();
        }

int puerto, i, dato;

private void Form1_Load(object sender, EventArgs e)
        {
            ControlPort.Output(0x378, 0x00);
        }

private void timer1_Tick(object sender, EventArgs e)
        {
            dato = 0;
            ControlPort.Output(0x378, 0x00);
            ControlPort.Output(0x378, 0x02);

puerto = ControlPort.Input(0x379);
            if (puerto == 126)
                dato = dato + 1;

for (i = 1; i <= 7; i++)
            {
                ControlPort.Output(0x378, 0x03);
                ControlPort.Output(0x378, 0x02);
                puerto = ControlPort.Input(0x379);
                if (puerto == 126)
                    dato = dato + (1 << i);
            }
            lblEntradas.Text = "Port: " + dato;
        }
    }
}

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