using System;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Text;

using System.Windows.Forms;

namespace ParallelPort

{

    public partial class Form1 : Form

    {

        const uint GENERIC_READ = 0x80000000;

        const uint GENERIC_WRITE = 0x40000000;

        const uint FILE_ATTRIBUTE_NORMAL = 0x80;

        #region win32 API

        [DllImport("kernel32.dll ")]

        private static extern int CreateFile(

            string lpFileName,

            uint dwDesiredAccess,

            int dwShareMode,

            int lpSecurityAttributes,

            int dwCreationDisposition,

            uint dwFlagsAndAttributes,

            int hTemplateFile

           );

        [DllImport("kernel32.dll ")]

        private static extern bool WriteFile(

            int hFile,

            byte[] lpBuffer,

            int nNumberOfBytesToWrite,

            ref int lpNumberOfBytesWritten,

            int lpOverlapped

           );

        [DllImport("kernel32.dll ")]

        private static extern bool DefineDosDevice(

        int dwFlags,

        string lpDeviceName,

        string lpTargetPath);

        [DllImport("kernel32.dll ")]

        private static extern bool CloseHandle(

            int hObject

           );

        [DllImport("kernel32.dll ")]

        private static extern bool ReadFile(

            int hFile,

            byte[] lpBuffer,

            int nNumberOfBytesToRead,

            ref int lpNumberOfBytesRead,

            int lpOverlapped

           );

       #endregion

        public Form1()

        {

           InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            int iHandle = -1;

            try

            {

               int i = 0;

               //创建实例

               DefineDosDevice(0x00000001, "LptPortName",@"\Device\Parallel0");

               iHandle = CreateFile(@"\\.\LptPortName",GENERIC_READ | GENERIC_WRITE, 0, 0, 3, FILE_ATTRIBUTE_NORMAL, 0);

               if (iHandle !=-1)

               {

                   byte[] mybyte = new byte[3]{ 0x12, 0x14, 0x14 };//要发送的命令（16进制）

                   WriteFile(iHandle, mybyte, mybyte.Length, ref i, 0);

                   byte[] mybyte1 = new byte[3];

                   string content = String.Empty;

                   int j = 0;

                   ReadFile(iHandle, mybyte1, 3, ref j,  0);

                   if (mybyte1 != null)

                   {

                        foreach(var tempByte in mybyte1)

                        {

                            content += tempByte.ToString();

                        }

                   }

                   MessageBox.Show(content);//获取的状态值

               }

               else

               {

                   MessageBox.Show("创建文件失败!");

               }

            }

            catch(Exception ex)

            {

               MessageBox.Show(ex.Message);

            }

            finally

            {

               if (iHandle > 0)

               {

                   CloseHandle(iHandle);

               }

            }

        }

    }

}