程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#入門知識 >> C#編程完成向並口裝備發送指令、獲得並口裝備的狀況

C#編程完成向並口裝備發送指令、獲得並口裝備的狀況

編輯:C#入門知識

C#編程完成向並口裝備發送指令、獲得並口裝備的狀況。本站提示廣大學習愛好者:(C#編程完成向並口裝備發送指令、獲得並口裝備的狀況)文章只能為提供參考,不一定能成為您想要的結果。以下是C#編程完成向並口裝備發送指令、獲得並口裝備的狀況正文


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;
        //創立實例
        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 };//要發送的敕令(16進制)
          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);//獲得的狀況值
        }
        else
        {
          MessageBox.Show("創立文件掉敗!");
        }
      }
      catch(Exception ex)
      {
        MessageBox.Show(ex.Message);
      }
      finally
      {
        if (iHandle > 0)
        {
          CloseHandle(iHandle);
        }
      }
    }
  }
}

 
  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved