C#中Lpt端口打印类怎么用

这篇文章主要介绍C#中Lpt端口打印类怎么用，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

C#LPT端口打印类的操作是什么呢？首先让我们看看什么是LPT端口（打印机专用）？LPT端口是一种增强了的双向并行传输接口，在USB接口出现以前是扫描仪，打印机最常用的接口。***传输速度为1.5Mbps，设备容易安装及使用，但是速度比较慢，下面是C#LPT端口打印类的操作具体实例：

using System;  using System.Runtime.InteropServices;  using System.IO;  namespace printBarcode  {   /// 
   /// LPTControl 的摘要说明，C#LPT端口打印类的操作   /// 
   public class LPTControl    {   public LPTControl()  {}   [StructLayout(LayoutKind.Sequential)]   private struct OVERLAPPED   {    int Internal;    int InternalHigh;    int Offset;    int OffSetHigh;    int hEvent;   }   [DllImport("kernel32.dll")]   private static extern int CreateFile(    string lpFileName,    uint dwDesiredAccess,    int dwShareMode,    int lpSecurityAttributes,    int dwCreationDisposition,    int dwFlagsAndAttributes,    int hTemplateFile    );   [DllImport("kernel32.dll")]   private static extern bool WriteFile(    int hFile,    byte[] lpBuffer,    int nNumberOfBytesToWrite,    ref int lpNumberOfBytesWritten,    ref OVERLAPPED lpOverlapped    );   [DllImport("kernel32.dll")]   private static extern bool CloseHandle(    int hObject    ); //C#LPT端口打印类的操作  private int iHandle;   public bool Open()   {    iHandle=CreateFile("lpt1",0x40000000,0,0,3,0,0);    if(iHandle !=-1)    {   return true;    }    else    {   return false;    }   }   public bool Write(String Mystring)   {    if(iHandle !=-1)    {   int i=0;   OVERLAPPED x=new OVERLAPPED();   byte[]mybyte=  System.Text.Encoding.Default.GetBytes(Mystring);   return WriteFile(  iHandle,mybyte,mybyte.Length,ref i,ref x);    }    else    {   throw new Exception("端口未打开!");    }   }   public bool Close()   {    return CloseHandle(iHandle);   }    }//C#LPT端口打印类的操作  }

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