//C#控制打印机(直接发送打印机命令到打印机)

//一个打印机控制类,很有用的,其中使用了windows api控制lpt端口,对条码打印机的控制方法如下:将打印机的命令写到一个文件里，再使用之。

//代码：

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

namespace LPTControls

{

public class LPTControls

{

[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 nNumberOfBytesToWriter, out int lpNumberOfBytesWriten, out OVERLAPPED lpOverLapped);

[DllImport("kernel32.dll")]

private static extern bool CloseHandle(int hObject);

private int iHandle;

//打开LPT 端口

public bool Open()

{

iHandle = CreateFile("lpt1", 0x40000000, 0, 0, 3, 0, 0);

if (iHandle != -1)

{

return true;

}

else

{

return false;

}

}

//打印函数，参数为打印机的命令或者其他文本！

public bool Write(string MyString)

{

if (iHandle != 1)

{

int i;

OVERLAPPED x;

byte[] mybyte = System.Text.Encoding.Default.GetBytes(MyString);

return WriteFile(iHandle, mybyte, mybyte.Length, out i, out x);

}

else

{

throw new Exception("端口未打开~！");

}

}

//关闭打印端口

public bool Close()

{

return CloseHandle(iHandle);

}

}

}

//***************************************************************

//使用方法

private void button1_Click(object sender, EventArgs e)

{

LPTControls.LPTControls lpt = new LPTControls.LPTControls();

string mycommanglines = System.IO.File.ReadAllText("print.txt");//print.txt里写了条码机的命令

lpt.Open();

lpt.Write(mycommanglines);

lpt.Close();

}