//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(); }
public bool Write(byte[] mybyte) { if (iHandle != -1) { OVERLAPPED x = new OVERLAPPED(); int i = 0; return WriteFile(iHandle, mybyte, mybyte.Length, ref i, ref x); } else { throw new Exception("不能连接到打印机!"); } } 用的这个发送命令的。
{
if (iHandle != -1)
{
OVERLAPPED x = new OVERLAPPED();
int i = 0;
return WriteFile(iHandle, mybyte, mybyte.Length, ref i, ref x);
}
else
{
throw new Exception("不能连接到打印机!");
}
}
用的这个发送命令的。