Versión C# de una clase para imprimir usando ZPL

Sobre todo en ambientes Industriales es muy socorrido el uso de impresoras Zebra, en seguida el código fuente, la siguiente clase implementa un buen Wrapper.

using System;
using System.IO;
using System.Runtime;
using System.Runtime.InteropServices;

namespace F.IO.Zebra
{
    /// <summary> 
    /// This class can print zebra labels to either a network share, LPT, or COM port. 
    /// 
    /// Programmer: Rick Chronister 
    /// </summary> 
    /// <remarks>Only tested for network share, but in theory works for LPT and COM.</remarks> 
    public class Printer
    {
        private const int GENERIC_WRITE = 0x40000000;
        private const int OPEN_EXISTING = 3;
        private const int FILE_SHARE_WRITE = 0x2;

        private StreamWriter _fileWriter;
        private FileStream _outFile;
        private int _hPort;

        /// <summary> 
        /// Structure for CreateFile. Used only to fill requirement 
        /// </summary> 
        [StructLayout(LayoutKind.Sequential)]
        public struct SECURITY_ATTRIBUTES
        {
            private int nLength;
            private int lpSecurityDescriptor;
            private int bInheritHandle;
        }

        [DllImport("kernel32", EntryPoint = "CloseHandle", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern int CloseHandle(int hObject);

        [DllImport("kernel32", EntryPoint = "CreateFileA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]//Define Win32 functions 
        private static extern int CreateFile(string lpFileName, int dwDesiredAccess, int dwShareMode, [MarshalAs(UnmanagedType.Struct)] ref SECURITY_ATTRIBUTES lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, int hTemplateFile);


        /// <summary> 
        /// This function must be called first. Printer path must be a COM Port or a UNC path. 
        /// </summary> 
        public void StartWrite(string printerPath)
        {
            SECURITY_ATTRIBUTES SA = default(SECURITY_ATTRIBUTES);

            IntPtr hPortP = default(IntPtr);
            //Dim retval As Integer 

            //Create connection 
            _hPort = CreateFile(printerPath, Printer.GENERIC_WRITE, Printer.FILE_SHARE_WRITE, ref SA, OPEN_EXISTING, 0, 0);

            //Get unsafe pointer 
            hPortP = new IntPtr(_hPort);
            //convert Integer to IntPtr 

            //Create file stream 
            _outFile = new FileStream(hPortP, FileAccess.Write);

            //Create stream writer 
            _fileWriter = new StreamWriter(_outFile);

        }
        /// <summary> 
        /// This will write a command to the printer. 
        /// </summary> 
        public void Write(string rawLine)
        {
            _fileWriter.WriteLine(rawLine);
        }
        /// <summary> 
        /// This function must be called after writing to the zebra printer. 
        /// </summary> 
        public void EndWrite()
        {
            //Clean up 
            _fileWriter.Flush();
            _fileWriter.Close();
            _outFile.Close();
            CloseHandle(_hPort);
        }
    }
}