C#指定斑马打印机名称来打印，不区分并口，USB等

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Drawing;using System.Drawing.Printing;using System.Windows.Forms;using System.Runtime.InteropServices;namespace BarCode{   public class BarCode    {          [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]        public class DOCINFOA        {            [MarshalAs(UnmanagedType.LPStr)]            public string pDocName;            [MarshalAs(UnmanagedType.LPStr)]            public string pOutputFile;            [MarshalAs(UnmanagedType.LPStr)]            public string pDataType;        }        [DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);        [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool ClosePrinter(IntPtr hPrinter);        [DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);        [DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool EndDocPrinter(IntPtr hPrinter);        [DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool StartPagePrinter(IntPtr hPrinter);        [DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool EndPagePrinter(IntPtr hPrinter);        [DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]        public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);                // When the function is given a printer name and an unmanaged array        // of bytes, the function sends those bytes to the print queue.        // Returns true on success, false on failure.        public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)        {            Int32 dwError = 0, dwWritten = 0;            IntPtr hPrinter = new IntPtr(0);            DOCINFOA di = new DOCINFOA();            bool bSuccess = false; // Assume failure unless you specifically succeed.            di.pDocName = "My C#.NET RAW Document";            di.pDataType = "RAW";            // Open the printer.            if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))            {                // Start a document.                if (StartDocPrinter(hPrinter, 1, di))                {                    // Start a page.                    if (StartPagePrinter(hPrinter))                    {                        // Write your bytes.                        bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);                        EndPagePrinter(hPrinter);                    }                    EndDocPrinter(hPrinter);                }                ClosePrinter(hPrinter);            }            // If you did not succeed, GetLastError may give more information            // about why not.            if (bSuccess == false)            {                dwError = Marshal.GetLastWin32Error();            }            return bSuccess;        }        public static bool SendFileToPrinter(string szPrinterName, string szFileName)        {            // Open the file.            FileStream fs = new FileStream(szFileName, FileMode.Open);            // Create a BinaryReader on the file.            BinaryReader br = new BinaryReader(fs);            // Dim an array of bytes big enough to hold the file's contents.            Byte[] bytes = new Byte[fs.Length];            bool bSuccess = false;            // Your unmanaged pointer.            IntPtr pUnmanagedBytes = new IntPtr(0);            int nLength;            nLength = Convert.ToInt32(fs.Length);            // Read the contents of the file into the array.            bytes = br.ReadBytes(nLength);            // Allocate some unmanaged memory for those bytes.            pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);            // Copy the managed byte array into the unmanaged array.            Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);            // Send the unmanaged bytes to the printer.            bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength);            // Free the unmanaged memory that you allocated earlier.            Marshal.FreeCoTaskMem(pUnmanagedBytes);            return bSuccess;        }        public static bool SendStringToPrinter(string szPrinterName, string szString)        {            IntPtr pBytes;            Int32 dwCount;            // How many characters are in the string?            dwCount = szString.Length;            // Assume that the printer is expecting ANSI text, and then convert            // the string to ANSI text.            pBytes = Marshal.StringToCoTaskMemAnsi(szString);            // Send the converted ANSI string to the printer.            SendBytesToPrinter(szPrinterName, pBytes, dwCount);            Marshal.FreeCoTaskMem(pBytes);            return true;        }   }