C#如何实现两台打印机同时打印

sunqiusong 2010-09-21 02:36:34

在网上找了一段代码，感觉很奇怪，用另一台打印可以直接打印（一台），但中文是乱码，而如果用另一台打印机打印一直处于打印等待状态，代码如下：



using System;

using System.IO;

using System.Drawing.Printing;

using System.Runtime.InteropServices;



namespace printer

{

    public class RawPrinterHelper

    {

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

        public struct DOCINFOW

        {

            [MarshalAs(UnmanagedType.LPWStr)]

            public string pDocName;

            [MarshalAs(UnmanagedType.LPWStr)]

            public string pOutputFile;

            [MarshalAs(UnmanagedType.LPWStr)]

            public string pDataType;

        }



        [DllImport("winspool.Drv", EntryPoint = "OpenPrinterW", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

        public static extern bool OpenPrinter(string src, ref IntPtr hPrinter, long pd);







        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

        public static extern bool ClosePrinter(IntPtr hPrinter);







        [DllImport("winspool.Drv", EntryPoint = "StartDocPrinterW", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

        public static extern bool StartDocPrinter(IntPtr hPrinter, int level, ref RawPrinterHelper.DOCINFOW pDI);







        [DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]

        public static extern bool EndDocPrinter(IntPtr hPrinter);





        [DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]

        public static extern bool StartPagePrinter(IntPtr hPrinter);





        [DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]

        public static extern bool EndPagePrinter(IntPtr hPrinter);





        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]

        public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, int dwCount, ref int dwWritten);







        public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)

        {

            IntPtr hPrinter = System.IntPtr.Zero;

            Int32 dwError;

            DOCINFOW di = new DOCINFOW();

            Int32 dwWritten = 0;

            bool bSuccess;

            di.pDocName = "My Document";

            di.pDataType = "RAW";

            bSuccess = false;

            if (OpenPrinter(szPrinterName, ref hPrinter, 0))

            {

                if (StartDocPrinter(hPrinter, 1, ref di))

                {

                    if (StartPagePrinter(hPrinter))

                    {

                        bSuccess = WritePrinter(hPrinter, pBytes, dwCount, ref dwWritten);

                        EndPagePrinter(hPrinter);

                    }

                    EndDocPrinter(hPrinter);

                }

                ClosePrinter(hPrinter);

            }

            if (bSuccess == false)

            {

                dwError = Marshal.GetLastWin32Error();

            }

            return bSuccess;



        }





        public static bool SendFileToPrinter(string szPrinterName, string szFileName)

        {

            FileStream stream1 = new FileStream(szFileName, FileMode.Open);

            BinaryReader reader1 = new BinaryReader(stream1);

            byte[] buffer1 = new byte[((int)stream1.Length) + 1];

            buffer1 = reader1.ReadBytes((int)stream1.Length);

            IntPtr ptr1 = Marshal.AllocCoTaskMem((int)stream1.Length);

            Marshal.Copy(buffer1, 0, ptr1, (int)stream1.Length);

            bool flag1 = RawPrinterHelper.SendBytesToPrinter(szPrinterName, ptr1, (int)stream1.Length);

            Marshal.FreeCoTaskMem(ptr1);

            return flag1;



        }



        public static void SendStringToPrinter(string szPrinterName, string szString)

        {

            IntPtr pBytes;

            Int32 dwCount;

            dwCount = szString.Length;

            pBytes = Marshal.StringToCoTaskMemAnsi(szString);

            SendBytesToPrinter(szPrinterName, pBytes, dwCount);

            Marshal.FreeCoTaskMem(pBytes);

        }

    }

}

调用方法如下：



 String sPrintStr = "2010/09/21\n";

            sPrintStr += "客户名称:__________________________\n";

            sPrintStr += "收货地址:__________________________\n";

            sPrintStr += "流 水 号:__________________________\n";

            sPrintStr += "提书单号:__________________________\n";

            sPrintStr += "包    号:__________________________\n";

            sPrintStr += "备    注:__________________________\n";

            sPrintStr += "发 货 方:__________________________\n";

            PrintDialog pd = new PrintDialog();

            pd.PrinterSettings = new PrinterSettings();

            RawPrinterHelper.SendStringToPrinter(pd.PrinterSettings.PrinterName, sPrintStr);

请教各位C#打印具体如何实现（直接打印，不能弹出打印机选择窗口）！！！！谢谢，C#不懂，只能网上找代码。。。

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