打印机---并口打印机设置并口问题

我在深圳搬砖-Justin 2010-03-27 08:13:01

这一个星期被打印机深深的折磨着
关于发送数据到并口操作EPSON TM-U220 PB打印机
网上找的一段代码,



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

        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.Unicode, 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", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]

        public static extern bool ClosePrinter(IntPtr hPrinter);



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

        public static extern bool EndDocPrinter(IntPtr hPrinter);



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

        public static extern bool StartPagePrinter(IntPtr hPrinter);



        [DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", CharSet = CharSet.Unicode, SetLastError = true, 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, byte[] pBytes, int dwCount, ref int dwWritten); 



        public static bool SendBytesToPrinter(string szPrinterName, byte[] pBytes, Int32 dwCount)

        {//最主要的方法,发送数据到并口的

            Int32 dwError = 0, dwWritten = 0;

            IntPtr hPrinter = new IntPtr(0);

            DOCINFOA di = new DOCINFOA();

            bool bSuccess = false; 

            di.pDocName = " C#.NET并口打印";

            di.pDataType = "RAW";



            if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))

            {

                if (StartDocPrinter(hPrinter, 1, 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 void SendStringToPrinter(string szPrinterName, string szString)

        {

            Int32 dwCount;

            byte[] f = Encoding.GetEncoding("Gb18030").GetBytes(szString); 

            

            dwCount = f.Length;

            SendBytesToPrinter(szPrinterName, f, dwCount);

        }