C# 关于打印 - PrintRaw

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 public class PrintRaw
    {
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public class DOC_INFO_1
        {
            [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)] DOC_INFO_1 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);

        public void Print(String printerName, String filename)
        {
            IntPtr lhPrinter;
            OpenPrinter(printerName, out lhPrinter, new IntPtr(0));

            if (lhPrinter.ToInt32() == 0)
                new Exception($"Not find printer [{printerName}]");

            var rawPrinter = new DOC_INFO_1() { pDocName = "My Document", pDataType = "RAW" };

            StartDocPrinter(lhPrinter, 1, rawPrinter);

            using (var b = new BinaryReader(File.Open(filename, FileMode.Open)))
            {
                var length = (int)b.BaseStream.Length;
                const int bufferSize = 8192;

                var numLoops = length / bufferSize;
                var leftOver = length % bufferSize;

                for (int i = 0; i < numLoops; i++)
                {
                    var buffer = new byte[bufferSize];
                    int dwWritten;

                    b.Read(buffer, 0, bufferSize);
                    IntPtr unmanagedPointer = Marshal.AllocHGlobal(buffer.Length);
                    Marshal.Copy(buffer, 0, unmanagedPointer, buffer.Length);
                    WritePrinter(lhPrinter, unmanagedPointer, bufferSize, out dwWritten);
                    Marshal.FreeHGlobal(unmanagedPointer);
                }

                if (leftOver > 0)
                {
                    var buffer = new byte[leftOver];
                    int dwWritten;

                    b.Read(buffer, 0, leftOver);
                    IntPtr unmanagedPointer = Marshal.AllocHGlobal(buffer.Length);
                    Marshal.Copy(buffer, 0, unmanagedPointer, buffer.Length);
                    var result = WritePrinter(lhPrinter, unmanagedPointer, leftOver, out dwWritten);
                    Marshal.FreeHGlobal(unmanagedPointer);
                }
            }

            EndDocPrinter(lhPrinter);
            ClosePrinter(lhPrinter);
        }
    }

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