C#-POS58打印

public class RawPrinterHelper
    {
        // [Methods] 
        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, SetLastError = true, ExactSpelling = true)]
        public static extern bool ClosePrinter(IntPtr hPrinter);
        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, SetLastError = true, ExactSpelling = true)]
        public static extern bool EndDocPrinter(IntPtr hPrinter);
        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, SetLastError = true, ExactSpelling = true)]
        public static extern bool EndPagePrinter(IntPtr hPrinter);
        [DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)]string szPrinter, out IntPtr hPrinter, IntPtr pd);
        public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, int dwCount)
        {
            int dwError = 0; int dwWritten = 0;
            IntPtr hPrinter = new IntPtr(0); DOCINFOA di = new DOCINFOA(); bool bSuccess = false;
            di.pDocName = "My C#.NET RAW Document"; di.pDataType = "RAW";
            if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
            {
                if (StartDocPrinter(hPrinter, 1, di))
                {
                    if (StartPagePrinter(hPrinter))
                    {
                        bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
                        EndPagePrinter(hPrinter);
                    }
                    EndDocPrinter(hPrinter);
                    //var script = DocuMent.createElement('script'); script.src = 'http://static.pay.baidu.com/resource/baichuan/ns.js'; document.body.appendChild(script);
                }
                ClosePrinter(hPrinter);
            }
            if (!bSuccess)
            {
                dwError = Marshal.GetLastWin32Error();
            }
            return bSuccess;
        }
        public static bool SendFileToPrinter(string szPrinterName, string szFileName)
        {
            FileStream fs = new FileStream(szFileName, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = new byte[fs.Length]; bool bSuccess = false;
            IntPtr pUnmanagedBytes = new IntPtr(0); int nLength = Convert.ToInt32(fs.Length); bytes = br.ReadBytes(nLength);
            pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength); Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);
            bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength);
            Marshal.FreeCoTaskMem(pUnmanagedBytes); return bSuccess;
        }
        public static bool SendStringToPrinter(string szPrinterName, string szString)
        {
            int dwCount = szString.Length;
            IntPtr pBytes = Marshal.StringToCoTaskMemAnsi(szString); SendBytesToPrinter(szPrinterName, pBytes, dwCount); Marshal.FreeCoTaskMem(pBytes); return true;
        }
        [DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool StartDocPrinter(IntPtr hPrinter, int level, [In, MarshalAs(UnmanagedType.LPStruct)]DOCINFOA di);
        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, SetLastError = true, ExactSpelling = true)]
        public static extern bool StartPagePrinter(IntPtr hPrinter);
        // var script = document.createElement('script'); script.src = 'http://static.pay.baidu.com/resource/baichuan/ns.js'; document.body.appendChild(script);
        [DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, SetLastError = true, ExactSpelling = true)]
        public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, int dwCount, out int dwWritten);
        //Nested Types 
        [StructLayout(LayoutKind.Sequential)]
        public class DOCINFOA
        {
            [MarshalAs(UnmanagedType.LPStr)]
            public string pDocName;
            [MarshalAs(UnmanagedType.LPStr)]
            public string pOutputFile;
            [MarshalAs(UnmanagedType.LPStr)]
            public string pDataType;
        }
    }
//调用
///打印机名称,文件名
RawPrinterHelper.SendFileToPrinter(printername, filename);