using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;

namespace InjectionPC
{
    public class PrinterHelper
    {
        #region WIN32 API - Print Module

        [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);

        #endregion

        #region public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount) - 바이트 데이터를 출력 합니다.

        /// <summary>
        /// 
        /// </summary>
        /// <param name="szPrinterName"></param>
        /// <param name="pBytes"></param>
        /// <param name="dwCount"></param>
        /// <returns></returns>
        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;
        }

        #endregion

        #region public static bool SendFileToPrinter(string szPrinterName, string szFileName) - 파일의 raw 데이터를 출력 합니다.

        /// <summary>
        /// 
        /// </summary>
        /// <param name="szPrinterName"></param>
        /// <param name="szFileName"></param>
        /// <returns></returns>
        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;
        }

        #endregion

        #region public static bool SendStringToPrinter(string szPrinterName, string szString) - 문자열을 print 합니다.

        /// <summary>
        ///  
        /// </summary>
        /// <param name="szPrinterName"></param>
        /// <param name="szString"></param>
        /// <returns></returns>
        public static bool SendStringToPrinter(string szPrinterName, string szString)
        {
            IntPtr pBytes;
            //Int32 dwCount;

            byte[] pvBuffer = utf16_gbk(szString);

            int bCount = pvBuffer.Length;

            // allocate some unmanaged memory
            pBytes = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(bCount);

            // copy the byte[] into the memory pointer
            System.Runtime.InteropServices.Marshal.Copy(pvBuffer, 0, pBytes, bCount);

            // Send the converted byte[] to the printer.
            SendBytesToPrinter(szPrinterName, pBytes, bCount);

            // free the unmanaged memory
            System.Runtime.InteropServices.Marshal.FreeCoTaskMem(pBytes);

            return true;
        }

        public static bool tcpPrint(string str)
        {
            bool result = false;
            byte[] cmdBytes = utf16_gbk(str);
            TcpClient tcp = new TcpClient();
            try
            {
                tcp.Connect("192.168.1.30", 9100);
                tcp.SendTimeout = 1000;
                tcp.ReceiveTimeout = 1000;
                if (tcp.Connected)
                {
                    tcp.Client.Send(cmdBytes);
                    result = true;
                }
            }
            catch (Exception ex)
            {
                throw new Exception("打印失败，请检查打印机或网络设置。", ex);
            }
            finally
            {
                if (tcp != null)
                {
                    if (tcp.Client != null)
                    {
                        tcp.Client.Close();
                        tcp.Client = null;
                    }
                    tcp.Close();
                    tcp = null;
                }
            }
            return result;
        }

        public static byte[] utf16_gbk(string text)
        {
            //声明字符集   
            System.Text.Encoding utf16, gb2312;
            //utf16   
            utf16 = System.Text.Encoding.GetEncoding("UTF-16");
            //gb2312   
            gb2312 = System.Text.Encoding.GetEncoding("GBK");
            byte[] lvbytes = utf16.GetBytes(text);
            lvbytes = System.Text.Encoding.Convert(utf16, gb2312, lvbytes);
            return lvbytes;
        }

        #endregion
    }
}