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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using System.Text;
using System.IO;
using System.Drawing;
using System.Drawing.Printing;
using System.Runtime.InteropServices;

namespace BarCodePrintApi
{
public class RawPrinterHelper
{
// Structure and API declarions:
[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);

// SendBytesToPrinter()
// When the function is given a printer name and an unmanaged array
// of bytes, the function sends those bytes to the print queue.
// Returns true on success, false on failure.
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;
}

/// <summary>
/// 发送文件到打印机
/// </summary>
/// <param name="szPrinterName">打印机名称</param>
/// <param name="szFileName">文件</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;
}

/// <summary>
/// 发送字符串到打印机
/// </summary>
/// <param name="szPrinterName">打印机名称</param>
/// <param name="szString">指令</param>
/// <returns></returns>
public static bool SendStringToPrinter1(string szPrinterName, string szString)
{
IntPtr pBytes;
Int32 dwCount;
// How many characters are in the string?
dwCount = szString.Length;
// Assume that the printer is expecting ANSI text, and then convert
// the string to ANSI text.
//Encoding.GetEncoding("GB2312").GetBytes(szString);
pBytes = Marshal.StringToCoTaskMemAnsi(szString);

// Send the converted ANSI string to the printer.
SendBytesToPrinter(szPrinterName, pBytes, dwCount);
Marshal.FreeCoTaskMem(pBytes);
return true;
}
/// <summary>
/// 打印标签带有中文字符的ZPL指令
/// </summary>
/// <param name="printerName">打印机名称</param>
/// <param name="szString">指令</param>
/// <returns></returns>
public static string SendStringToPrinter(string printerName, string szString)
{
byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(szString); //转换格式
IntPtr ptr = Marshal.AllocHGlobal(bytes.Length + 2);
try
{
Marshal.Copy(bytes, 0, ptr, bytes.Length);
SendBytesToPrinter(printerName, ptr, bytes.Length);
return "success";
}
catch(Exception ex)
{
return ex.Message;
}
finally
{
Marshal.FreeCoTaskMem(ptr);
}
}

/// <summary>
/// 网络打印
/// </summary>
/// <param name="ip"></param>
/// <param name="port"></param>
/// <param name="szString"></param>
/// <returns></returns>
public static string SendStringToNetPrinter(string ip, int port, string szString)
{
try
{
//打开连接
System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient();
client.Connect(ip, port);

//写入zpl命令
System.IO.StreamWriter writer = new System.IO.StreamWriter(client.GetStream());
writer.Write(szString);
writer.Flush();

//关闭连接
writer.Close();
client.Close();

return "success";
}
catch (Exception ex)
{
return ex.Message;
}
}
}
}

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