c# - 如何在 C# 中打印 PCL 文件？

Question

我有一个使用“打印到文件”生成的 PCL 文件。

在 C# 中以编程方式打印此文件的最佳方法是什么？

(当然，我要打印的打印机支持 PCL。)

我知道我可以通过从提示中调用来打印:

copy filename.pcl //location/printername

所以我想我也可以通过编程方式做同样的事情(使用复制)...我想知道是否有更简洁的方法来做到这一点，比如使用 PrintDocument。

请注意，当我使用 PrintDocument 时:

var pd = new PrintDocument
         {
             DocumentName = @"filename.pcl";
             PrinterSettings = {PrinterName = @"\\location\printername"}
         };

pd.Print();

我总是打印空白页。

Answer 1

很抱歉这么晚才回答这个问题，但我有一些代码可以完成这项工作。原来不是我写的。我从另一个程序员的帮助站点收到代码，但我不记得是哪一个。它工作得很漂亮。这是创建一个 dll 的项目。要自己动手，选择 Create:/Project/Class Library(在项目类型下选择 Visual C#)。

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;

namespace PrintRaw
{
   public class RawFilePrint
   {
      // 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 = "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);
            }
            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;

         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)
      {
         IntPtr pBytes;
         Int32 dwCount;
         dwCount = szString.Length;
         // Assume that the printer is expecting ANSI text, and then convert
         // the string to ANSI text.
         pBytes = Marshal.StringToCoTaskMemAnsi(szString);
         SendBytesToPrinter(szPrinterName, pBytes, dwCount);
         Marshal.FreeCoTaskMem(pBytes);
         return true;
      }
   }
}

现在，要使用此代码，请将生成的 dll 添加为项目的引用，然后根据需要调用函数。这是我今天使用它的一些代码:

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace PclFontTest
{
    class Program
    {
        static void Main(string[] args)
        {

            string szPrinterName = @"\\printserver\LaserJet 2420";

            StreamReader sr = new StreamReader(@"C:\Fonts\US20HP.FNT");
            string line = (char)27 + "*c32545D";
            line += sr.ReadToEnd();
            line += (char)27 + "*c5F";

            PrintRaw.RawFilePrint.SendStringToPrinter(szPrinterName, line);


        }
    }
}

此程序从文件中读取 PCL 字体。它用代码包装字体，为其分配字体 ID 32545，然后调用 dll 函数 SendStringToPrinter。