发送原始数据打印不工作

Question

我想发送原始数据进行打印，避免选择打印机（快速打印）。

我正在尝试使用 Microsoft 提供的这个助手：https://support.microsoft.com/en-us/kb/322091#top

但是，当我调用方法时：

RawPrinterHelper.SendStringToPrinter(pd.PrinterSettings.PrinterName, s);

我的打印机开始工作（发出一些噪音）但它从来没有取出白纸并开始打印。

我已经用我的两台打印机试过了，两台打印机的行为是一样的。我也排除了打印机坏掉的可能性，因为我可以打印其他文档。

有什么问题吗？

Answer 1

试试这个：

using System;
using System.Drawing;
using System.Drawing.Printing;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;

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;
  }

  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;
  }

  public static bool SendStringToPrinter( string szPrinterName, string szString )
  {
    IntPtr pBytes;
    Int32 dwCount;

    // How many characters are in the string?
    // Fix from Nicholas Piasecki:
    // dwCount = szString.Length;
    dwCount = (szString.Length + 1) * Marshal.SystemMaxDBCSCharSize;

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

Answer 2

Fran_gg7，我最近遇到了同样的问题。首先，在打印机上打开文档的持久性。这将允许您查看打印机是否成功接收到打印请求。

您将在打印机队列中看到项目，它们将保留在那里。

在我的场景中，打印请求被正确地发送到打印机，但是我在激光打印机上测试它最终无法解释我传递给它的原始字符串数据。

我在可以理解 ZPL（zebra 编程语言）的标签打印机上测试了相同的输出，我通过了它并且 boom 它工作正常。

查看此内容以获得详细信息explanation

希望对您有所帮助。

Answer 3

如果使用 "RawPrinterHelper" 方法将纯文本打印到点阵，只有在我手动添加打印机、选择通用/纯文本并选择分配给我的 USB001 端口时，它才能正常工作USB 连接的打印机（在我的测试中为 okidata）。然后 RawPrinterHelper.SendStringToPrinter 会表现得非常像 'lpd to lpt1:'

Answer 4

如果您使用此处 https://support.microsoft.com/en-us/kb/322091#top 中的 MSDN 示例，但尝试使用字节数组而不是字符串或文件...这可能会有所帮助

public static void SendBytesToLocalPrinter(byte[] data, string printerName)
{
   var size = Marshal.SizeOf(data[0]) * data.Length;
   var pBytes = Marshal.AllocHGlobal(size);
   try
   {
      SendBytesToPrinter(printerName, pBytes, size);
   }
   finally
   {
      Marshal.FreeCoTaskMem(pBytes);
   }
}

这不会随着字节数组编码而改变。如果您尝试发送一些混合了一些二进制（即图像）数据的 utf8 编码字节序列，这将非常有用，就像我们团队的情况一样。

Answer 5

我的 ZEBRA ZD420 打印机出现了完全相同的问题。正在将 ZPL 字符串发送到打印机，但数据指示灯快速闪烁，但未打印。

我只改了

Marshal.StringToCoTaskMemAnsi(szString);
to 
Marshal.StringToCoTaskMemUTF8(szString);

而且有效！

发送原始数据打印不工作

Send raw data to print not working

.net

c#

printing