直接把结果输出到打印机

作者： 孟宪会 出自： 【孟宪会之精彩世界】 发布日期： 2003-6-15 22:49:57

下面的代码可以通过调用WIN32 API让你直接输出到打印机，因而可以达到最快的速度进行打印，而不是等待Windows的打印系统。此外，示例代码还说明了如何向打印机发送PCL代码。

// PrintDirect.cs
// 本文参考了Microsoft Support 文档号：Q298141
// 本代码假定你在file://192.168.1.101/hpl存在共享打印机
// 本代码示例了如何向打印机发送Hewlett Packard PCL5代码直接在页面中央打印出一个矩形。
using System;
using System.Text;
using System.Runtime.InteropServices;

[StructLayout( LayoutKind.Sequential)]
public struct DOCINFO
{
  [MarshalAs(UnmanagedType.LPWStr)]public string pDocName;
  [MarshalAs(UnmanagedType.LPWStr)]public string pOutputFile;
  [MarshalAs(UnmanagedType.LPWStr)]public string pDataType;
}

public class PrintDirect
{
  [ DllImport( "winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=false,
  CallingConvention=CallingConvention.StdCall )]
  public static extern long OpenPrinter(string pPrinterName,ref IntPtr phPrinter,
  int pDefault);
  [ DllImport( "winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=false,
  CallingConvention=CallingConvention.StdCall )]
  public static extern long StartDocPrinter(IntPtr hPrinter, int Level,
  ref DOCINFO pDocInfo);

  [ DllImport("winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=true,
  CallingConvention=CallingConvention.StdCall)]
  public static extern long StartPagePrinter(IntPtr hPrinter);
  [ DllImport( "winspool.drv",CharSet=CharSet.Ansi,ExactSpelling=true,
  CallingConvention=CallingConvention.StdCall)]
  public static extern long WritePrinter(IntPtr hPrinter,string data,
  int buf,ref int pcWritten);

  [ DllImport( "winspool.drv" ,CharSet=CharSet.Unicode,ExactSpelling=true,
  CallingConvention=CallingConvention.StdCall)]
  public static extern long EndPagePrinter(IntPtr hPrinter);

  [ DllImport( "winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=true,
  CallingConvention=CallingConvention.StdCall)]
  public static extern long EndDocPrinter(IntPtr hPrinter);

  [ DllImport("winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=true,
  CallingConvention=CallingConvention.StdCall )]
  public static extern long ClosePrinter(IntPtr hPrinter);
}

public class App
{
  public static void Main ()
  {
    System.IntPtr lhPrinter=new System.IntPtr();

    DOCINFO di = new DOCINFO();
    int pcWritten=0;
    string st1;

    // text to print with a form feed character
    st1="This is an example of printing directly to a printer\f";
    di.pDocName="my test document";
    di.pDataType="RAW";

    // the \x1b means an ascii escape character
    st1="\x1b*c600a6b0P\f";
    //lhPrinter contains the handle for the printer opened
    //If lhPrinter is 0 then an error has occured
    PrintDirect.OpenPrinter("\\\\192.168.1.101\\hpl",ref lhPrinter,0);
    PrintDirect.StartDocPrinter(lhPrinter,1,ref di);
    PrintDirect.StartPagePrinter(lhPrinter);
    try
    {
      // Moves the cursor 900 dots (3 inches at 300 dpi) in from the left margin, and
      // 600 dots (2 inches at 300 dpi) down from the top margin.
      st1="\x1b*p900x600Y";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);

      // Using the print model commands for rectangle dimensions, "600a" specifies a rectangle
      // with a horizontal size or width of 600 dots, and "6b" specifies a vertical
      // size or height of 6 dots. The 0P selects the solid black rectangular area fill.
      st1="\x1b*c600a6b0P";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);

      // Specifies a rectangle with width of 6 dots, height of 600 dots, and a
      // fill pattern of solid black.
      st1="\x1b*c6a600b0P";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);
      // Moves the current cursor position to 900 dots, from the left margin and
      // 1200 dots down from the top margin.
      st1="\x1b*p900x1200Y";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);
      // Specifies a rectangle with a width of 606 dots, a height of 6 dots and a

      // fill pattern of solid black.
      st1="\x1b*c606a6b0P";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);

      // Moves the current cursor position to 1500 dots from the left margin and
      // 600 dots down from the top margin.
      st1="\x1b*p1500x600Y";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);

      // Specifies a rectangle with a width of 6 dots, a height of 600 dots and a
      // fill pattern of solid black.
      st1="\x1b*c6a600b0P";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);
      // Send a form feed character to the printer
      st1="\f";
      PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);
    }
    catch (Exception e)
    {
      Console.WriteLine(e.Message);
    }

    PrintDirect.EndPagePrinter(lhPrinter);
    PrintDirect.EndDocPrinter(lhPrinter);
    PrintDirect.ClosePrinter(lhPrinter);
  }
}

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