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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。
<![CDATA[// PrintDirect.cs<br />
// 本文参考了Microsoft Support 文档号：Q298141<br />
// 本代码假定你在file://192.168.1.101/hpl存在共享打印机<br />
// 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。</p>
<p>using System;<br />
using System.Text;<br />
using System.Runtime.InteropServices;</p>
<p>[StructLayout( LayoutKind.Sequential)]<br />
public struct DOCINFO<br />
{<br />
[MarshalAs(UnmanagedType.LPWStr)]public string pDocName;<br />
[MarshalAs(UnmanagedType.LPWStr)]public string pOutputFile;<br />
[MarshalAs(UnmanagedType.LPWStr)]public string pDataType;<br />
}</p>
<p>public class PrintDirect<br />
{<br />
[ DllImport( "winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=false,<br />
CallingConvention=CallingConvention.StdCall )]<br />
public static extern long OpenPrinter(string pPrinterName,ref IntPtr phPrinter,<br />
int pDefault);<br />
[ DllImport( "winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=false,<br />
CallingConvention=CallingConvention.StdCall )]<br />
public static extern long StartDocPrinter(IntPtr hPrinter, int Level,<br />
ref DOCINFO pDocInfo);</p>
<p> [ DllImport("winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=true,<br />
CallingConvention=CallingConvention.StdCall)]<br />
public static extern long StartPagePrinter(IntPtr hPrinter);<br />
[ DllImport( "winspool.drv",CharSet=CharSet.Ansi,ExactSpelling=true,<br />
CallingConvention=CallingConvention.StdCall)]<br />
public static extern long WritePrinter(IntPtr hPrinter,string data,<br />
int buf,ref int pcWritten);</p>
<p> [ DllImport( "winspool.drv" ,CharSet=CharSet.Unicode,ExactSpelling=true,<br />
CallingConvention=CallingConvention.StdCall)]<br />
public static extern long EndPagePrinter(IntPtr hPrinter);</p>
<p> [ DllImport( "winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=true,<br />
CallingConvention=CallingConvention.StdCall)]<br />
public static extern long EndDocPrinter(IntPtr hPrinter);</p>
<p> [ DllImport("winspool.drv",CharSet=CharSet.Unicode,ExactSpelling=true,<br />
CallingConvention=CallingConvention.StdCall )]<br />
public static extern long ClosePrinter(IntPtr hPrinter);<br />
}</p>
<p>public class App<br />
{<br />
public static void Main ()<br />
{<br />
System.IntPtr lhPrinter=new System.IntPtr();</p>
<p> DOCINFO di = new DOCINFO();<br />
int pcWritten=0;<br />
string st1;</p>
<p> // text to print with a form feed character<br />
st1="This is an example of printing directly to a printer/f";<br />
di.pDocName="my test document";<br />
di.pDataType="RAW";</p>
<p> // the /x1b means an ascii escape character<br />
st1="/x1b*c600a6b0P/f";<br />
//lhPrinter contains the handle for the printer opened<br />
//If lhPrinter is 0 then an error has occured<br />
PrintDirect.OpenPrinter("////192.168.1.101//hpl",ref lhPrinter,0);<br />
PrintDirect.StartDocPrinter(lhPrinter,1,ref di);<br />
PrintDirect.StartPagePrinter(lhPrinter);<br />
try<br />
{<br />
// Moves the cursor 900 dots (3 inches at 300 dpi) in from the left margin, and<br />
// 600 dots (2 inches at 300 dpi) down from the top margin.<br />
st1="/x1b*p900x600Y";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);</p>
<p> // Using the print model commands for rectangle dimensions, "600a" specifies a rectangle<br />
// with a horizontal size or width of 600 dots, and "6b" specifies a vertical<br />
// size or height of 6 dots. The 0P selects the solid black rectangular area fill.<br />
st1="/x1b*c600a6b0P";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);</p>
<p> // Specifies a rectangle with width of 6 dots, height of 600 dots, and a<br />
// fill pattern of solid black.<br />
st1="/x1b*c6a600b0P";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);<br />
// Moves the current cursor position to 900 dots, from the left margin and<br />
// 1200 dots down from the top margin.<br />
st1="/x1b*p900x1200Y";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);<br />
// Specifies a rectangle with a width of 606 dots, a height of 6 dots and a</p>
<p> // fill pattern of solid black.<br />
st1="/x1b*c606a6b0P";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);</p>
<p> // Moves the current cursor position to 1500 dots from the left margin and<br />
// 600 dots down from the top margin.<br />
st1="/x1b*p1500x600Y";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);</p>
<p> // Specifies a rectangle with a width of 6 dots, a height of 600 dots and a<br />
// fill pattern of solid black.<br />
st1="/x1b*c6a600b0P";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);<br />
// Send a form feed character to the printer<br />
st1="/f";<br />
PrintDirect.WritePrinter(lhPrinter,st1,st1.Length,ref pcWritten);<br />
}<br />
catch (Exception e)<br />
{<br />
Console.WriteLine(e.Message);<br />
}</p>
<p> PrintDirect.EndPagePrinter(lhPrinter);<br />
PrintDirect.EndDocPrinter(lhPrinter);<br />
PrintDirect.ClosePrinter(lhPrinter);<br />
}<br />
}<br />
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