我正在尝试将原始ascii数据打印到热敏打印机。我通过使用此代码示例执行此操作:http://support.microsoft.com/kb/322091但我的打印机始终只打印一个字符,直到我按下换页按钮。如果我用记事本打印东西,打印机会自动进行换页,但不打印任何文字。
打印机通过usb通过lpt2usb适配器连接,Windows 7使用“Generic - > Generic / Text Only”驱动程序。
任何人都知道出了什么问题?如何打印一些单词并做一些换页?我必须发送一些控制字符吗?如果是的话:我该如何发送它们?
编辑14.04.2010 21:51
我的代码(C#)如下所示:
PrinterSettings s = new PrinterSettings();
s.PrinterName = "Generic / Text Only";
RawPrinterHelper.SendStringToPrinter(s.PrinterName, "Test");
按下换页按钮后,此代码将返回“T”(这里有一个黑色的按钮:swissmania.ch/images/935-151.jpg - 抱歉,两个超链接的声誉不够)
编辑15.04.2010 16:56
我现在在使用代码表格:c-sharpcorner.com/UploadFile/johnodonell/PrintingDirectlytothePrinter11222005001207AM/PrintingDirectlytothePrinter.aspx
我修改了一下,我可以使用以下代码:
byte[] toSend;
// 10 = line feed
// 13 carriage return/form feed
toSend = new byte[1] { 13 };
PrintDirect.WritePrinter(lhPrinter, toSend, toSend.Length, ref pcWritten);
运行此代码与按下换页按钮具有相同的效果,它工作正常!
但是这样的代码仍然不起作用:
byte[] toSend;
// 10 = line feed
// 13 carriage return/form feed
toSend = new byte[2] { 66, 67 };
PrintDirect.WritePrinter(lhPrinter, toSend, toSend.Length, ref pcWritten);
这将打印出一个“B”但我希望“BC”和在运行任何代码后我必须重新连接USB电缆以使其工作。有什么想法吗?
答案 0 :(得分:6)
因为没有提供代码,所以我在提供的链接帮助下工作,这里是代码:
using System;
using System.Runtime.InteropServices;
using System.Windows;
[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);
}
private void Print(String printerAddress, String text, String documentName) {
IntPtr printer = new IntPtr();
// A pointer to a value that receives the number of bytes of data that were written to the printer.
int pcWritten = 0;
DOCINFO docInfo = new DOCINFO();
docInfo.pDocName = documentName;
docInfo.pDataType = "RAW";
PrintDirect.OpenPrinter(printerAddress, ref printer, 0);
PrintDirect.StartDocPrinter(printer, 1, ref docInfo);
PrintDirect.StartPagePrinter(printer);
try {
PrintDirect.WritePrinter(printer, text, text.Length, ref pcWritten);
} catch (Exception e) {
Console.WriteLine(e.Message);
}
PrintDirect.EndPagePrinter(printer);
PrintDirect.EndDocPrinter(printer);
PrintDirect.ClosePrinter(printer);
}
String printerAddress = "\\\\ComputerName\\PrinterName";
String documentName = "My document";
String documentText = "This is an example of printing directly to a printer.";
this.Print(printerAddress,documentText,documentName);
答案 1 :(得分:5)
好吧,所有这些东西的原因只是我使用适配器的事实,因为我的电脑没有旧的lpt端口。我将我的应用程序复制到运行Windows XP的旧计算机上,一切正常。
现在我不得不希望我买的其他一些lpt2usb adater能正常工作。
编辑20.04.2010
使用另一个lpt2usb适配器现在一切正常。如果有人对我现在使用的所有代码感兴趣,请与我联系或在此发表评论。