6

我正在尝试将原始 ascii 数据打印到热敏打印机。我通过使用以下代码示例来做到这一点:http: //support.microsoft.com/kb/322091但我的打印机总是只打印一个字符,直到我按下换页按钮。如果我用记事本打印一些东西,打印机会自动进行换页,但不打印任何文本。

打印机通过 lpt2usb 适配器通过 USB 连接,Windows 7 使用“Generic -> Generic / Text Only”驱动程序。

有谁知道出了什么问题?怎么可能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:我如何发送它们?

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");

在我按下换页按钮后,此代码将返回一个“T”(这里的这个黑色小按钮: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

我现在在这里使用代码形式:c-sharpcorner.com/UploadFile/johnodonell/PrintingDirectlytothePrinter11222005001207AM/PrintingDirectlytothePrinter.aspx

我对其进行了一些修改,以便可以使用以下代码:

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);

这将只打印出一个“B”,但我希望是“BC” ,并且在运行任何代码后,我必须重新连接 USB 电缆以使其再次工作。有任何想法吗?

4

2 回答 2

8

快速分步解决方案

因为没有提供代码,所以我在提供的链接的帮助下使它工作,这里是代码:

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);
}

用法

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);

资料来源:

于 2013-12-01T18:57:57.003 回答
6

好的,所有这些东西的原因只是我使用适配器的事实,因为我的计算机没有旧的 lpt 端口。我将我的应用程序复制到一台运行 windows xp 的旧计算机上,一切正常。

现在我必须希望我购买的其他一些 lpt2usb 适配器能正常工作。

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,请在此处与我联系或发表评论。

于 2010-04-16T06:05:53.333 回答