Print raw data to a thermal-printer using .NET

Question

I\'m trying to print out raw ascii data to a thermal printer. I do this by using this code example: http://support.microsoft.com/kb/322091 but my printer prints always only

Answer 1

Okay, the reason for all that stuff is just the fact that I use an adapter because my computer does not has an old lpt port. I copied my application to an old computer running windows xp and everything works fine.

Now I have to hope that some other lpt2usb adaters I bought do their work correctly.

Edit 20.04.2010

With another lpt2usb adapter everything works fine now. If anyone is intersted in all the code I am using now, please contact me or comment here.

Answer 2

Quick step by step solution

Because code was not provided, I make it work with help of provided links, and here is the code:

Code

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);
}

Usage

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);

Sources:

• How to send raw data to a printer by using Visual C# .NET (link is no longer active)
• HOWTO: Send Raw Data to a Printer by Using the Win32 API