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 one character and this not until I press the form feed button. If I print something with notepad the printer will do a form feed automatically but without printing any text.
The printer is connected via usb over a lpt2usb adapter and Windows 7 uses the "Generic -> Generic / Text Only" driver.
Anyone knows what is going wrong? How is it possible to print some words and do some form feeds? Are there some control characters I have to send? And if yes: How do I send them?
Edit 14.04.2010 21:51
My code (C#) looks like this:
PrinterSettings s = new PrinterSettings();
s.PrinterName = "Generic / Text Only";
RawPrinterHelper.SendStringToPrinter(s.PrinterName, "Test");
This code will return a "T" after I pressed the form feed button (This litte black button here: swissmania.ch/images/935-151.jpg - sorry, not enough reputation for two hyperlinks)
Edit 15.04.2010 16:56
I'm using now the code form here: c-sharpcorner.com/UploadFile/johnodonell/PrintingDirectlytothePrinter11222005001207AM/PrintingDirectlytothePrinter.aspx
I modified it a bit that I can use the following code:
byte[] toSend;
// 10 = line feed
// 13 carriage return/form feed
toSend = new byte[1] { 13 };
PrintDirect.WritePrinter(lhPrinter, toSend, toSend.Length, ref pcWritten);
Running this code has the same effekt like pressing the form feed button, it works fine!
But code like this still does not work:
byte[] toSend;
// 10 = line feed
// 13 carriage return/form feed
toSend = new byte[2] { 66, 67 };
PrintDirect.WritePrinter(lhPrinter, toSend, toSend.Length, ref pcWritten);
This will print out just a "B" but I expect "BC" and after running any code I have to reconnect the USB cable to make it work agian. Any ideas?
Because code was not provided, I make it work with help of provided links, and here is the 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);
}
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);
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.
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