Add the below to make a new class RawPrinterHelper.
After installing the printer in Windows, use the EXACT printer name as shown in Windows, a document name to view in the Windows Print spooler, and the ZPL.
RawPrinterHelper.SendStringToPrinter("My USB Printer","Test Label Job 1","^XA^FO100,100^A0N,50,50^FDHello^FS^XZ");
To test, you can Pause the printer in its queue in Windows, then call the function. You should see the print job spooled in the queue and can then unPause to print just like any other normal print job. This works for all connection types and it doesn't even matter what actual driver you set up. For example, you can set up Generic, Text Only for any printer. But the port info you set up has to be correct. Hope it helps.
using System;
using System.Text;
using System.Runtime.InteropServices;
public struct DOCINFO
{
public string pDocName;
public string pOutputFile;
public string pDataType;
}
public class RawPrinterHelper
{
[DllImport("winspool.drv", CharSet = CharSet.Ansi, ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
public static extern long OpenPrinter(string pPrinterName, ref IntPtr phPrinter, int pDefault);
[DllImport("winspool.drv", CharSet = CharSet.Ansi, ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
public static extern long StartDocPrinter(IntPtr hPrinter, int Level, ref DOCINFO pDocInfo);
[DllImport("winspool.drv", CharSet = CharSet.Auto, 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, byte[] data, int buf, ref int pcWritten);
[DllImport("winspool.drv", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern long EndPagePrinter(IntPtr hPrinter);
[DllImport("winspool.drv", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern long EndDocPrinter(IntPtr hPrinter);
[DllImport("winspool.drv", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
public static extern long ClosePrinter(IntPtr hPrinter);
public static bool SendStringToPrinter(string printerName, string docname, string outputString)
{
bool bSuccess;
bSuccess = SendBytesToPrinter(printerName, docname, Encoding.ASCII.GetBytes(outputString));
return bSuccess;
}
public static bool SendBytesToPrinter(string printerName, string docname, byte[] byteData)
{
int dwError = 0;
int dwWritten = 0;
IntPtr hPrinter = new IntPtr(0);
DOCINFO di = new DOCINFO();
bool bSuccess = false;
di.pDocName = docname + Convert.ToByte(0);
di.pDataType = "RAW";
if (OpenPrinter(printerName, ref hPrinter, 0)!=0)
{
if (StartDocPrinter(hPrinter, 1, ref di)!=0)
{
if (StartPagePrinter(hPrinter)!=0)
{
bSuccess = (WritePrinter(hPrinter, byteData, byteData.Length, ref dwWritten)!=0);
EndPagePrinter(hPrinter);
}
EndDocPrinter(hPrinter);
}
ClosePrinter(hPrinter);
}
if (!bSuccess)
dwError = Marshal.GetLastWin32Error();
return bSuccess;
}
}