POS for .NET

Question

Hi guys,

Have any of you had experience using Microsft POS for .Net? I'm trying to print on an EPSON TM U220 POS printer. But everytime I call PosPrinter.PrintNormal, I get an error saying "It is not initialized" and that's the only info I could get. I could print on the pos printer normally (via textpad or windows test print). I just can't get it to print from my .net Code. I'm not sure if I'm missing something.

Unfortunately, I have no luck googling the error. Here's the sample code I've been using.

            string strLogicalName = "PosPrinter";
            PosPrinter m_Printer = null;

            try
            {
                //Create PosExplorer
                PosExplorer posExplorer = new PosExplorer();
           
                DeviceInfo deviceInfo = null;
               
                try
                {
                    //DeviceCollection deviceCollection = posExplorer.GetDevices(DeviceType.PosPrinter);
                  
                    deviceInfo = posExplorer.GetDevice(DeviceType.PosPrinter,strLogicalName);
                   
                    // this call returns a valid object
                    m_Printer =(PosPrinter)posExplorer.CreateInstance(deviceInfo);
                   
                   
                }
                catch(Exception exception)
                {
                    ChangeButtonStatus();
                    return;
                }

                //Open the device
                m_Printer.Open();

                //Get the exclusive control right for the opened device.
                //Then the device is disable from other application.
                m_Printer.Claim(1000);

                //Enable the device.
                bool result = m_Printer.DeviceEnabled = true;

                // this call also causes the "It is not initialized" error
                //string health = m_Printer.CheckHealth(HealthCheckLevel.External);
            }
            catch(PosControlException)
            {
                ChangeButtonStatus();
            }

            try
            {
                //As using the PrintNormal method, send strings to a printer, and print it
                //[\n] is the standard code for starting a new line.

                // ************ ERROR OCCURS HERE ************* IT IS NOT INITIALIZED
                m_Printer.PrintNormal(PrinterStation.Receipt,"Hello OPOS for .Net\n");
            }
            catch(PosControlException exception)
            {
                MessageBox.Show(exception.ErrorCode.ToString());
            }