Administering Printer Settings in C# for Flexible Printing

using System;
using System.IO;
using System.Collections;
using PRNADMINLib;

namespace PrinterExample
{
    /// <summary>
    /// Example program will set the system default to print to a file.
    /// The command line will take a printer name, a file name, and a driver name
    /// to be used when a new printer is created.  If the specified printer or 
    /// port do not exist, then they will be created.
    /// </summary>
    public class PrinterExample
    {
        // Default Configuration
        private static string portfileName = "C:\\postscript.ps";
        private static string printerName = "TESTPRINTER";
        private static string newPrinterDriver = "HP DeskJet 1200C/PS";

        // Empty string object to specify local system in COM calls
        private static object oServerName = ""; // local system
 
        // Main program
        public static void Main(string[] args)
        {
            // Check arguments and set portfile name
            if (args.Length > 3)
            {
                Console.WriteLine("Usage: PrinterExample.exe [printer [filename [driver]]]");
                return;
            }

            if (args.Length > 0) printerName = args[0];
            if (args.Length > 1) portfileName = args[1];
            if (args.Length > 2) newPrinterDriver = args[2];

            // Check existence of portfile folder
            FileInfo portfileinfo = new FileInfo(portfileName);            
            DirectoryInfo portFolder = portfileinfo.Directory;
            if (!portFolder.Exists)
            {
                Console.WriteLine("Error: Portfile folder " + 
                    portFolder + " does not exist.");
                return;
            }

            // Get the normalized pathname
            portfileName = portfileinfo.FullName;

            // Get a reference to the printer subsystem
            PRNADMINLib.PrintMaster pMaster = new PRNADMINLib.PrintMasterClass();

            // Check existence of port
            PRNADMINLib.Port pPort = null;
            PRNADMINLib.PortCollection portColl = 
                (PRNADMINLib.PortCollection)pMaster.get_Ports(ref oServerName);
            IEnumerator portEnumerator = portColl.GetEnumerator();
            portEnumerator.Reset();
            while (portEnumerator.MoveNext())
            {
                PRNADMINLib.Port portCurrent = portEnumerator.Current as PRNADMINLib.Port;
                if (portCurrent.PortName == portfileName)
                {
                    pPort = portCurrent;
                    break;
                }
            }

            // Get reference to port or create it if it does not exist
            if (pPort == null)
            {
                pPort = new PRNADMINLib.PortClass();
                pPort.PortName = portfileName;
                pPort.PortType = 3;  // Simple local port
                pMaster.PortAdd(pPort);
            }

            // Check existence of printer
            PRNADMINLib.Printer pPrinter = null;
            PRNADMINLib.PrinterCollection prnColl = 
                (PRNADMINLib.PrinterCollection)pMaster.get_Printers(ref oServerName);
            IEnumerator prnEnumerator = prnColl.GetEnumerator();
            prnEnumerator.Reset();
            while (prnEnumerator.MoveNext())
            {
                PRNADMINLib.Printer prnCurrent = 
                    prnEnumerator.Current as PRNADMINLib.Printer;
                if (prnCurrent.PrinterName == printerName)
                {
                    pPrinter = prnCurrent;
                    break;
                }
            }

            // Get reference to printer and create it if it does not exist
            if (pPrinter == null)
            {
                // To add printer, name, driver, and port are required
                pPrinter = new PRNADMINLib.PrinterClass();
                pPrinter.PrinterName = printerName;
                pPrinter.DriverName = newPrinterDriver;
                pPrinter.PortName = pPort.PortName;
                pMaster.PrinterAdd(pPrinter);
            }
            else
            {
                // Make sure port is set on existing printer
                if (pPrinter.PortName != pPort.PortName)
                {
                    pPrinter.PortName = pPort.PortName;
                }
                // Driver cannot be re-set on existing printer
                if (args.Length == 3 && newPrinterDriver != pPrinter.DriverName)
                {
                    Console.WriteLine("Warning: Driver remains set to " + pPrinter.DriverName);
                }
                pMaster.PrinterSet(pPrinter);
            }
            
            // Set printer as system default
            pMaster.DefaultPrinter = pPrinter.PrinterName;

            // Print test page
            pMaster.PrintTestPage("", pPrinter.PrinterName);

            // Let us know what happened...
            Console.WriteLine("Results for " + printerName + ":");
            Console.WriteLine("    Port set to " + portfileName);
            Console.WriteLine("    Using driver \"" + pPrinter.DriverName + "\"");
            Console.WriteLine("    " + printerName + " set to default printer.");


        }
    }
}