C# .NET MQ Code to Publish to a Topic

A couple of years ago, I posted a blog item called: C# .NET MQ Code to Subscribe to a Topic about subscribing to a topic using C# .NET code. I just realized that I never posted a C# .NET sample code to publish to a topic. So, here go – enjoy.

You can download the source code from here.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using IBM.WMQ;

/// <summary> Program Name
/// MQTest81
///
/// Description
/// This C# class will connect to a remote queue manager
/// and publish a message to a topic using a managed .NET environment.
///
/// Sample Command Line Parameters
/// -h 127.0.0.1 -p 1414 -c TEST.CHL -m MQA1 -t abc/xyz -u tester -x mypwd
/// </summary>
/// <author>  Roger Lacroix
/// </author>
namespace MQTest81
{
   public class MQTest81
   {
      private Hashtable inParms = null;
      private Hashtable qMgrProp = null;
      private System.String qManager;
      private System.String topicString;

      /*
      * The constructor
      */
      public MQTest81()
          : base()
      {
      }

      /// <summary> Make sure the required parameters are present.</summary>
      /// <returns> true/false
      /// </returns>
      private bool allParamsPresent()
      {
         bool b = inParms.ContainsKey("-h") && inParms.ContainsKey("-p") &&
                  inParms.ContainsKey("-c") && inParms.ContainsKey("-m") &&
                  inParms.ContainsKey("-t");
         if (b)
         {
            try
            {
               System.Int32.Parse((System.String)inParms["-p"]);
            }
            catch (System.FormatException e)
            {
               b = false;
            }
         }

         return b;
      }

      /// <summary> Extract the command-line parameters and initialize the MQ variables.</summary>
      /// <param name="args">
      /// </param>
      /// <throws>  IllegalArgumentException </throws>
      private void init(System.String[] args)
      {
         inParms = System.Collections.Hashtable.Synchronized(new System.Collections.Hashtable(14));
         if (args.Length > 0 && (args.Length % 2) == 0)
         {
            for (int i = 0; i < args.Length; i += 2)
            {
               inParms[args[i]] = args[i + 1];
            }
         }
         else
         {
            throw new System.ArgumentException();
         }

         if (allParamsPresent())
         {
            qManager = ((System.String)inParms["-m"]);
            topicString = ((System.String)inParms["-t"]);

            qMgrProp = new Hashtable();
            qMgrProp.Add(MQC.TRANSPORT_PROPERTY, MQC.TRANSPORT_MQSERIES_MANAGED);

            qMgrProp.Add(MQC.HOST_NAME_PROPERTY, ((System.String)inParms["-h"]));
            qMgrProp.Add(MQC.CHANNEL_PROPERTY, ((System.String)inParms["-c"]));

            try
            {
               qMgrProp.Add(MQC.PORT_PROPERTY, System.Int32.Parse((System.String)inParms["-p"]));
            }
            catch (System.FormatException e)
            {
               qMgrProp.Add(MQC.PORT_PROPERTY, 1414);
            }

            if (inParms.ContainsKey("-u"))
               qMgrProp.Add(MQC.USER_ID_PROPERTY, ((System.String)inParms["-u"]));

            if (inParms.ContainsKey("-x"))
               qMgrProp.Add(MQC.PASSWORD_PROPERTY, ((System.String)inParms["-x"]));

            logger("Parameters:");
            logger("  QMgrName ='" + qManager + "'");
            logger("  Topic String ='" + topicString + "'");

            logger("Connection values:");
            foreach (DictionaryEntry de in qMgrProp)
            {
               logger("  " + de.Key + " = '" + de.Value + "'");
            }
         }
         else
         {
            throw new System.ArgumentException();
         }
      }

      /// <summary> Connect, open topic, publish a message, close topic and disconnect. </summary>
      ///
      private void testPublish()
      {
         MQQueueManager qMgr = null;
         MQTopic publisher = null;
         int openOptions = MQC.MQOO_OUTPUT + MQC.MQOO_FAIL_IF_QUIESCING;
         MQPutMessageOptions pmo = new MQPutMessageOptions();
         System.String line = "This is a test message embedded in the MQTest81 program.";

         try
         {
            qMgr = new MQQueueManager(qManager, qMgrProp);
            logger("Successfully connected to " + qManager);

            publisher = qMgr.AccessTopic(topicString, null, MQC.MQTOPIC_OPEN_AS_PUBLICATION, openOptions);
            logger("Successfully opened " + topicString);

            // Define a simple MQ message, and write some text
            MQMessage sendmsg = new MQMessage();
            sendmsg.Format = MQC.MQFMT_STRING;
            sendmsg.MessageType = MQC.MQMT_DATAGRAM;
            sendmsg.MessageId = MQC.MQMI_NONE;
            sendmsg.CorrelationId = MQC.MQCI_NONE;

            // .NET defaults to 1200 which is Windows double byte
            // So, use 819 to get single byte character set.
            sendmsg.CharacterSet = 819;

            sendmsg.WriteString(line);

            // put the message on the outQ
            publisher.Put(sendmsg, pmo);
            logger("Message Data:> " + line);
         }
         catch (MQException mqex)
         {
            logger("CC=" + mqex.CompletionCode + " : RC=" + mqex.ReasonCode);
         }
         catch (System.IO.IOException ioex)
         {
            logger("Error: ioex=" + ioex);
         }
         finally
         {
            try
            {
               if (publisher != null)
               {
                  publisher.Close();
                  logger("Closed: " + topicString);
               }
            }
            catch (MQException mqex)
            {
               logger("CC=" + mqex.CompletionCode + " : RC=" + mqex.ReasonCode);
            }

            try
            {
               if (qMgr != null)
               {
                  qMgr.Disconnect();
                  logger("Disconnected from " + qManager);
               }
            }
            catch (MQException mqex)
            {
               logger("CC=" + mqex.CompletionCode + " : RC=" + mqex.ReasonCode);
            }
         }
      }

      private void logger(String data)
      {
         DateTime myDateTime = DateTime.Now;
         System.Console.Out.WriteLine(myDateTime.ToString("yyyy/MM/dd HH:mm:ss.fff") + " " + this.GetType().Name + ": " + data);
      }

      /// <summary> main line</summary>
      /// <param name="args">
      /// </param>
      //        [STAThread]
      public static void Main(System.String[] args)
      {
         MQTest81 write = new MQTest81();

         try
         {
            write.init(args);
            write.testPublish();
         }
         catch (System.ArgumentException e)
         {
            System.Console.Out.WriteLine("Usage: MQTest81 -h host -p port -c channel -m QueueManagerName -t topicString [-u userID] [-x passwd]");
            System.Environment.Exit(1);
         }
         catch (MQException e)
         {
            System.Console.Out.WriteLine(e);
            System.Environment.Exit(1);
         }

         System.Environment.Exit(0);
      }
   }
}

Regards,
Roger Lacroix
Capitalware Inc.