/// <summary>
/// Receive message only and non-blocking queue
/// </summary>
/// <param name="consumer"></param>
/// <returns></returns>
public String ConvertMessageObjectToString(IMessage msg)
{
String msgStr = null;
if (msg != null)
{
if (msg is ITextMessage)
{
msgStr = ((ITextMessage)msg).Text;
/// NOTE: there are some null-terminated characters from ES and CCS, so need to convert to whitespaces; otherwise, the message is truncated
//msgStr = ((ITextMessage)msg).Text.Replace("\0", " ");
//byte[] bytes = Encoding.UTF8.GetBytes(((ITextMessage)msg).Text);
//msgStr = "text <" + Encoding.UTF8.GetString(bytes) + ">";
//msgStr = msg.GetIntProperty(XMSC.JMS_IBM_CHARACTER_SET) + " " + msg.GetIntProperty(XMSC.JMS_IBM_ENCODING) + " " + ((ITextMessage)msg).Text;
}
else if (msg is IBytesMessage)
{
int num = (int)((IBytesMessage)msg).BodyLength;
byte[] bytes = new byte[num];
((IBytesMessage)msg).ReadBytes(bytes);
msgStr = Encoding.UTF8.GetString(bytes);
}
msg.Acknowledge();
msg.ClearBody();
}
return(msgStr);
}
/// <summary>
/// less efficient version of receive message
/// </summary>
/// <returns></returns>
public String ReceiveMessage()
{
String msgStr = "";
IConnectionFactory connFactory = CreateMQConnectionFactoryWMQ();
using (IConnection conn = CreateMQConnection(connFactory)) // ensure Dispose() even with exceptions, similar to try-catch
{
using (ISession sess = CreateMQSession(conn))
{
using (IDestination dest = CreateMQDestination(sess, _consumerQueue))
{
using (IMessageConsumer consumer = CreateMQConsumer(sess, dest))
{
//using (receiveCompleteEvent = new System.Threading.AutoResetEvent(false)) // not using ASYNC way
//{
// MessageListener msgLsnr = new MessageListener(handleMessage);
// consumer.MessageListener = msgLsnr;
// conn.Start();
//}
conn.Start();
IMessage msg = null;
msg = consumer.ReceiveNoWait(); // non-blocking
//Console.WriteLine(msg) ;
if (msg != null)
{
if (msg is ITextMessage)
{
msg.SetIntProperty(XMSC.JMS_IBM_CHARACTER_SET, XMSC.CCSID_UTF8);
msg.SetIntProperty(XMSC.JMS_IBM_ENCODING, XMSC.WMQ_ENCODING_NATIVE);
msgStr = ((ITextMessage)msg).Text.Replace("\0", " "); // replace null-terminated characters to empty; otherwise, cannot display
// tbxOutput.AppendText(((ITextMessage)msg).Text);
}
else if (msg is IBytesMessage)
{
byte[] bytes = null;
int num = ((IBytesMessage)msg).ReadBytes(bytes);
msgStr = Encoding.UTF8.GetString(bytes);
// tbxOutput.AppendText(Encoding.UTF8.GetString(bytes));
}
msg.ClearBody();
}
else
{
msgStr = "nothing received.\n";
}
consumer.Close();
consumer.Dispose();
}
dest.Dispose();
}
sess.Close();
sess.Dispose();
}
conn.Stop();
conn.Close();
conn.Dispose();
} // close connection
return(msgStr);
}
