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Rudolf · Posted: Mon Feb 28, 2005 5:04 am Post subject: MQRFH2 using Java for MQI

I have seen a lot of questions about how to add a MQRFH2 header using Java for MQI. You can of course have a look at the C examples or use DataOutputStream, but I have used Javolution (have a look at http://javolution.org/).

One of the things you can do is use class Struct as your base class and derive a struct like class from this base class, so e.g. for MQRFH2 this would be

public class MQRFH2 extends Struct {

public MQRFH2(ByteBuffer bb) {
setByteBuffer(bb, 0);
}

public Utf8String StructId = new Utf8String(4); /*
* Character set identifier of
* NameValueData
*/

public int Version; /* Structure version number */

public int StrucLength; /*
* 36 for fixed + some variable part */

public int Encoding; /*
* Numeric encoding of data that follows NameValueString
*/

public int CodedCharSetId; /*
* Character set identifier of data that follows
* NameValueString
*/

public Utf8String Format = new Utf8String(

; /*
* Format name of data that follows
* NameValueString
*/

public int Flags; /* Flags */

public int NameValueCCSID; /*
* Character set identifier of NameValueData
*/
}

In the constructor you pass a byte array that is wrapped by ByteBuffer (java.nio package). Now you can assign values to the class and the byte buffer will be automagically filled...

this exactly matches the C struct and you can write out this byte array to an MQMessage.

Kind regards,
Rudolf de Grijs