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MQSeries.net Forum Index » IBM MQ API Support » SendExit: Difference of subsequent segment from first one

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sfari
PostPosted: Wed Aug 04, 2004 3:15 am    Post subject: SendExit: Difference of subsequent segment from first one Reply with quote

Centurion

Joined: 15 Apr 2003
Posts: 144
I made a Java SendExit which sets the userId of the current J2EE session into the messages MQMD. The SendExit does this when a call has been identified as MQPUT (Value of byte 10 == x'86').

How can i differentiate if the data of a call is a subsequent segment? Byte 10 still indicates an MQPUT then, but of course there is no MQMD anymore to be modified.

I noticed that there are 44 bytes in front of the MQMD. I assume that the answer can be found in that part. Is there any documentation about that part available?

Thanks for any help!
Silvano
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sfari
PostPosted: Wed Aug 04, 2004 10:37 pm    Post subject: Reply with quote

Centurion

Joined: 15 Apr 2003
Posts: 144
Looking at the data buffer I found out, that the 11th byte of each segment indicates if a segment is the first one or not. Is this always true?

On the first segment this byte has the value 0x10 and on the subsequent segments 0x00.

Is this an adequate way to make this segmentation check?

Bytes of first segment:
Code:
54 53 48 20 00 00 7f fe 01 86 10 00 ...


Bytes of subsequent segment:
Code:
54 53 48 20 00 00 7f fe 01 86 00 00 ...
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