MQ

I've been struggling to get the size of a message property using MQINQMP

I preset the datalength field to -3
I use MQINQMP
If my valuelength is 64, and the message property is of length 20  I get datalength of 20.  Which is what I expect.  It works.

If my valuelength is 64, and the message property is of length 100, I get reason 2469: FAILED: MQRC_PROPERTY_VALUE_TOO_BIG
and the datalength is not set ( it stays at -3).

How do I get the length of the property, so I can allocate a buffer of the right size.    Is there a setting I need to use?

I'm on z/OS in a 64 bit C program.
The supplied sample CSQ4BCG1 works, but that's a 31 big program.

Colin

------------------------------
Colin Paice
------------------------------

Look at amqssbxa.c as one example. It has a default size, but if it gets TOO_BIG return code, it loops reallocating the buffer size using ReturnedName.VSLength until it succeeds.

That sample is on Distributed, but there might be a similar z/OS one - it would have to do the same technique.

------------------------------
Mark Taylor
Winchester
------------------------------

Original Message:
Sent: Tue May 10, 2022 07:38 AM
From: Colin Paice
Subject: How do I get the size of a message property

I've been struggling to get the size of a message property using MQINQMP

I preset the datalength field to -3
I use MQINQMP
If my valuelength is 64, and the message property is of length 20  I get datalength of 20.  Which is what I expect.  It works.

If my valuelength is 64, and the message property is of length 100, I get reason 2469: FAILED: MQRC_PROPERTY_VALUE_TOO_BIG
and the datalength is not set ( it stays at -3).

How do I get the length of the property, so I can allocate a buffer of the right size.    Is there a setting I need to use?

I'm on z/OS in a 64 bit C program.
The supplied sample CSQ4BCG1 works, but that's a 31 big program.

Colin

------------------------------
Colin Paice
------------------------------

I used the MQ provided sample CSQ4BCG1 which works, but when I compile it to be 64 bit, it fails with the same symptoms I as  getting ( dataLength not returned).
I'll ask to get a defect raised

------------------------------
Colin Paice
------------------------------

Original Message:
Sent: Tue May 10, 2022 08:21 AM
From: Mark Taylor
Subject: How do I get the size of a message property

Look at amqssbxa.c as one example. It has a default size, but if it gets TOO_BIG return code, it loops reallocating the buffer size using ReturnedName.VSLength until it succeeds.

That sample is on Distributed, but there might be a similar z/OS one - it would have to do the same technique.

------------------------------
Mark Taylor
Winchester

Original Message:
Sent: Tue May 10, 2022 07:38 AM
From: Colin Paice
Subject: How do I get the size of a message property

I've been struggling to get the size of a message property using MQINQMP

I preset the datalength field to -3
I use MQINQMP
If my valuelength is 64, and the message property is of length 20  I get datalength of 20.  Which is what I expect.  It works.

If my valuelength is 64, and the message property is of length 100, I get reason 2469: FAILED: MQRC_PROPERTY_VALUE_TOO_BIG
and the datalength is not set ( it stays at -3).

How do I get the length of the property, so I can allocate a buffer of the right size.    Is there a setting I need to use?

I'm on z/OS in a 64 bit C program.
The supplied sample CSQ4BCG1 works, but that's a 31 big program.

Colin

------------------------------
Colin Paice
------------------------------

I concur - seems to be a defect. I have recreated the same problem with a little sample C program I have to inquire a message property. When built 64-bit on z/OS, you don't get either of the lengths back when you get MQRC_PROPERTY_VALUE_TOO_BIG.

Cheers,
Morag

------------------------------
Morag Hughson
MQ Technical Education Specialist
MQGem Software Limited
Website: https://www.mqgem.com
------------------------------

Original Message:
Sent: Wed May 11, 2022 02:52 AM
From: Colin Paice
Subject: How do I get the size of a message property

I used the MQ provided sample CSQ4BCG1 which works, but when I compile it to be 64 bit, it fails with the same symptoms I as  getting ( dataLength not returned).
I'll ask to get a defect raised

------------------------------
Colin Paice

Original Message:
Sent: Tue May 10, 2022 08:21 AM
From: Mark Taylor
Subject: How do I get the size of a message property

Look at amqssbxa.c as one example. It has a default size, but if it gets TOO_BIG return code, it loops reallocating the buffer size using ReturnedName.VSLength until it succeeds.

That sample is on Distributed, but there might be a similar z/OS one - it would have to do the same technique.

------------------------------
Mark Taylor
Winchester

Original Message:
Sent: Tue May 10, 2022 07:38 AM
From: Colin Paice
Subject: How do I get the size of a message property

I've been struggling to get the size of a message property using MQINQMP

I preset the datalength field to -3
I use MQINQMP
If my valuelength is 64, and the message property is of length 20  I get datalength of 20.  Which is what I expect.  It works.

If my valuelength is 64, and the message property is of length 100, I get reason 2469: FAILED: MQRC_PROPERTY_VALUE_TOO_BIG
and the datalength is not set ( it stays at -3).

How do I get the length of the property, so I can allocate a buffer of the right size.    Is there a setting I need to use?

I'm on z/OS in a 64 bit C program.
The supplied sample CSQ4BCG1 works, but that's a 31 big program.

Colin

------------------------------
Colin Paice
------------------------------