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MQSeries.net Forum Index » General IBM MQ Support » How can I read message form MQ into Buffer?

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Vamsidhar
PostPosted: Mon Sep 17, 2001 6:10 am    Post subject: Reply with quote

Newbie

Joined: 16 Sep 2001
Posts: 1
Location: TDS Vamsidhar

Hello everybody,

I have a doubt on MQ-series. It is as follow. My queue is defined with Maximum message length of 100 MB. I want to process this message in my cobol program( please note that Cobol can have maximum buffer size of 16MB). Is mq supports that I can read the certain portion of the same message into one variable ( which I can define in my program with < 16MB). So that I can be in a loop to read the whole message till the end of it of ciurse I will overwrite the first read part when I am going to read the second part. As it seem to be reading the full message into one single buffer variable is impossible here in VS Cobol - II.
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RogerLacroix
PostPosted: Mon Sep 17, 2001 12:51 pm    Post subject: Reply with quote

Jedi Knight

Joined: 15 May 2001
Posts: 3258
Location: London, ON Canada

You cannot do that. You must get the whole message in one call. Therefore, for VS COBOL II, you are limited to 16MB messages.
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kolban
PostPosted: Mon Sep 17, 2001 7:38 pm    Post subject: Reply with quote

Grand Master

Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA

If you define the maximum message length of a message on a queue to be 16 MBytes I believe you can specify that the application that puts the messages can segment the messages into 16 MByte chunks. Thus if an application puts a 100 Mbyte message, it will be placed on the queue as 7 messages with each message having an incremening segment and offet number. You can loop through the messages retrieving individually by segment.
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RogerLacroix
PostPosted: Mon Sep 17, 2001 8:44 pm    Post subject: Reply with quote

Jedi Knight

Joined: 15 May 2001
Posts: 3258
Location: London, ON Canada

That only works, if the platform you are doing the gets / puts on supports the MQMD v2 header.

Since, we are talking about VS COBOL II (on MVS), I know that MQ v2.1 for OS/390 and earlier versions did not support MQMD v2 header.

Has anyone checked MQ v5.2 for OS/390 to see if it supports MQMD v2 header? (I don't think it is available).

later
Roger...
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