CODEWITHSUNDEEP
cunixibm-mqaix
Cleankod
Cleankod

Reputation: 2340

MQGET big message ( > 4MB) from the queue results in error 2010

I am trying to receive the message from the queue using ANSI-C and MQGET function. The problem is that I always get error 2010 (MQRC_DATA_LENGTH_ERROR).

I found out that this error concerns parameter 7 of the MQGET call (DataLength). The message on my queue has 7157460 bytes. The channel I am using for MQGET has the "Maximum message length" set to 104857600 (as well as the queue holding the message).

I am even using the MQGET from this example: http://www.capitalware.biz/dl/code/c/msg2file.zip

And I still end up with error 2010. What am I doing wrong? Should I somehow increase the maximum size of the message in MQSERVER environment variable?

MQGET call:

/* ... */
MQLONG   messlen;            /* message length received       */

MQGET(Hcon,                  /* connection handle                 */
        Hobj,                /* object handle                     */
        &md,                 /* message descriptor                */
        &gmo,                /* get message options               */
        buflen,              /* pBuffer length                    */
        pBuffer,             /* pointer to message buffer         */
        &messlen,            /* message length                    */
        &CompCode,           /* completion code                   */
        &Reason);            /* reason code                       */

Upvotes: 4

Views: 8929

Answers (2)

Sayyed Basit
Sayyed Basit

Reputation: 49

for nodejs use below code.

const mq = require('ibmmq')
const MQC = mq.MQC

// Create default MQCNO structure
const cno = new mq.MQCNO()

// Add authentication via the MQCSP structure
var csp = new mq.MQCSP()
csp.UserId = process.env.MQ_USER
csp.Password = process.env.MQ_PASSWORD

// This line allows use of the userid/password
cno.SecurityParms = csp

// And use the MQCD to programmatically connect as a client
// First force the client mode
cno.Options |= MQC.MQCNO_CLIENT_BINDING

// And then fill in relevant fields for the MQCD
var cd = new mq.MQCD()
cd.ConnectionName = `${process.env.MQ_HOST}(${process.env.MQ_PORT})`
cd.ChannelName = `${process.env.MQ_CHANNEL}`

// Set the maximum message length to 100 MB (104857600 bytes)
cd.MaxMsgLength = 104857600; // 100 MB

Upvotes: 0

Cleankod
Cleankod

Reputation: 2340

I've got it! The answer is to use MQCONNX call to connect to queue manager.

Example:

#include <cmqxc.h>
/* ... */
MQCNO   mqcno = {MQCNO_DEFAULT} ; /* Connection options */
MQCD    mqcd  = {MQCD_CLIENT_CONN_DEFAULT};  /* Channel Defs */

/* ... */
mqcd.MaxMsgLength = 104857600L; /* 100 MB */

MQCONNX(mQueueManager.Name,
     &mqcno,
     &mQueueManager.ConnectionHandle,
     &mQueueManager.CompletionCode,
     &mQueueManager.ReasonCode);

It worked like a charm!

But please remember - if you find yourself needing to increase the maximum message size - think twice. There is probably something wrong with the design. In another words - MQ should not be used for transferring big messages. MQ File Transfer Edition is one of the solutions then.

Upvotes: 3

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