Getting a message

This example demonstrates how to use the MQGET call to remove a message from a queue.

This extract is not taken from the sample applications supplied with IBM MQ .

     %INCLUDE SYSLIB(CMQP);
     %INCLUDE SYSLIB(CMQEPP);
     ⋮
/*********************************************************/
/* WORKING STORAGE DECLARATIONS                          */
/*********************************************************/
     DCL COMPCODE                  BINARY FIXED (31);
     DCL REASON                    BINARY FIXED (31);
     DCL HCONN                     BINARY FIXED (31);
     DCL HOBJ                      BINARY FIXED (31);
     DCL BUFFLEN                   BINARY FIXED (31);
     DCL DATALEN                   BINARY FIXED (31);
     DCL BUFFER                    CHAR(80);
⋮

/*********************************************************/
/* LOCAL COPY OF MESSAGE DESCRIPTOR AND                  */
/* GET MESSAGE OPTIONS                                   */
/*********************************************************/
     DCL 1 LMQMD  LIKE MQMD;
     DCL 1 LMQGMO LIKE MQGMO;
     ⋮
/*********************************************************/
/* SET UP MESSAGE DESCRIPTOR AS REQUIRED.                */
/* MSGID AND CORRELID IN MQMD SET TO NULLS SO FIRST      */
/* AVAILABLE MESSAGE WILL BE RETRIEVED.                  */
/*********************************************************/
     LMQMD.MSGID = MQMI_NONE;
     LMQMD.CORRELID = MQCI_NONE;
 
/*********************************************************/
/* SET UP GET MESSAGE OPTIONS AS REQUIRED.               */
/*********************************************************/
     LMQGMO.OPTIONS = MQGMO_NO_SYNCPOINT;
 
/*********************************************************/
/* SET UP LENGTH OF MESSAGE BUFFER.                      */
/*********************************************************/
     BUFFLEN = LENGTH(BUFFER);
/*********************************************************/
/*                                                       */
/* HCONN WAS SET BY PREVIOUS MQCONN REQUEST.             */
/* HOBJ WAS SET BY PREVIOUS MQOPEN REQUEST.              */
/*                                                       */
/*********************************************************/
 
     CALL MQGET (HCONN,
                 HOBJ,
                 LMQMD,
                 LMQGMO,
                 BUFFERLEN,
                 BUFFER,
                 DATALEN,
                 COMPCODE,
                 REASON);
 
/*********************************************************/
/* TEST THE COMPLETION CODE OF THE GET CALL.             */
/* IF THE CALL HAS FAILED ISSUE AN ERROR MESSAGE         */
/* SHOWING THE COMPLETION CODE AND THE REASON CODE.      */
/*********************************************************/
     IF COMPCODE ¬= MQCC_OK
        THEN DO;
          ⋮
          CALL ERROR_ROUTINE;
        END;

Parent topic: PL/I examples