MQI calls

Use this information to learn about calls in the Message Queue Interface (MQI).

MQCONN, MQCONNX, and MQDISC

Connect a program to (with or without options), and disconnect a program from, a queue manager. If you write CICS® programs for z/OS®, we do not need to use these calls. However, you are recommended to use them if you want to port our application to other platforms.

MQOPEN and MQCLOSE

Open and close an object, such as a queue.

MQPUT and MQPUT1

Put a message on a queue.

MQGET

Browse messages on a queue, or to remove messages from a queue.

MQSUB, MQSUBRQ

Register a subscription to a topic, and to request publications matching the subscription.

MQINQ

Inquire about the attributes of an object.

MQSET

Set some of the attributes of a queue. We cannot set the attributes of other types of object.

MQBEGIN, MQCMIT, and MQBACK

Use these calls when IBM MQ is the coordinator of a unit of work. MQBEGIN starts the unit of work. MQCMIT and MQBACK end the unit of work, either committing or rolling back the updates made during the unit of work. IBM i commitment controller is used to coordinate global units of work on IBM MQ for IBM i. Native start commitment control, commit, and rollback commands are used.

MQCRTMH, MQBUFMH, MQMHBUF, MQDLTMH

Create a message handle, convert a message handle to a buffer or a buffer to a message handle, and delete a message handle.

MQSETMP, MQINQMP, MQDLTMP

Set a message property on a message handle, inquire on a message property, and delete a property from a message handle.

MQCB, MQCB_FUNCTION, MQCTL

Register and control a callback function.

MQSTAT

Retrieve status information about previous asynchronous put operations.

See Call descriptions for a description of the MQI calls.