MQI calls

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

MQCONN, MQCONNX, and MQDISC

Use these calls to 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, we are recommended to use them if we want to port the application to other platforms.

MQOPEN and MQCLOSE

Use these calls to open and close an object, such as a queue.

MQPUT and MQPUT1

Use these calls to put a message on a queue.

MQGET

Use this call to browse messages on a queue, or to remove messages from a queue.

MQSUB, MQSUBRQ

Use these calls to register a subscription to a topic, and to request publications matching the subscription.

MQINQ

Use this call to inquire about the attributes of an object.

MQSET

Use this call to 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

Use these calls to create a message handle, to convert a message handle to a buffer or a buffer to a message handle, and to delete a message handle.

MQSETMP, MQINQMP, MQDLTMP

Use these calls to 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

Use these calls to register and control a callback function.

MQSTAT

Use this call to retrieve status information about previous asynchronous put operations.

See Call descriptions for a description of the MQI calls.