Parameters of the MQI calls

 

Parameters that are input-only and of type MQHCONN, MQHOBJ, or MQLONG are passed by value; for all other parameters, the address of the parameter is passed by value.

Not all parameters that are passed by address need to be specified every time a function is invoked. Where a particular parameter is not required, a null pointer can be specified as the parameter on the function invocation, in place of the address of the parameter data. Parameters for which this is possible are identified in the call descriptions.

No parameter is returned as the value of the function; in C terminology, this means that all functions return void.

The attributes of the function are defined by the MQENTRY macro variable; the value of this macro variable depends on the environment.

 

Parent topic:

Coding in C

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