C programming

C programming

This section contains information to help we use the MQI from the C programming language.

Header files
Header files are provided to help you write C application programs that use the MQI.
Functions
You do not need to specify all parameters that are passed by address every time you invoke a function.
Parameters with undefined data type

Data types

Manipulating binary strings
Declare strings of binary data as one of the MQBYTEn data types.
Manipulating character strings
When the queue manager returns character data to the application, the queue manager always pads the character data with blanks to the defined length of the field; the queue manager does not return null-terminated strings.
Initial values for structures
The header files define various macro variables that we can use to provide initial values for the MQ structures when you declare instances of those structures.
Initial values for dynamic structures

Use from C++

Notational conventions
This information shows how to invoke the functions and declare parameters.
Parent topic: Introducing data types used in the MQI