RPG Programming in ILE

procedure names are resolved at bind time (that is, when you create static calls are faster than dynamic calls.

Static calls also allow

¹Operational descriptors

¹Omitted parameters

¹ The passing of parameters by value

¹ The use of return values

¹A greater number of parameters to be passed

Operational descriptors and omitted parameters can be useful when calli

bindable

APIs

or

procedures written in other ILE

languages.

 

For information

on

running

a

program refer to Chapter 9, “Running a Program”

page 103. For

information

on

program/procedure call,

refer to

Chapter 10,

Programs

and Procedures”

on

page 127.

 

 

Source Debugging

In ILE,

you

can perform source-level debugging

on any single- or mixed-l

ILE application.

The ILE source debugger also

supports

OPM programs. Yo

control

the

flow of

a program

by

using debug

commands

while the progra

running.

You

can

set

conditional

and

unconditional

job or

thread breakpoi

to running the program. After you call the program, you can then step

specified

number

of

statements, and display or change

variables. When

stops

because

of

a

breakpoint,

a step

command, or

a

run-time error, t

module

is

shown

on

the display

at

the

point where

the

program stopped

point,

you

can

enter

more debug

commands.

 

 

For information on the debugger, refer to Chapter 11, “Debugging Program page 163.

Bindable APIs

ILE offers a number of bindable APIs that can be used to supplement currently offered by ILE RPG. The bindable APIs provide program callin vation capability, condition and storage management, math functions, and d screen management.

Some APIs that you may wish to consider using in an ILE RPG application

¹ CEETREC – Signal the Termination-Imminent Condition

¹ CEE4ABN – Abnormal End

¹ CEECRHP – Create your own heap

¹ CEEDSHP – Discard your own heap

¹ CEEFRST – Free Storage in your own heap

¹ CEEGTST – Get Heap Storage in your own heap

¹ CEECZST – Reallocate Storage in your own heap

20 ILE RPG for AS/400 Programmer's Guide

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IBM AS/400 manual Source Debugging, Bindable APIs, While the progra
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AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.
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