Differences Between OPM RPG/400 and ILE RPG

Running

1. The FREE

operation

is

not

supported

by

RPG

IV.

2. Certain

MCH

messages

may

appear in

the

job

log that do not appear

OPM (for example, MCH1202). The appearance of these messages does

indicate

a

change

in

the

behavior

of

the

program.

3.If you use the nonbindable API QMHSNDPM to send messages from your program, you may need to add 1 to the stack offset parameter to presence of the program-entry procedure in the stack. This will only case if the ILE procedure is the user-entry procedure, and if y

 

special

value

of '*'

for

the

call

message

queue

and a

value

of

gr

 

the

stack

offset.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4. ILE

RPG

does

not

interpret

return

codes

that are not 0 or 1 for

 

grams

or

procedures

that

end without

an

exception.

 

 

 

 

 

5. When

the

cancel

handler

for

an

ILE

RPG

program

receives

control,

it

the

system

return

code

to

2.

The

cancel

handler

for

an

OPM

RPG

p

does

not

modify

the

setting

of

 

the

system

return

code.

 

 

 

6.When recursion is detected, OPM RPG/400 displays inquiry message RPG8888. ILE RPG signals escape message RNX8888; no inquiry message is displayed for this condition. Note that this only applies to main pr Recursion is allowed for subprocedures.

7.If decimal-data errors occur during the initialization of a zoned-d packed-decimal subfield, then the reset values (those values use to

 

subfield

with

the

RESET

operation)

may

not

be

valid.

For

example,

it

 

that

the

subfield

was

not

initialized,

or that

it was

overlaid

on

 

subfield

of

a

different

type.

If a RESET operation is attempted

 

then

in

OPM

RPG/400,

a

decimal-data

error would occur. However, a

RESET

 

to

the

same

subfield

in ILE

RPG

will complete successfully; after t

 

the

subfield

has

the

same invalid value. As a

result,

attempts

to

 

will

get

a

decimal

data

error.

 

 

 

 

 

 

 

 

 

8. In

ILE

RPG,

positions

254-263

of

the

program

status

data structure

contain

the

user

name

of

the

originating

job.

In OPM RPG, these po

reflect

the

current

user

profile.

The

current

user

profile in

ILE

found

in positions

358-367.

 

 

 

 

 

 

 

 

 

 

 

Debugging and Exception

Handling

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. The

DEBUG

operation

 

is not supported in RPG IV.

 

 

 

 

 

 

2. You

cannot

use

RPG

tags, subroutine names, or points

in

the

cycle

*GETIN and *DETC for setting breakpoints when using the ILE source

 

debugger.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Function

checks

 

are

normally

left

in the job log by

both

OPM

RPG

an

RPG.

However,

in

ILE

 

RPG, if you

have

coded an

error

indicator,

'E

or

*PSSR

error

routine,

then

the

function check will not appear.

 

You

should

remove

any

code

that

deletes function

checks,

since the

of

the

indicator,

'E'

 

extender,

or

*PSSR

will prevent

function

checks

 

ring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

374 ILE RPG for AS/400 Programmer's Guide

Page 397 Page 399
Page 398
Image 398
IBM AS/400 manual Running, Debugging and Exception
Page 397 Page 399

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.
Top Page Image Contents