Just curious, with the coming of Rest Services and how simple it makes
executing logic on the IBM i, is PCML obsolete? Why would you use PCML over
using a Rest Service?

On Thu, Oct 7, 2021 at 11:19 PM D*B <dieter.bender@xxxxxxxxxxxx> wrote:


PCML is made for people, who want to write java code, looking like rpg.
Thinking in rpg, you would have to do:
- write an rpg wrapper for your api, with the same parms as the api (one
- compile it with CRTBNDRPG PGMINFO(*PCML) and throw it away and delete
rpg source
- use the PCML to call the api, don't think about, how it works

Thinking in java, you would need some Javabeans, one for each
your api is using. This beans would be responsable to convert java
to a compound of binary bits and bytes. This beans would have java like
setXxx and getXxx methods, for each single component and the binary
rpg named this binary huddle datastructure (a funny name, isn't it?).
To call the Api, you would use ProgrammCall from jtopen.

a little example for such a bean would look like:

public class QualifiedName extends Converter {
private byte[] huddle;
private String name;
private String library;

public QualifiedName(String name, String library) {
huddle = new byte[20];

public byte[] getHuddle() {
return huddle;

public void setName(String name) {
this.name = name;
System.arraycopy(stringToAS400Text(name, 10), 0, huddle,
0, 10);

public void setLibrary(String library) {
this.library = library;
System.arraycopy(stringToAS400Text(library, 10), 0,
huddle, 10, 10);

getName, getLibrary and set Huddle would look very similar to the
corresponding methods in the example.
Datastructure is a Conveniance wrapper for the jtopen Objects to convert
types to java types and vice versa. The source could be found here:



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