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Roger Harman wrote:
I'd really like to see an article or other info on those OO
techniques.
Briefly consider a statement like:
report.object = rptOpen('XCD500');
Behind the scenes, rptOpen() creates a new instance of a report object
and returns a pointer to it. The object has a bunch of properties (an
integer for storing the number of pages, a string for storing the name
of the output stream file that's created, and so forth). One or more
HTML files associated with the report ID are loaded into memory, and
parsed into records and fields.
Since you never know how many records or fields there may be in an HTML
file, rptOpen() allocates memory dynamically for each, and links them
together in a chain (linked lists).
The pointer returned by rptOpen() becomes a basis for referencing every
other object in the chain.
In a program that generates multiple reports, you can call rptOpen()
multiple times. New report objects are dynamically instantiated with
each call.
rptClose() destroys all objects created by rptOpen() and frees related
memory.
The thought process may be somewhat non-traditional, but RPG is still
well suited for it.
Nathan.
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