Re: Binary bit map in IBM i (was as/400)

I wasn't thinking of a specific example - more that most of these kinds of things (like ISO 8583 processing) have been done before and invariably produce a number of packages/examples like this: https://github.com/ducminhgd/python-ISOMessage8583/blob/master/ISO8583/ISO8583.py <https://github.com/ducminhgd/python-ISOMessage8583/blob/master/ISO8583/ISO8583.py> which I found by doing a google search for "iso bitmap 8583 python code example" - substituting Java, PHP or node for python produces similar results.


I was mostly trying to make the point to the OP that we can't say what the "best way" to process the bitmap is without knowing _what_ they want to do with it.


Jon P

On Apr 19, 2023, at 11:52 AM, Alan Campin <alan0307d@xxxxxxxxx> wrote:

" And then of course you could always call PHP, Python, node from RPG to
perform the operation."

Can you point me to an example of doing this?

On Wed, Apr 19, 2023 at 8:43 AM Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

You can't map binary values to EBCDIC; it wouldn't help if you could.

You just need to use RPG's bitwise operations %BITxxx against the bitmap
field.

However - looking at the definition of ISO8583 bitmaps here:
https://en.wikipedia.org/wiki/ISO_8583 <
https://en.wikipedia.org/wiki/ISO_8583> it might be simpler to convert
the whole bitmap string to an array by repetitively dividing by zero. A
value of 1 indicating that the field in question is present.

It really depends on what you want to do. For example, using the %BITxxx
BIFs would be the most useful if you just want to know "does the message
include field x" and the division approach is better if you need to know
which fields need to be processed.

It is also possible that there is an underlying MI instruction that may be
surfaced that will perfomr the equivalent iof the array operation but I'm
not familiar with it.

And then of course you could always call PHP, Python, node from RPG to
perform the operation.

Why the heck in this day and age ISO are bothering with bitmaps is beyond
me but ...


Jon P.

On Apr 19, 2023, at 12:39 AM, krishna MAdiraju via RPG400-L <

rpg400-l@xxxxxxxxxxxxxxxxxx> wrote:

Hi, I am facing difficulty in reading binary bitmap in as/400.is

binary bitmap need to be converted to ebcidic?how ISO8583 BINARY BITMAP is
decoded in as/400

thankskrishnaM

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