Re: Convert C Prototype to RPG

Thanks for the refresh Barbara! I've used the old one for years, as I
struggled to get the Vertex product api's converted to RPG Prototypes.

For their part, Vertex does not directly support the use of their APIs
from RPG. They have shown no interest in this matter, which is really
unfortunate, since there's a huge need for a modern sales tax subsystem for
RPG shops. We've have pretty good luck getting this to work, but the
effort has been costly.

Thanks again,
-Eric DeLong

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Barbara Morris
Sent: Wednesday, September 18, 2013 5:45 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: Convert C Prototype to RPG

On 9/17/2013 6:44 PM, DeLong, Eric wrote:

Larry, even though C is asking for pointers, remember that RPG passes by

reference automatically. The net effect is that you simply define these as
very long character fields, and just pass the variable references normally.
There's a guide (Written by Barbara Morris) that covers some of the quirks
of converting C prototypes to RPG...

http://www.opensource400.org/callc.html

Don't use that one, it's way out of date. Use the one I list at the end
of this post.

D VprtXML PR EXTPROC('VprtXML')
D pConn * value
D pSession *
D pXmlBuf 65500a options(*varsize)
D pXmlResult 65500a options(*varsize)
D pResultSize 10I 0

I would use * VALUE OPTIONS(*STRING) for the pXmlBuf parameter, since
it's an input-only null-terminated string parameter. Larry, if you pass
pass a character string to that type of parameter, you don't have to
bother null-terminating it; the RPG compiler will handle the
null-termination.

Here's a much more up-to-date version of my "Converting C Prototypes to
RPG" document: https://ibm.biz/BdxQbC

(The long version of that URL is

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/We13116a562db_467e_bcd4_882013aec57a/page/Converting%20C%20Prototypes%20to%20RPG
)

--
Barbara
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