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
D VprtXML PR EXTPROC('VprtXML')
D pConn * value
D pSession *
D pXmlBuf 65500a options(*varsize)
D pXmlResult 65500a options(*varsize)
D pResultSize 10I 0
To make this work, lets create your local vars... Making assumptions as to the size of the vars to define...
D ConnHdl S *
D SessHdl S *
D BufferIN S 4096a
D BufferOUT S 4096a
D BufferOUTSize S 10i 0 Inz(%size(BufferOUT))
/free
ConnHdl = SomeFunctionToOpenConnection();
VprtXML( ConnHdl : SessHdl
: BufferIN : BufferOUT : BufferOUTSize);
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Larry Moore
Sent: Tuesday, September 17, 2013 4:05 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: RE: Convert C Prototype to RPG
Thanks Eric. I was unable to find the size of the xml fields in the H
file and Vertex says it can be whatever size I need it.
"It is whatever size the caller creates it as.
The program which calls VprtXML creates pXmlBuf, of whatever
size should seem sufficient to hold the input request. The input XML is
delimited with a hex 0x00 character (the null character) at the
tail end."
The fields are pointers so I assume that I just pass the size of my
field to the api. If the prototype is incorrect will the program
compile and run without errors? I'm able to call the api but it returns
no results and there are no messages in the joblog. I'm not sure if
it's an issue with the prototype or if I'm just not passing the correct
data to the api.
Here's how I have it defined:
D VprtXML PR EXTPROC('VprtXML')
D pConn * value
D pSession *
D pXmlBuf * value
D pXmlResult *
D pResultSize 10I 0
Thanks
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of DeLong, Eric
Sent: Monday, September 16, 2013 5:01 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: RE: Convert C Prototype to RPG
Larry,
I don't work with that particular product, but I do work with a C-based
product from Vertex... My rpg prototypes for these C functions follow a
pattern more like this...
Connection handles are usually just pointers, as it appears is the
session handle... Session handle is expected to be I/O, so you cannot
use Const or Value... I have had some odd issues with CWIDEN, so my
prototypes do not use this feature. I believe Vertex typically write
their APIs to use FIXED STORAGE LENGTHS for character data, so it's
imperative to declare your local storage for passing Character data to
be of the length specified in the Vertex C include member. They
typically have some constants defined for the "storage length" used for
character data fields. Check your C prototypes in the product's H file.
If the field is expected to pass 30 bytes, the C prototype typically
defines the storage length to be 31. I presume this is one extra byte
initialized to null character (x'00) so that their functions will accept
fixed length OR varying length C Character strings...
Here's my take on your prototype...
D VprtXML PR EXTPROC('VprtXML')
D pConn * value
D pSession *
D pXmlBuf 65500a
D pXmlResult 65500a
D pResultSize 10I 0
The sizing of the xml fields is unknown, so those may need to be sized
differently depending on the C includes specifying a storage length for
these.
Hope I didn't get this too wrong, but without seeing the H includes,
it's nearly impossible to clarify...
Hth,
-Eric DeLong
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Larry Moore
Sent: Monday, September 16, 2013 2:20 PM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: Convert C Prototype to RPG
I need to interface our payroll program with Vertex Q Series payroll tax
software. The Vertex functions are written in C and our payroll programs
are in RPG. I am not proficient in the C language and Vertex support
doesn't know RPG so I'm struggling to prototype their functions in my
program. Has anyone integrated with Vertex using their Enhance
Integration XML api's?
Here's the definition of one of their functions:
Parameter Use Description
---------- ----
-----------------------------------------
lConnHdl I The connection
handle returned from VprtOpenPRT
Session I/O Pointer to the
session handle, which will hold the context for this session. Should be
initialized to NULL before the first call.
XmlBuf I Character string
containing XML request
XmlResult O Pointer to character
string where the result will be stored
pResultSize I On input, the size of
the XmlResult buffer
PREFIX int POSTFIX VprtXML(tVprtConn lConnHdl, void **pSession, char
*XmlBuf, char *XmlResult, long *pResultSize);
Here's an example of what I tried but it doesn't appear to be correct
because nothing happens when I execute. Any suggestions? I am able to
open a connection to the database and create the connection handle using
another api.
D VprtXML PR EXTPROC(*CWIDEN: 'VprtXML')
D pConn * value options(*string)
D pSession * value options(*string)
D pXmlBuf * value options(*string)
D pXmlResult * value options(*string)
D pResultSize 10I 0
xml = '<QUERY> ' +
'<PAYDATE>20130901</PAYDATE> ' +
'<GEOSTATE>39</GEOSTATE> ' +
'<GEOCNTY>129</GEOCNTY> ' +
'<GEOCITY>2560</GEOCITY> ' +
'<TAXID>537</TAXID> ' +
'<GET> ' +
'<TAXNAMES/> ' +
'</GET> ' +
'</QUERY>' + NULL;
xml = cvtCCSID( xml: 819: NULL);
pConnection = %addr(lConHnd);
pSession = %addr(session);
pXmlBuf = %addr(xml);
VprtXML(pConnection: pSession: pXmlBuf: pXmlResult:
pResultSize);
Thanks,
Larry Moore * Covenant Transportation Group * Systems Analyst *
423.463.3374
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