Re: Prototype varying length field and *nopass

["Lim Hock-Chai" <Lim.Hock-Chai@xxxxxxxxxxxxxxx>]

Thanks Barbara.  I was out of office last week and not able to try it.  I'll put your suggestion to work.  Thanks 

________________________________

From: c400-l-bounces+lim.hock-chai=usamobility.com@xxxxxxxxxxxx on behalf of Barbara Morris
Sent: Fri 5/23/2008 3:09 PM
To: C400-L@xxxxxxxxxxxx
Subject: Re: [C400-L] Prototype varying length field and *nopass



Lim Hock-Chai wrote:
> I'm trying to create a c prototype for RPG procedure below.  I'm not
> sure how to do *nopass and varying length field.  Can somebody help?
>
> D logECD_STP3...                                                    
> D                 pr            15  0                               
> D  piModuleName                       like(logReffldSVLOGPF.LGMODULE)
> D                                     const                         
> D  piLocationID                       like(logReffldSVLOGPF.LGLOCID)
> D                                     const                         
> D  piLogMessage                       like(logReffldSVLOGPF.LGMSG)  
> D                                     const                         
> D  piByteRcv                    10i 0                               
> D                                     options(*nopass :*omit) const 
> D  piDataRcv                  2048    varying                       
> D                                     options(*nopass :*omit) const 

For the varying length field, you can use a struct:

typedef struct varying2048
{
    unsigned short l;
    char a[2048];
} varying2048_t;

In the C prototype, code ... to represent all the optional parameters.

To get %PARMS to work in the called procedure, you have to use #pragma
descriptor.

Something like this:

decimal(15,0) LOGECD_STP3
      (const whatever *moduleName,
       const whatever *locationId,
       const whatever *logmessage,
       ...);
#pragma descriptor(void LOGECD_STP3(void, void, void));

I would code EXTPROC('logECD_STP3') in the RPG prototype, so the C
version could be logECD_STP3.  You could also use #pragma map for the C
prototype.

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