Re: [C400-L] calling RPG/ILE subprocedure

["Simon Coulter" <fbns@xxxxxxxxxxxxxxxxx>]

Hello Phil,

You wrote:
>Is it possible to call from a C pgm an ILE/RPG subprocedure which 
>returns a 20 position character?  When it returns I get a pointer error.  

Yes, it is possible, but not the way you are doing it.

>I tried returning the address with %addr(filename), which didn't end in 
>error but the value wasn't correct.

Probably because the storage referenced by the pointer is automatic 
storage and has gone after the procedure returns.

> char * getHist(char[], const char[]);

indicates a pointer is being returned, but

>D getHist         pi            20  

indicates a 20-byte field is being returned. Pointers and fields are not 
compatible (except in the rather restrictive sense that C uses pointers 
and strings).

You have two choices:

        1) Change the C prototype to accept a structure containing a 
char[20] field
        2) Define filename as STATIC in the RPG procedure and return the 
address of it.

My preference is for option 1.

Regards,
Simon Coulter.
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