Re: Writing SRF

On Thu, Apr 29, 2010 at 8:08 PM, Martin Gainty <mgainty(at)hotmail(dot)com> wrote:
> it has been years since i've mucked in the C++ swamp but
> that means your (near) heap is ok but you're stack is hosed..
>
> probably specific to compiler (version) and Operating System(version) and
> environment settings..ping back if you are still experiencing those problems
> with those configuration settings
>
Ok, now it's working. In GNU/Linux with gcc 4.4.1, and I hope in
Windows XP too (it will be tested). Many thanks!

> Saludos Cordiales desde EEUU!
> Martin Gainty

¡Saludos desde España también!
Jorge

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>> From: jorgearevalo(at)gis4free(dot)org
>> Date: Thu, 29 Apr 2010 19:45:41 +0200
>> Subject: Re: [GENERAL] Writing SRF
>> To: tgl(at)sss(dot)pgh(dot)pa(dot)us
>> CC: pgsql-general(at)postgresql(dot)org
>>
>> On Thu, Apr 29, 2010 at 3:56 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> > Jorge Arevalo <jorgearevalo(at)gis4free(dot)org> writes:
>> >> Yes. For example, the function expects 2 arguments, and it's called
>> >> with 2 arguments: 1 composite type (following this format
>> >>
>> >> https://svn.osgeo.org/postgis/spike/wktraster/doc/RFC1-SerializedFormat)
>> >> and one integer. But PG_NARGS() returns a really big value (16297)
>> >> when I first check the number of arguments at the beginning of the
>> >> function. Has sense?
>> >
>> > Given only that data point, I would guess that you forgot to mark the
>> > function as being called with V1 protocol (PG_FUNCTION_INFO_V1).
>> >
>> >                        regards, tom lane
>> >
>>
>> Many thanks! That was one of my errors. Another one was this:
>>
>> char szDataPointer[10];
>> sprintf(szDataPointer, "%p", a_pointer);
>>
>> These lines caused a memory error. I changed them for:
>>
>> char * pszDataPointer;
>> pszDataPointer = (char *)allocator(10 * sizeof(char));
>> sprintf(pszDataPointer, "%p", a_pointer);
>>
>> Meaning "allocator" a memory allocator in a valid memory context for
>> PostgreSQL.
>>
>> And seems to work :-). Is the static memory "dangerous" in a
>> PostgreSQL memory context?
>>
>> Thanks again!
>> Jorge
>>
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