Hello Victor,
I think you're looking for something along these lines.
(with-foreign-object (proj :pointer)
(osr-export-to-proj-4 handle proj)
(let ((p (mem-ref proj :pointer)))
(write-line (foreign-string-to-lisp p))
(cpl-free p)))
Cheers,
Luís
(painstakingly typed on a phone)
On Tue, Jul 14, 2015, 14:37 Victor <bob...@ua.fm> wrote:
> Hi all,
>
> I don't know if it is the best place to ask this question, but I'll try
> it. I am trying to wrap around a following function:
>
> OGRErr OSRExportToProj4(OGRSpatialReferenceH r, char **buff);
>
> This function allocates the string and assigns it to the (char*) pointer
> passed as buff and then its contents should be copied into a C string and
> the obtained pointer released via CPLFree();
>
> So, basically, in C a typical usage would be:
>
> char *proj = NULL:
> OSRExportToProj4(handle, &proj);
> printf("%s\n", proj);
> CPLFree(proj);
>
> And the question is: how is this function should be wrapped with CFFI?
>
> Thanks,
> Victor
>
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> --
Luís
(sent from my phone)
