Re: Problem passing Array of Structs to external library

[Jussi Lahtinen <jussi.lahtinen@xxxxxxxxx>]

Some mistakes. Object instead of embedded array and wrong order if the
array.
See the attachment.


Jussi


On Wed, Apr 3, 2024 at 8:00 PM T Lee Davidson <t.lee.davidson@xxxxxxxxx>
wrote:

> I'm working with an external library that allows to pass an array of
> structures in the extra arguments of a variadic function.
> It does not work well with the array of structures that I try passing to
> it.
>
> With a C structure defined thusly:
>
> struct OptionItem
> {
>    int option;
>    intptr_t value;
>    void *ptr_value;
> };
>
> ... it does work if a C function passes the following as "ops":
>
> struct OptionItem ops[] = {
> { OPTION_CONNECTION_TIMEOUT, 31, NULL },
> { OPTION_CONNECTION_LIMIT, 21, NULL },
> { OPTION_CONNECTION_MEMORY_LIMIT, 11, NULL},
> { OPTION_END, 0, NULL }
> };
>
> Isn't that an array of structures?
>
> Strangely, if I pass it just a single structure (instead of an array), it
> does not complain but actually parses it.
>
> Perhaps I am misunderstanding how this should work.
>
> I have taken source code from that shared library and pared it down to
> create a small library that demonstrates the issue. It,
> with its source code, is included in the project which is attached.
>
> --
> Lee
>
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Attachment: TestCommandical-0.0.29-FIXED.tar.gz
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