Re: Problem passing Array of Structs to external library

[T Lee Davidson <t.lee.davidson@xxxxxxxxx>]

On 4/3/24 18:20, Jussi Lahtinen wrote:
> Some mistakes. Object instead of embedded array and wrong order if the array.
> See the attachment.
>
>
> Jussi

Ah, I see. Got it. (And there the information was right there on the "Structure declaration" Wiki page which I obviously skimmed 
over too many times.)

It works great now.

Thank you, Jussi!


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

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