Re: problems with generation of c# wrapper for c++ function with function ptr argument

On Wed, 19 Feb 2020 at 14:06, Carlos Frederico Biscaya <
[email protected]> wrote:

> Hi guys,
>
> I've started using swig a few months ago and after a few hickups had my
> first functioning c# wrapper. Now I need to create a wrapper in C# that
> wrapps a C++ function that takes a function ptr argument. I used a typedef
> for the function ptr type and the swig macro cs_callback that I found while
> researching how to get this done.
>
> Unfortunatelly I seem to be stuck now.
> AFAIK one of  two things should be happening, which aren't.
>
> 1) the delegate corresponding to my typedef for my function ptr is not
> generated anywhere
>
> typedef void (_stdcall *infobarObserverFunc)(InfoBarData*);
>
> 2) If I try using a typemap for inserting the delegate member into the
> generated class, nothing happens.
>
> I seem to be way out of my depth here and hope, someone can provide me
> with some insight as to what is going wrong. I've attached a minimal
> example that reproducibly gives me headaches and the swig project file
> needed. In my development environment I am using swig 4.0.1.
>
>
> I've tried using -E to see whether something suspicious show up after
> preprocessing.
>
>
cs_callback is not something shipped with SWIG, so I can't help you with
that. Generally, the suggestion is to use directors for callbacks which is
documented and there are C# examples, see Examples/csharp/callback and
Examples/charp/extend.

William

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