[Mono-list] Marshaling unmanaged structure

[Jonathan Pryor]

On Mon, 2005-08-29 at 01:13 -0500, Javier Diaz wrote:
> Hey all
> 
> I have an unmanaged structure that looks like this:
> 
> ------------------------------
> typedef struct event_struct {
>   struct event_struct *next;
>     int type;
>     union {
>        struct ev_levels  levels;
>        struct ev_text text;
>        struct ev_call_state call;
>        struct ev_netstats  netstats;
>        struct ev_url url;
>        struct ev_video video;
>        struct ev_registration reg;
>     } ev;
> } event;
> ------------------------------
> 
> I don't know how to wrap this structure, I know that the only posible
> way us by using the attribute [StructLayout (LayoutKind.Explicit]]
> and the attribute [FieldOffset (..)]
> 
> the structures that are inside the union are easy to wrap, they look like this:
> ------------------------------
> struct iaxc_ev_levels {
>   float input;
>   float output;
> };
> ------------------------------
> 
> Any ideas?

The attached example works for me.

Usage is:

	$ gcc -g -shared -o libunion.so union.c
	$ mcs union.cs
	$ LD_LIBRARY_PATH=`pwd` mono --debug union.exe

 - Jon

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