Ok, I understand :)
Another question, how should I get access to the nested structures?,
some unmanaged functions need access to the structures..
---------------------------------------
int levels_callback (ev_levels input, ev_levels output){
......
}
int netstat_callback (ev_netstats stats){
......
}
int event_handler (event_struct e){
switch(e.type){
case EVENT_LEVELS:
return levels_callback(e.ev.levels.input,
e.ev.levels.output);
case EVENT_NETSTAT:
return netstat_callback(e.ev.netstats);
default:
return 0;
}
}
---------------------------------------
and the managed structure, may looks like this:
---------------------------------------
[StructLayout (LayoutKind.Explicit)]
public struct event_struct {
[FieldOffset(0)] public IntPtr next;
[FieldOffset(4)] public int type;
// ev_levels Union...
[FieldOffset(8)] public int ev_levels_input;
[FieldOffset(12)] public int ev_levels_output;
.
.
.
// ev_netstats Union...
[FieldOffset(8)] public int ev_netstats_No;
[FieldOffset(12)] public int ev_netstats_rtt;
}
---------------------------------------
can I create something like this ?
---------------------------------------
public struct new_event_struct : event_struct {
public ev_levels levels {
get { return ....; }
}
}
---------------------------------------
btw.... thanks for the help
On Mon, 2005-08-29 at 02:56, Robert Jordan wrote:
> 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 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 default marshaller cannot handle nested structs or unions.
> You have to break the struct into something the framework
> is able to handle:
>
> [StructLayout (LayoutKind.Explicit)]
> public struct event_struct
> {
> [FieldOffset(0)] public IntPtr next;
> [FieldOffset(4)] public int type;
> // first union
> [FieldOffset(8)] public float input;
> [FieldOffset(12)] public float output;
> // next union ...
> [FieldOffset(8)] public ...
> }
>
> The "next" ptr must be manually marshalled using Marshal.PtrToStructure.
>
> Rob
>
> _______________________________________________
> Mono-list maillist - [email protected]
> http://lists.ximian.com/mailman/listinfo/mono-list
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