Hi,

i should declare the dummy in the original c implementation ?

An other workaround would be to use a Pointer or Memory Object sized to the size of the greatest structure in the union - then parse the content out of the memory into the real structure as jna already does it...

I will try this and let you know

I have forgot to send the mail - so no second mail is necessary. I found a workaround which is quite useful.

I have changed the primary struct (which did contained the union) to the following public class iaxc_event_struct extends Structure { public static class ByValue extends iaxc_event_struct implements Structure.ByValue {} public Pointer next; public int type; public byte[] memory = new byte[1040];

}

So all possible struct data for the union gets into memory (a dummy buffer)

Second thing - I have subclassed Structure - and added function setMemory which makes useMemory public.

And in the callback - I do check for the type - then create the needed structure (which is now subclassed of my Structure subclass) - called setMemory with the parent structure .share function (with offset 8 - that is the next pointer and the int type) to point my structure to the right memory region. After that called read so that the fields get initialized - and voila - you can use it ;-)

Here is the callback - maybe code is clearer than my words ;-)

IAXClient.iaxc_ev_registration reg = new IAXClient.iaxc_ev_registration(); reg.setMemory(event.getPointer().share(8)); reg.read(); System.out.println("Event Event Raw: " + reg.toString());

Here is the subclassed Structure package org.callino.jiaxc;

import com.sun.jna.Pointer; import com.sun.jna.Structure;

public class GetStructure extends Structure {

/** * */ public void setMemory(Pointer m) { this.useMemory(m); }

Regards, Wolfgang