I am trying to use the callback functionality of JNA in order to call a function from a dll, which has a pointer to a function as one of the parameters. My approach is:

//C function definition void ANT_AssignChannelEventFunction(UCHAR ucChannel, CHANNEL_EVENT_FUNC pfChannelEvent, UCHAR *pucRxBuffer);

// C pointer function definition BOOL ChannelEventFunction(UCHAR ucChannel, UCHAR ucEvent) { Switch (ucEvent) { Case 0: Switch (ucChannel) { Case Channel_0: //defined and initialized beforehand // process received data which is in channel event Break; ... } Break; } }

//JNA implementation public interface ANT_MOD extends Library { ... public boolean _ANT_AssignChannelEventFunction(byte ucChannel, CHANNEL_EVENT_FUNCTION pfChannelEvent, String aucResponseBuf); ... }

public interface CHANNEL_EVENT_FUNCTION extends Callback { public boolean callback(byte ucChannel, byte ucEvent); }

...

public void initANT() { ... ant_mod = (ANT_MOD) Native.loadLibrary("ANT_DLL", ANT_MOD.class); final String aucResponseBuf = ""; boolean check = ant_mod._ANT_AssignChannelEventFunction(channel, new CHANNEL_EVENT_FUNCTION() { public boolean callback(byte ucChannel, byte ucEvent) { Switch (ucEvent) { Case 0: Switch (ucChannel) { Case Channel_0: //defined and initialized beforehand // process received data Break; ... } Break;

} return true; }, aucResponseBuf); ... }

I'm quite unsure about the correct procedure. Could somebody please let me know if this is the right way to do such callbacks. Thanks!