java - Callback function pointer jna -

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so have native function in c declared int ngsetevent (int event, long callback). long callback represent callback function pointer. callback prototype declared int oncodeline(int code, int documentid, char *string). callback should registered method ngsetevent. problem how pointer function should long or nativelong? have tried lot of different aproaches none of them gave result. callback never invoked.

i have tried says in turn callback pointer in jna, no success. don't know try anymore. appreciated.

oncodeline 

public interface oncodeline extends callback {     int oncodeline (int code, int documentid, byte[] string); }

oncodelinestruct

public class oncodelinestruct extends structure {     public oncodeline onc;      @override     protected list getfieldorder() {         return arrays.aslist(new string[] { "onc" });     }  }

main class

oncodelinestruct oncodelinstruct; oncodelinstruct = new oncodelinestruct();             oncodelinstruct.onc = new oncodeline() {                 @override                 public int oncodeline(int code, int documentid, byte[] string) {                     system.out.println("this callback!");                     return 0;                 }             };  sbdll.ngsetevent(0, oncodelinstruct.getpointer().getnativelong(0));


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