how to map callback Function with Java native access (JNA)

How can i set up windows hook with WH_FOREGROUNDIDLE and the following call back Functions

DWORD CALLBACK ForegroundIdleProc( __in int code, DWORD wParam, LONG lParam );

I am trying to detect when a thread/process goes idle.

开发者_高级运维I have obtained the threadProccessId by using the following functions:

GetForegroundWindow -> GetWindowThreadProcessId.

 public static interface ForegroundIdleProc extends Callback(){
   int invoke(int code, int wParam , NativeLong lParam);
 }

 /*....Usage....*/
 ForegroundIdleProc proc = new ForegroundIdleProc(){
   int invoke(int code, int wParam , NativeLong lParam){
      /* Handle callback */
       /*Make sure you define this function first.*/
       return NativeLibrary.Instance.CallNextHookEx(NULL , code , wParam , lParam);
   } 
 }

 NativeLibrary.Instance.SetWindowsHookEx(WH_FOREGROUNDIDLE , proc , etc etc);

EDIT: Added a return statement.

Extend StdCallCallback instead of Callback in order to get the callback called with the correct calling convention. Under win32 the macro "CALLBACK" usually resolves to _stdcall.