Thanks for the response to the previous question. I'm trying to create hooks for global mouse and keyboard events on both Mac and PC. Currently working on the keyboard part for the PC and do have questions about using JNA here.

I'm trying to install a hook using SetWindowsHookEx(WH_KEYBOARD_LL, .... but need to understand if the callback can be entirely in JNA or does it need to be in a separate DLL. If it can be entirely in JNA then what do you set HINSTANCE to? Also what should be the returned LRESULT value?

Here is what I have. It doesn't crash in any way, but neither does it respond to any keyboard events. (This is using the User32 call in JNA 3.0.5)

final User32 user32 = User32.INSTANCE;

HINSTANCE hInst = Kernel32.INSTANCE.GetModuleHandle(null);//?What is this really?;

HHOOK hHook = user32.SetWindowsHookEx(User32.WH_KEYBOARD_LL, new User32.LowLevelKeyboardProc() {

public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT lParam) {

System.out.println("nCode="+nCode);//Just print something to confirm the callback

//What should we return from here? Zero? CallNextHookEx?; return new LRESULT(0); } }, hInst, 0);

I did see a similar thread back in Nov. 2007 on this not the conclusion. Any advise is appreciated.