JNA keylogger AJUDA [RESOLVIDO]

Programação Java
#1 

package key;

import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HMODULE;
import com.sun.jna.platform.win32.WinDef.LRESULT;
import com.sun.jna.platform.win32.WinDef.WPARAM;
import com.sun.jna.platform.win32.WinUser.HHOOK;
import com.sun.jna.platform.win32.WinUser.KBDLLHOOKSTRUCT;
import com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc;
import com.sun.jna.platform.win32.WinUser.MSG;

/**
 * Sample implementation of a low-level keyboard hook on W32.
 */
public class teste2 {
    private static volatile boolean quit;
    private static HHOOK hhk;
    private static LowLevelKeyboardProc keyboardHook;

    public static void main(String[] args) {
        final User32 lib = User32.INSTANCE;
        HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null);
        keyboardHook = new LowLevelKeyboardProc() {
            public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT info) {
                 	
            	if (nCode >= 0) { 
                    switch (wParam.intValue()) {
                        case User32.WM_KEYUP:
                        case User32.WM_KEYDOWN:
                        case User32.WM_SYSKEYUP:
                        case User32.WM_SYSKEYDOWN:
                            System.err.println("in callback, key=" + info.vkCode);
                            if (info.vkCode == 81) {
                                quit = true;
                            }
                    }
                }
                return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
            }
        };
        hhk = lib.SetWindowsHookEx(User32.WH_KEYBOARD_LL, keyboardHook, hMod, 0);
        System.out.println("Keyboard hook installed, type anywhere, 'q' to quit");
        //noinspection ConstantConditions
        new Thread() {
            public void run() {
                while (!quit) {
                    try {
                        Thread.sleep(10);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                System.err.println("unhook and exit");
                lib.UnhookWindowsHookEx(hhk);
                System.exit(0);
            }
        }.start();

        // This bit never returns from GetMessage

        MSG msg = new MSG();
        while ((lib.GetMessage(msg, null, 0, 0)) != 0) {
           
                lib.TranslateMessage(msg);
                lib.DispatchMessage(msg);
            
        }
        lib.UnhookWindowsHookEx(hhk); 
    } 
}

Este código funciona, só que esta capturando uma tecla quando é pressionada e quando é liberada

Alguém saberia me dizer como capturar somente quando a tecla é pressionada ?

#2

Resolvido, basta manipular o case

case User32.WM_KEYDOWN:

#3