JNA GetMessage stops working after a short period?

[teslaa]

So I need to get Windows 10 touch screen events so I created the below code which registers the JFrame for windows message events. The code below successfully intercepts the WM_GESTURENOTIFY exactly how I want it however after a brief period of time anywhere between 1 second and 60 seconds it stops receiving Windows messages and I have to restart it. Any idea what I am doing wrong?

Thanks!

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package hmi.gui;

import java.util.Arrays;
import java.util.List;

import javax.swing.JFrame;

import com.sun.jna.Native;
import com.sun.jna.Structure;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef;
import com.sun.jna.platform.win32.WinDef.DWORD;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinDef.LPARAM;
import com.sun.jna.platform.win32.WinDef.LRESULT;
import com.sun.jna.platform.win32.WinDef.WPARAM;
import com.sun.jna.platform.win32.WinUser;
import java.awt.Color;
import java.awt.MouseInfo;
import javax.swing.JPanel;

public class TouchDetector {

    public static class CWPSSTRUCT extends Structure {

        public LPARAM lParam;
        public WPARAM wParam;
        public DWORD message;
        public HWND hwnd;

        @Override
        protected List getFieldOrder() {
            return Arrays.asList(new String[]{"lParam", "wParam", "message", "hwnd"});
        }
    }

    public interface WinHookProc extends WinUser.HOOKPROC {

        WinDef.LRESULT callback(int nCode, WinDef.WPARAM wParam, CWPSSTRUCT hookProcStruct);
    }

    public final class EventHookProc implements WinHookProc {

        public WinUser.HHOOK hhook;

        @Override
        public LRESULT callback(int nCode, WPARAM wParam, CWPSSTRUCT hookProcStruct) {
            if (nCode >= 0) {
                if (hookProcStruct.message.intValue() == 282) {

System.out.println("YOU JUST TOUCHED   x: " + MouseInfo.getPointerInfo().getLocation().x + "    y: " + MouseInfo.getPointerInfo().getLocation().y);

                }
            }

            return User32.INSTANCE.CallNextHookEx(hhook, nCode, wParam, hookProcStruct.getPointer());
        }
    }

    public static interface GetMsgProc extends WinUser.HOOKPROC {

        LRESULT callback(int nCode, WPARAM wParam, WinUser.MSG lParam);
    }
    
    public void init() {

        try {
            JFrame frame = new JFrame("TEST");
            frame.setSize(500, 500);
            frame.setVisible(true);
            JPanel panel = new JPanel();
            panel.setBackground(Color.red);
            frame.add(panel);

            // get the window handle for the main window/frame
            final HWND hwnd = new HWND();
            hwnd.setPointer(Native.getComponentPointer(frame));

            // clear the error value
            Native.setLastError(0);

            // retrieve the threadID associated with the main window/frame
            int windowThreadID = User32.INSTANCE.GetWindowThreadProcessId(hwnd, null);
            if (windowThreadID == 0) {
                int x = Native.getLastError();
                throw new IllegalStateException("error calling GetWindowThreadProcessId when installing machine-shutdown handler " + x);
            }

            final EventHookProc proc = new EventHookProc();

            proc.hhook = User32.INSTANCE.SetWindowsHookEx(4, new EventHookProc(), null, windowThreadID);

            if (proc.hhook == null) {
                int x = Native.getLastError();
                throw new IllegalStateException("error calling SetWindowsHookEx when installing machine-shutdown handler " + x);
            }
            System.out.println("Installed WIndows Event hook procedure");

        } catch (Exception e) {
            System.out.println(e);
        }

    }

    public static void main(String[] args) {
        TouchDetector h = new TouchDetector();
        h.init();
    }
}

[teslaa]

Ok seems I was not performing an unhook on app close which was causing problems on next run.