Is it possible to disable windows keys using java

Question

can disable windows and alt + tab keys with java ...

Answer 1

You can use JNA to achieve this.

Include jna.jar and platform.jar in the classpath and create the next class. This class disables the left window key (0x5B) and the right window key (0x5C). This way you can add other codes to the case switch statement.

Call KeyHook.blockWindowsKey () as soon as possible when your application starts. On the other hand, call unblockWindowsKey () when the application terminates.

Since code is only executed when isWindows () is true, you can always call KeyHook.blockWindowsKey () even when working on another OS.

    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;


    public class KeyHook {
        private static HHOOK hhk;
        private static LowLevelKeyboardProc keyboardHook;
        private static User32 lib;

        public static void blockWindowsKey() {
            if (isWindows()) {
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        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 (info.vkCode){
                                        case 0x5B:
                                        case 0x5C:
                                            return new LRESULT(1);
                                        default: //do nothing
                                    }
                                }
                                return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
                            }
                        };
                        hhk = lib.SetWindowsHookEx(13, keyboardHook, hMod, 0);

                        // This bit never returns from GetMessage
                        int result;
                        MSG msg = new MSG();
                        while ((result = lib.GetMessage(msg, null, 0, 0)) != 0) {
                            if (result == -1) {
                                break;
                            } else {
                                lib.TranslateMessage(msg);
                                lib.DispatchMessage(msg);
                            }
                        }
                        lib.UnhookWindowsHookEx(hhk);
                    }
                }).start();
            }
        }

        public static void unblockWindowsKey() {
            if (isWindows() && lib != null) {
                lib.UnhookWindowsHookEx(hhk);
            }
        }

        public static boolean isWindows(){
            String os = System.getProperty("os.name").toLowerCase();
            return (os.indexOf( "win" ) >= 0);
        }
    }