Java Code Examples for com.sun.jna.platform.win32.WinUser#INPUT

/**
 * Forcibly set focus to the given component
 *
 */
public static void requestForeground(Frame frame)
{
	// SetForegroundWindow can't set iconified windows to foreground, so set the
	// frame state to normal first
	frame.setState(Frame.NORMAL);

	User32 user32 = User32.INSTANCE;

	// Windows does not allow any process to set the foreground window, but it will if
	// the process received the last input event. So we send a F22 key event to the process.
	// https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setforegroundwindow
	WinUser.INPUT input = new WinUser.INPUT();
	input.type = new WinDef.DWORD(WinUser.INPUT.INPUT_KEYBOARD);
	input.input.ki.wVk = new WinDef.WORD(0x85); // VK_F22
	user32.SendInput(new WinDef.DWORD(1), (WinUser.INPUT[]) input.toArray(1), input.size());

	// Now we may set the foreground window
	WinDef.HWND hwnd = new WinDef.HWND(Native.getComponentPointer(frame));
	user32.SetForegroundWindow(hwnd);
}
 

public void pressKeys(final List<KeyboardKey> keys) {
    if (keys.isEmpty()) {
        return;
    }

    final WinUser.INPUT input = new WinUser.INPUT();
    final WinUser.INPUT[] inputs = (WinUser.INPUT[]) input.toArray(keys.size() * 2);

    final ListIterator<KeyboardKey> iterator = keys.listIterator();
    int index = 0;
    while (iterator.hasNext()) {
        setKeyDown(inputs[index], iterator.next());
        index++;
    }
    while (iterator.hasPrevious()) {
        setKeyUp(inputs[index], iterator.previous());
        index++;
    }

    user32.SendInput(new WinDef.DWORD(inputs.length), inputs, inputs[0].size());
}
 

/**
 * Create keyboard input event.
 *
 * @param character character to print
 * @param flags     flags
 * @return keyboard input event
 */
private static WinUser.INPUT createKeyboardInput(char character, long flags) {
    WinUser.INPUT input = new WinUser.INPUT();
    input.type = new WinDef.DWORD(WinUser.INPUT.INPUT_KEYBOARD);
    input.input.setType("ki");
    input.input.ki = new WinUser.KEYBDINPUT();
    input.input.ki.wVk = new WinDef.WORD(0);
    input.input.ki.wScan = new WinDef.WORD(character);
    input.input.ki.time = new WinDef.DWORD(0);
    input.input.ki.dwFlags = new WinDef.DWORD(flags);
    input.input.ki.dwExtraInfo = new BaseTSD.ULONG_PTR();
    return input;
}
 

/**
 * Enter a text by sending input events through the Windows API via JNA.
 *
 * @param text text to send through the Windows API
 * @throws WindowsException if the User32 library is not available or no events were processed
 * @see <a href="https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-sendinput">SendInput function</a>
 * @see <a href="https://stackoverflow.com/a/22308727">Using SendInput to send unicode characters beyond U+FFFF</a>
 */
private static void sendTextViaUser32(String text) throws WindowsException {
    if (StringUtils.isEmpty(text))
        return;
    if (USER32 == null)
        throw new WindowsException("User32 library was not loaded.");

    //final List<Long> pointers = new ArrayList<>();
    //noinspection EmptyFinallyBlock
    try {
        final List<WinUser.INPUT> events = new ArrayList<>();
        for (int i = 0; i < text.length(); i++) {
            final char c = text.charAt(i);
            //LOGGER.debug("printing " + c);
            events.add(createKeyboardInput(c, WinUser.KEYBDINPUT.KEYEVENTF_UNICODE));
            events.add(createKeyboardInput(c, WinUser.KEYBDINPUT.KEYEVENTF_KEYUP | WinUser.KEYBDINPUT.KEYEVENTF_UNICODE));
        }
        //for (WinUser.INPUT i : events) {
        //    long address = Pointer.nativeValue(i.getPointer());
        //    if (!pointers.contains(address)) pointers.add(address);
        //}

        WinUser.INPUT[] inputs = events.toArray(new WinUser.INPUT[0]);
        inputs = (WinUser.INPUT[]) inputs[0].toArray(inputs);
        //for (WinUser.INPUT i : inputs) {
        //    long address = Pointer.nativeValue(i.getPointer());
        //    if (!pointers.contains(address)) pointers.add(address);
        //}

        final WinDef.DWORD result = USER32.SendInput(
                new WinDef.DWORD(inputs.length), inputs, inputs[0].size());

        if (result.intValue() < 1) {
            LOGGER.error("last error: {}", Kernel32Util.getLastErrorMessage());
            throw new WindowsException("No events were executed.");
        }
        //LOGGER.debug("result: {}", result.intValue());
    } finally {
        //for (Long address : pointers) {
        //    Kernel32Util.freeLocalMemory(new Pointer(address));
        //}
    }
}
 

private void setKeyDown(final WinUser.INPUT input, final KeyboardKey key) {
    input.type.setValue(WinUser.INPUT.INPUT_KEYBOARD);
    input.input.setType(WinUser.KEYBDINPUT.class);
    input.input.ki.wVk = key.getVirtualKeyCode();
}
 

private void setKeyUp(final WinUser.INPUT input, final KeyboardKey key) {
    input.type.setValue(WinUser.INPUT.INPUT_KEYBOARD);
    input.input.setType(WinUser.KEYBDINPUT.class);
    input.input.ki.dwFlags.setValue(WinUser.KEYBDINPUT.KEYEVENTF_KEYUP);
    input.input.ki.wVk = key.getVirtualKeyCode();
}