Jump to content

Keylogger doesn't work properly when in chat box.

Recommended Posts

I have a keylogger code as following:

package com.key_logger_mod;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.client.event.InputEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import net.minecraft.client.Minecraft;
import org.lwjgl.glfw.GLFW;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.HashMap;
import java.util.Map;

@Mod.EventBusSubscriber(modid = "key_logger_mod", bus = Mod.EventBusSubscriber.Bus.FORGE, value = Dist.CLIENT)
public class KeyboardLogger {
    private static final Logger LOGGER = LogManager.getLogger();
    private static final Gson gson = new GsonBuilder().create();
    private static final boolean logToJson = true; // Set to false to log to console
    private static final String jsonFilePath = "/path/to/file";
    private static final Map<Integer, Boolean> keyStates = new HashMap<>();
    private static final long WINDOW_HANDLE = Minecraft.getInstance().getWindow().getWindow(); // Get the window handle

    static {

    private static void initializeLogFile() {
        Path path = Paths.get(jsonFilePath);
        try {
            Files.write(path, "[".getBytes(), StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
        } catch (IOException e) {
            LOGGER.error("Failed to initialize JSON file", e);

    public static void onKeyInput(InputEvent.Key event) {
        if (Minecraft.getInstance().level == null) return; // Only log if the player is in the game world

        long timestamp = System.currentTimeMillis();
        int key = event.getKey();
        int action = event.getAction();
        int mods = event.getModifiers();

        synchronized (keyStates) {
            if (action == GLFW.GLFW_PRESS) {
                if (!keyStates.getOrDefault(key, false)) {
                    keyStates.put(key, true);
                    logKeyAction(timestamp, key, "PRESS");
            } else if (action == GLFW.GLFW_RELEASE) {
                if (keyStates.getOrDefault(key, false)) {
                    keyStates.put(key, false);
                    logKeyAction(timestamp, key, "RELEASE");

    private static void logKeyAction(long timestamp, int key, String action) {
        KeyboardData keyboardData = new KeyboardData(timestamp, key, action);
        if (logToJson) {
            try {
                String jsonData = gson.toJson(keyboardData) + ",";
                Files.writeString(Paths.get(jsonFilePath), jsonData + System.lineSeparator(), StandardOpenOption.CREATE, StandardOpenOption.APPEND);
            } catch (IOException e) {
                LOGGER.error("Failed to write keyboard event to JSON file", e);
        } else {
            LOGGER.info("Timestamp: {}, Key: {}, Action: {}", timestamp, key, action);

    static class KeyboardData {
        long timestamp;
        int key;
        String action;

        KeyboardData(long timestamp, int key, String action) {
            this.timestamp = timestamp;
            this.key = key;
            this.action = action;

It works fine when players play normally, every key is registered. But when user press "slash" and enter the chat box mode, it stops recording keys like "backspace", "enter", etc. But still registering characters and number keys. Why is this happening?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.