Java jnativehook 输入字符串无效

Question

我想在键入 ALT+A 时键入：“/ammo”。该程序运行但似乎在运行之后立即停止：我按 alt+A 或 A，代码什么也没做。

package jnativehook01;

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.KeyEvent;

import org.jnativehook.GlobalScreen;
import org.jnativehook.NativeHookException;
import org.jnativehook.keyboard.NativeKeyEvent;
import org.jnativehook.keyboard.NativeKeyListener;

public class Example implements NativeKeyListener {
    public void nativeKeyPressed(NativeKeyEvent e) {

        if (NativeKeyEvent.getKeyText(e.getKeyCode()).equals("A")) {
            try {
                GlobalScreen.unregisterNativeHook();

                Robot bot;
                try {
                    bot = new Robot();

                    String text = "/ammo";
                     StringSelection stringSelection = new StringSelection(text);
                     Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                     clipboard.setContents(stringSelection, stringSelection);

                    //type: /ammo
                    bot.keyPress(KeyEvent.VK_T);
                    bot.keyRelease(KeyEvent.VK_T);


                } catch (AWTException e1) {

                }




            } catch (NativeHookException e1) {
            }
        }
    }

    public void nativeKeyReleased(NativeKeyEvent e) {
        System.out.println("Key Released: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
    }

    public void nativeKeyTyped(NativeKeyEvent e) {
        System.out.println("Key Typed: " + e.getKeyText(e.getKeyCode()));
    }

    public static void main(String[] args) {

        new Example();
    }
}

Answer 1

好的，现在可以使用了：

package jnativehook01;

import org.jnativehook.GlobalScreen;
import org.jnativehook.NativeHookException;
import org.jnativehook.keyboard.NativeKeyEvent;
import org.jnativehook.keyboard.NativeKeyListener;
import java.util.logging.*;
import java.awt.AWTException;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.KeyEvent;
import java.awt.event.InputEvent;

public class Example implements NativeKeyListener {
    public void nativeKeyPressed(NativeKeyEvent e) {
        if (NativeKeyEvent.getKeyText(e.getKeyCode()).equals("A")) {
            Robot bot;
            try {
                String text = "/ammo";
                StringSelection stringSelection = new StringSelection(text);
                Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                clipboard.setContents(stringSelection, stringSelection);

                bot = new Robot();

                for (int i = 0; i < 10; i++) {
                    //t
                    bot.keyPress(KeyEvent.VK_T);
                    bot.delay(100);
                    bot.keyRelease(KeyEvent.VK_T);

                    bot.delay(500);

                    bot.keyPress(KeyEvent.VK_CONTROL);
                    bot.keyPress(KeyEvent.VK_V);
                    bot.keyRelease(KeyEvent.VK_V);
                    bot.keyRelease(KeyEvent.VK_CONTROL);

                    bot.delay(500);

                    //Enter

                    bot.keyPress(KeyEvent.VK_ENTER);
                    bot.keyRelease(KeyEvent.VK_ENTER);

                    bot.delay(1000);

                    bot.keyPress(KeyEvent.VK_ENTER);
                    bot.keyRelease(KeyEvent.VK_ENTER);

                    bot.delay(400);
                }

            } catch (AWTException e1) {
            }

        }
    }

    public void nativeKeyReleased(NativeKeyEvent e) {

    }

    public void nativeKeyTyped(NativeKeyEvent e) {

    }

    public static void main(String[] args) {
        Example ex = new Example();
        try {
            GlobalScreen.registerNativeHook();
            Logger logger = Logger.getLogger(GlobalScreen.class.getPackage().getName());
            logger.setLevel(Level.OFF);
        } catch (NativeHookException eb) {
            System.out.println(eb.getMessage());

        }
        GlobalScreen.addNativeKeyListener(ex);
    }

}

Answer 2

您的代码仍有一些问题。

if (NativeKeyEvent.getKeyText(e.getKeyCode()).equals("A")) { 这不是检查 A 密钥的正确方法。这将检查 AWT 是否为该键生成 ascii 'A'。这些值可以在运行时被 JVM 覆盖。您应该检查 NativeKeyEvent.VK_A 常量。您也无法检查该键事件上的 ALT 标志。类似下面的内容更符合您的要求。

if (e.getKeyCode() == NativeKeyEvent.VC_A && e.getModifiers() & NativeInputEvent.ALT_MASK) {

关于线程安全的说明。您在键回调中依赖 AWT，但是，该库默认情况下不使用 AWT 来分派事件。您需要查看 wiki 的 Thread Safety 部分以获取线程安全示例。

为了方便，您可以选择将Robots class替换为GlobalScreen.postNativeEvent(...)，以省略Swing/AWT，但这不是必需的。

关于在事件侦听器回调内部阻塞的注意事项。如果您在该函数内部阻塞，通过睡眠或其他长运行进程，您可能会导致延迟在由 OS 或更糟的关键事件传递中，库被某些操作系统删除。此删除不在库的控制范围内，由 OS.

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