java - 我在 LWJGL 中使用键盘时不断收到此错误

Question

我需要你的帮助。 我不断收到此异常:-

Exception in thread "main" java.lang.IllegalStateException: Keyboard must be created before you can read events
    at org.lwjgl.input.Keyboard.next(Keyboard.java:467)
    at oregon.src.Controller.<init>(Controller.java:15)
    at oregon.client.Oregon.start(Oregon.java:19)
    at oregon.client.Oregon.main(Oregon.java:84)

我不知道如何解决它。我早些时候发布了一个问题，有人帮助了我，但后来就导致了这个问题。 这是 (oregon.src.Controller) 的代码:

package oregon.src;

import oregon.client.Oregon;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;

public class Controller {
    public Oregon oregon;

    public Controller(Oregon oregon) throws LWJGLException {
        this.oregon = oregon;

        while (Keyboard.next()) {
            if (Keyboard.getEventKeyState()) {
                if (Keyboard.getEventKey() == Keyboard.KEY_F11) {
                    oregon.setFullscreen();
                }
            }
        }
    }
}

这是 (oregon.client.Oregon) 的代码:

package oregon.client;

import oregon.src.Controller;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;

public class Oregon {
    public static DisplayMode normal = new DisplayMode(640, 640);

    public Controller controller;

    public static boolean fullscreen = false;

    public void start() {
        try {
            controller = new Controller(this);
        } catch (LWJGLException e1) {
            e1.printStackTrace();
        }

        try {
            create();
        } catch (LWJGLException e) {
            stop(e);
        }

        while (!Display.isCloseRequested()) {
            events();
            Display.update();
        }

        Display.destroy();
    }

    public void events() {
        try {
            new Controller(this);
        } catch (LWJGLException e) {
            e.printStackTrace();
        }
    }

    public void setFullscreen() {
        try {
            if (!fullscreen) {
                Display.setFullscreen(true);
                fullscreen = true;
            } else if (fullscreen) {
                Display.setDisplayMode(normal);
                fullscreen = false;
            }
        } catch (LWJGLException e) {
            stop(e);
        }
    }

    public static void create() throws LWJGLException {        
        if (fullscreen) {
            Display.setFullscreen(true);
        } else if (!fullscreen) {
            Display.setDisplayMode(normal);
        }

        Keyboard.create();
        Display.create();
    }

    public void stop() {
        System.exit(0);
        Display.destroy();
    }

    public void stop(Exception e) {
        e.printStackTrace();
        System.exit(0);
        Display.destroy();
    }

    public static void main(String args[]) {
        Oregon oregon = new Oregon();
        oregon.start();
    }
}

如果有人能帮助我，我将不胜感激。 谢谢。

编辑:- 现在我收到此错误。

Exception in thread "main" java.lang.IllegalStateException: Display must be created.
at org.lwjgl.input.Keyboard.create(Keyboard.java:319)
at oregon.src.Controller.<init>(Controller.java:19)
at oregon.client.Oregon.start(Oregon.java:19)
at oregon.client.Oregon.main(Oregon.java:84)

Answer 1

正如错误所述 - 您需要创建键盘

public Controller(Oregon oregon) throws LWJGLException {
        this.oregon = oregon;


        Keyboard.create(); // <- add this here.

        while (Keyboard.next()) {
            if (Keyboard.getEventKeyState()) {
                if (Keyboard.getEventKey() == Keyboard.KEY_F11) {
                    oregon.setFullscreen();
                }
            }
        }
    }

来自API :

"Create" the keyboard. The display must first have been created. The reason for this is so the keyboard has a window to "focus" in.

编辑:似乎您无法同时初始化它们，因此请尝试使用此方法 - 在 if 语句中覆盖初始化 Keyboard :

   if ( !Keyboard.isCreated() && !getPrivilegedBoolean("org.lwjgl.opengl.Display.nokeyboard") ) {
                try {
                    Keyboard.create();
                } catch (LWJGLException e) {
                    if ( LWJGLUtil.DEBUG ) {
                        e.printStackTrace(System.err);
                    } else {
                        LWJGLUtil.log("Failed to create Keyboard: " + e);
                    }
                }
            }

Here is posted similar source code, that seems to be working fine.