“尚未创建缓冲区” ...同时创建缓冲区

发布于 2024-09-13 13:41:14 字数 1323 浏览 9 评论 0原文

我有（我认为是）一个简单的 JFrame BufferStrategy。它是这样创建的：

    // Buffer
    container.createBufferStrategy(2);           
    strategy = container.getBufferStrategy();

但是，偶尔我会收到以下错误（它指向前面代码片段的第一行作为违规项）：

java.lang.IllegalStateException：尚未创建缓冲区

错误的出现和消失是很奇怪的——有时会被触发，有时不会。我怀疑这意味着这是一个线程问题。有人对这里可能发生的情况有任何指示吗？我有点不知所措，因为我已经在尝试做 Java 所说的事情了！

编辑：完整跟踪：

Exception in thread "main" java.lang.IllegalStateException: Buffers have not been created
        at sun.awt.windows.WComponentPeer.getBackBuffer(WComponentPeer.java:877)
        at java.awt.Component$FlipBufferStrategy.getBackBuffer(Component.java:3815)
        at java.awt.Component$FlipBufferStrategy.updateInternalBuffers(Component.java:3800)
        at java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3791)
        at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3730)
        at java.awt.Component$FlipSubRegionBufferStrategy.<init>(Component.java:4253)
        at java.awt.Component.createBufferStrategy(Component.java:3612)
        at java.awt.Window.createBufferStrategy(Window.java:3015)
        at java.awt.Component.createBufferStrategy(Component.java:3536)
        at java.awt.Window.createBufferStrategy(Window.java:2990)

原文

I have (what I thought was) a straightforward BufferStrategy for a JFrame. It is created like so:

    // Buffer
    container.createBufferStrategy(2);           
    strategy = container.getBufferStrategy();

However, occassionally I receive the following error (which points to the first line of the preceeding snippet as the offending item) :

java.lang.IllegalStateException: Buffers have not been created

This error is peculiar as it comes and goes - sometimes it is triggered, sometimes not. I suspect this means it's a threading issue. Does anyone have any pointers as to what might be going on here? I'm a little at a loss, since I'm already trying to do what Java says it wants me to do!

edit: full trace:

Exception in thread "main" java.lang.IllegalStateException: Buffers have not been created
        at sun.awt.windows.WComponentPeer.getBackBuffer(WComponentPeer.java:877)
        at java.awt.Component$FlipBufferStrategy.getBackBuffer(Component.java:3815)
        at java.awt.Component$FlipBufferStrategy.updateInternalBuffers(Component.java:3800)
        at java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3791)
        at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3730)
        at java.awt.Component$FlipSubRegionBufferStrategy.<init>(Component.java:4253)
        at java.awt.Component.createBufferStrategy(Component.java:3612)
        at java.awt.Window.createBufferStrategy(Window.java:3015)
        at java.awt.Component.createBufferStrategy(Component.java:3536)
        at java.awt.Window.createBufferStrategy(Window.java:2990)

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暖风昔人 2024-09-20 13:41:14

当您调用createBufferStrategy 时，框架需要可显示。另外，正如 camickr 所指出的，您需要从 EDT 中调用它。

确保这一点的一种方法是扩展 JFrame 并覆盖 addNotify：

class MyFrame extends JFrame {
    public void addNotify() {
        super.addNotify();
        // Buffer
        createBufferStrategy(2);           
        strategy = getBufferStrategy();
    }
}

The frame needs to be displayable when you call createBufferStrategy. Also as camickr has pointed out you need to call it from the EDT.

One way to ensure this is to extend JFrame and override addNotify:

class MyFrame extends JFrame {
    public void addNotify() {
        super.addNotify();
        // Buffer
        createBufferStrategy(2);           
        strategy = getBufferStrategy();
    }
}

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