Java 如何从JNI方法正确调用NSOpenPanel以在正确的线程上运行

由于我不熟悉JNI-C和JNF，我只能让JNI类部分执行.到目前为止，我try 的方法如下:

这里是Open.java，它是一个更重要的Java Swing应用程序的MCV，它配得上一个更好看、功能更强大的打开文件对话框，而不是不合理的java.awt.FileDialog或丑陋而功能不佳的javax.swing.JFileChooser.

import java.awt.event.*;
import javax.swing.*;
public class Open extends JFrame {
   public Open () {
      getContentPane().add(new JButton(new AbstractAction() {
         public void actionPerformed (ActionEvent e) {
            try {
               NativeOpenFileDialog.run();
            } catch (Throwable ex) {
               System.err.println(ex.getMessage());
            }
         }
      }));
      pack();
      setVisible(true);
   }
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() { new Open(); }
      });
   }
}

以下是NativeOpenFileDialog.Java

import javax.swing.*;

public class NativeOpenFileDialog {
   static {
       System.loadLibrary("natopndlg");
   };
   public static native void run ();
   public static void main (String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() { NativeOpenFileDialog.run(); }
      });

   }
}

以下是NativeOpenFileDialog.m

#import <Cocoa/Cocoa.h>

#include <jni.h>
#include "NativeOpenFileDialog.h"

JNIEXPORT void JNICALL Java_NativeOpenFileDialog_run (JNIEnv *thisEnv, jclass jcls) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSOpenPanel *panel = [NSOpenPanel openPanel];
    [panel setCanChooseFiles:YES];
    [panel setCanChooseDirectories:YES];
    [panel setAllowsMultipleSelection:YES];
    if ([panel runModal] != NSModalResponseOK)
        NSLog(@"User did not press OK");
    [pool release];
}

下面是Makefile(我使用的是Xcode15.2):

SDK = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk

Open.class: Open.java NativeOpenFileDialog.java NativeOpenFileDialog.m
    javac -h . NativeOpenFileDialog.java
    javac Open.java
    gcc -dynamiclib -o libnatopndlg.dylib -framework Cocoa -isysroot $(SDK) -I $(JAVA_HOME)/include -I $(JAVA_HOME)/include/darwin -fobjc-exceptions -std=c99 NativeOpenFileDialog.m

这是我在执行make次后的执行方式.

java Open

单击该按钮会引发例外情况:

NSInternalInconsistencyException', reason: 'NSWindow should only be instantiated on the main thread!

知道面板应该在UI线程上打开，这是可以理解的.我相信我要做的就是确保NSOpenPanel创建的窗口是JFrame的子窗口，并在UI线程上打开.我认为这至少意味着我必须执行Java函数才能获得JFrame的NSWindow.