我试图使用JNA在C#和Java之间建立一个回调接口.

C#< - CLI - > Visual C 2010< - JNA - > Java的

在Java和C之间我使用非托管结构来获得回调功能.在C中我试图将具有回调指针的结构包装到托管对象中.

在Java和C之间,一切正常,直到我尝试使用gcroot在非托管代码中生成托管对象.

更新它甚至没有gcroot失败.只需使用“Logger ^ logger = gcnew Logger(logStruct);”

我目前的解决方案如下：

Java的

LoggerStruct.java

package jnatest;

import com.sun.jna.Callback;
import com.sun.jna.Structure;
import java.util.logging.Logger;

public class LoggerStruct extends Structure {
    private Logger logger;

    public interface GetLevelCallback extends Callback {
        int callback();
    }

    public GetLevelCallback getLevel;

    public LoggerStruct(Logger log) {
        super();
        this.log = log;

        getLevel = new GetLevelCallback() {
            public int callback() {
                return logger.getLevel().intValue();
            }
        }

        setFieldOrder(new String[] {"getLevel"});
    }
}

ITestLib.java

package jnatest;

import com.sun.jna.Library;
import com.sun.jna.Native;

public interface ITestLib extends Library {
    ITestLib INSTANCE = (ITestLib) Native.loadLibrary("JNATestC",ITestLib.class);
    int callbackTest(LoggerStruct logStruct);
}

Main.java

package jnatest;

import com.sun.jna.NativeLibrary;
import java.util.logging.Logger;
import java.util.logging.FileHandler;

public class MainClass {
    public static void main(String[] args) throws Exception  {
        NativeLibrary.addSearchPath("JNATestC","C:\\JNATest");

        Logger log = Logger.getLogger("Test");
        FileHandler fileTxt = new FileHandler("Logging.txt");
        log.addHandler(fileTxt);

        LoggerStruct logStruct = new LoggerStruct(log);

        ITestLib.INSTANCE.callbackTest(logStruct);
    }
}

C

JNATestC.h

#pragma once

extern "C" {
    struct LoggerStruct {
        int (*getLevel)();
    }
    __declspec(dllexport) void callbackTest(LoggerStruct * logStruct);
}

namespace JnaWrapperTypes {
    public ref class Logger { // "public ref" because I have to use it in C# as well
        private:
            LoggerStruct * logStruct;
        public:
            Logger(LoggerStruct * logStruct);
            ~Logger() {} 
            int getLevel();
    };
}

JNATestC.cpp

#include "stdafx.h"
#include 

gcroot