如何在Java和C#之间为JNA包装它时,在非托管C++中创建托管对象？

Question

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

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 <vcclr.h>
#include "JNATestC.h"

namespace JnaWrapperTypes {
    Logger::Logger(LoggerStruct * logStruct) {
        this->logStruct = logStruct;
    }
    Logger::getLevel() {
        return logStruct->getLevel();
    }
}

using namespace JnaWrapperTypes;
using namespace StaticCSharpNamespace; // Just an example. Not existing C# lib.

extern "C" {
    __declspec(dllexport) void callbackTest(LoggerStruct * logStruct) {
        int level = logStruct->getLevel();

        gcroot<Logger^> logger = gcnew Logger(logStruct); // IF I ADD "gcroot" FOR "Logger" THEN WHOLE INVOKE FAILS
        level = logger->getLevel();

        StaticCSharpClass::staticMethod(logger); // I want to pass Managed object to C# later

        gcroot<System::String^> str = gcnew System::String(""); // This doesn't generate error
    }
}

我在飞行中写了这些.我希望这些也可以验证.

我究竟做错了什么？例如,如果我使用...

gcroot<System::String^> str = gcnew System::String("");

......一切正常

是否有另一种方法将托管对象传递给C#？

记录此错误日志

UPDATE

似乎任何我自己的Class用法都会让我失败.

UPDATE

我自己管理的对象或函数的Anykind使我失败.

UPDATE

StaticCSharpClass :: STATICMETHOD(); 也失败了.看起来所有与托管对象相关的操作都会失败.

UPDATE

如果我从.NET调用相同的方法,一切正常.

只是为了让这个问题更容易找到 内部错误(0xe0434352)

Answer 1

应该用谷歌搜索错误“内部错误（0xe0434352）”。

http://jira.talendforge.org/browse/TDI-19427

这表明我必须为 GAC（全局程序集缓存）注册 dll，因为 Java 仅在 GAC 和应用程序基目录中搜索 dll。因为 Java.exe 路径不可配置。

==解决方案==

使用构建后事件为 GAC 注册程序集：

gacutil /i "$(TargetPath)"

很棒的独白！=)