Java + JNA:找不到指定的过程 [英] Java + JNA : The specified procedure could not be found

问题描述

我正在尝试使用Visual Studio创建一个dll文件，并在Java项目中使用/访问它.该库似乎已加载，但始终会引发相同的异常: 线程主"中的异常java.lang.UnsatisfiedLinkError:查找函数'function'时出错:找不到指定的过程. 我的C/C ++技能不是最好的，所以问题可能就在那里.我试图使用类，名称空间，静态方法和其他在Web上找到的人员来编辑h和cpp文件，但无所事事. 我也看到过其他有关Depency Walker Tool的文章，但是它无法打开我的dll，我还看到编译器在函数名称中添加了一些奇怪的后缀，因为我知道可以通过使用"estern"来避免它h或cpp文件中的"C""，但我无法.

I'm trying to create a dll file using visual studio and use/access it in a java project. The library seems to get loaded, but always the same exception is thrown: Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'function': The specified procedure could not be found. My C/C++ skills ar not the best so the problem could be there. I tried to edit h and cpp files, using classes, namespaces, static methods and other staff found on the web, but nothing to do. I have also seen other post talking about Depency Walker Tool, but it isn't able to open my dll, i also saw that the compiler add some strange suffixes to the function name, as i understood it's possible to avoid it by using "estern 'C'" in the h or cpp file, but i wasn't able.

我的界面:

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

public interface SimpleDll extends Library {

    SimpleDll instance = (SimpleDll) Native.loadLibrary("SimpleDll", SimpleDll.class);

    void function();


}

我的主班:

public class Test_Dll {

    public static void main(String[] args) {
        SimpleDll simpleDll = SimpleDll.instance;

        simpleDll.function();
    }
}

我的h文件:

#ifndef SIMPLEDLL
#define SIMPLEDLL

namespace simpeDll{


    static void function();


}
#endif

我的cpp文件:

#include "stdafx.h"
#include "simpleDll.h"
#include <stdexcept>

using namespace simpeDll;

static void function(){

}

推荐答案

1. 确保在simpleDll命名空间之外声明函数.
2. 确保使用extern "C"
装饰它
3. 确保公开您的函数__declspec(dllexport) void __cdecl function();或使用模块定义文件

1. Make sure declaring your function outside the simpleDll namespace.
2. Make sure to decorate it w/ extern "C"
3. Make sure exposing your function __declspec(dllexport) void __cdecl function(); or use module definition file

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