我已经运行在我的系统一个简单的例子互操作的问题。 我建立了一个叫libtest.so（C ++）

i have a problem running a simple interop example on my system. I built a simple 32-bit shared library called libtest.so (c++)

g++ -c -fpic test.cpp -m32
g++ -shared -fpic -o libtest.so test.o -m32

我的系统： Ubuntu Linux操作系统的10.04 x86_64的

My System: Ubuntu Linux 10.04 x86_64

单C＃编译器版本2.4.4.0

Mono C# compiler version 2.4.4.0

另外，我有一个示例C＃程序中使用我的共享库：

In addition i have a sample c# program using my shared library:

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

public class Test
{
        [DllImport("libdl.so")] 
        static extern IntPtr dlopen(string filename, int flags); 

        [DllImport("libdl.so")] 
        static extern IntPtr dlclose(IntPtr handle);

        [DllImport ("./libtest.so")]
        private static extern void HelloWorld();

        [DllImport ("./libtest.so",EntryPoint="Test")]
        private static extern int Testl(int a,int b); 

        public static int Main(string[] args)
        {   
                IntPtr handle = dlopen("./libtest.so",2);
                if(handle == IntPtr.Zero)
                {   
                       Console.WriteLine("Error loading shared library");
                        return -1; 
                }   

                HelloWorld();
                int ret = Testl(116,1);
                Console.WriteLine("Result from shared-Librarry Call: " + ret);

                dlclose(handle);
                return 0;
        }   
}

的问题：加载库无法正常工作

The Problem: Loading the library does not work.

导出MONO_LOG_LEVEL =调试给了我以下提示： 单-INFO：的DllImport加载库'./libtest.so：错误的ELF级：ELFCLASS32。

exporting MONO_LOG_LEVEL=debug gives me the following hint: Mono-INFO: DllImport error loading library './libtest.so: Wrong ELF-Class: ELFCLASS32'.

嗯，我想单运行我的程序在64位模式，因此不能调用32位的共享库？如果我在64位模式构建的共享库（不-m32）一切工作正常！

Well i guess mono runs my program in 64-bit mode and therefore it cannot call a 32-bit shared library? If i build the shared library in 64 bit mode (without -m32) everything works fine!!

我的单编译器2.4.4。不必指定与/平台的平台选项：86，所以我安装了2.10版，但使用它也不行

My Mono-Compiler 2.4.4. does not have the option to specify the platform with /platform:x86 and therefore i installed version 2.10, but using it does not work either.

/opt/mono-2.10/bin/gmcs /platform:x86 sharpCall.cs

是否有可能加载在64位系统的32位共享库？

Is there a possibility to load 32-bit shared libraries on a 64-bit system?

推荐答案

现在的问题是，你有单声道的64位版本的系统上安装的可的只有的P /调用到64位机库，它的不能的P /调用到32位机库。

The problem is that you have a 64bit version of Mono installed on your system which can only P/Invoke into 64bit native libraries, it cannot P/Invoke into 32bit native libraries.

的-platform：86标志是指对于C＃的编译的，未运行时，不暗示到运行时使用32位的存储器空间

The -platform:x86 flag is meant for the C# compiler, not the runtime, and does not hint to the runtime to use a 32bit memory space.

您需要，如果你想你的Ubuntu系统上安装Mono的32位版本的P / Invoke到32位机库。

You need to install the 32bit version of Mono on your Ubuntu system if you want to P/Invoke into 32bit native libraries.