单声道互操作:加载 32 位共享库在我的 64 位系统上不起作用 [英] Mono interop: Loading 32bit shared library does not work on my 64bit system

问题描述

在我的系统上运行一个简单的互操作示例时遇到问题.我构建了一个简单的 32 位共享库，名为 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 10.04 x86_64

My System: Ubuntu Linux 10.04 x86_64

Mono C# 编译器版本 2.4.4.0

Mono C# compiler version 2.4.4.0

此外，我还有一个使用我的共享库的示例 c# 程序:

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;
        }   
}

问题:加载库不起作用.

The Problem: Loading the library does not work.

导出 MONO_LOG_LEVEL=debug 给我以下提示:Mono-INFO: DllImport error loading library './libtest.so: Wrong ELF-Class: ELFCLASS32'.

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

好吧，我猜 mono 在 64 位模式下运行我的程序，因此它不能调用 32 位共享库?如果我以 64 位模式(没有 -m32)构建共享库，一切正常！！

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 Mono-Compiler 2.4.4.没有使用/platform:x86 指定平台的选项，因此我安装了 2.10 版，但使用它也不起作用.

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

是否有可能在 64 位系统上加载 32 位共享库?

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

推荐答案

问题是您的系统上安装了 64 位版本的 Mono，它只能 P/Invoke 到 64 位本机库，它不能 P/Invoke 到 32 位本机库中.

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.

-platform:x86 标志用于 C#编译器，而不是运行时，并且不提示运行时使用 32 位内存空间.

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.

如果你想 P/Invoke 到 32 位原生库，你需要在你的 Ubuntu 系统上安装 32 位版本的 Mono.

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

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