从非托管 C++ 代码调用 C# 函数时无法处理异常

Question

问题的思路如下：我将 C# 函数指针传递给 C++ 编译库，然后从 C++ 调用传递的函数。我想从代码中捕获 C#/C++ 异常，代码位于 before C++ 函数调用。

问题的思路如下：我将 C# 函数指针传递给 C++ 编译库，然后从 C++ 调用传递的函数。我的 C++ 调用包含在 try/catch 中，我想从 C++/C# 函数中捕获异常。

所以，我有 .NET 5 应用程序，它运行以下代码：

class NetProgram
{
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    public delegate void CustomCppFunc(int id);

    [DllImport("/root/projects/LinuxLoop/bin/x64/Debug/libLinuxLoop.so")]
    protected static extern void strg_Create(IntPtr cb_is_my);

    static void Main(string[] args)
    {
        CustomCppFunc sharpDelegate = new CustomCppFunc(Smth.sharpStaticMethod);

        try
        {
            strg_Create(Marshal.GetFunctionPointerForDelegate(sharpDelegate));
        }
        catch (Exception e)
        {
            Console.WriteLine("Catched exception from C# Program: " + e.Message);
        }
        finally
        {
            Console.WriteLine("Finally from C# Program.");
        }
    }

    public class Smth
    {
        public static void sharpStaticMethod(IntPtr id)
        {
            Console.WriteLine("C#. sharpStaticMethod. Invoked.");

            Console.WriteLine("C#. sharpStaticMethod. Zero division.");
            var b = 0;
            var a = 1 / b;
        }
    }

}

libLinuxLoop.so 是 Linux 的 C++ 编译库（我使用的是 CentOS 7），它有以下内容：

MyCppFunc.h:

#ifdef MYCPPFUNC
#define MYCPPFUNC __attribute__((dllexport))
#else
#define MYCPPFUNC __attribute__((dllimport))
#endif

typedef void(*CBIsMy)(int order_id);

extern "C" MYCPPFUNC void *strg_Create(CBIsMy cb_is_my);

MyCppFunc.cpp:

#include <cstdio>
#include <utility>
#include <limits.h>
#include "MyCppFunc.h"

void *strg_Create(CBIsMy cb_is_my) {
    std::fputs("C++. strg_Create. Invoked.\n", stdout);

    std::fputs("C++. strg_Create. Invoking C# delegate.\n", stdout);
    cb_is_my(1);

    return NULL;
}

运行应用程序写入以下消息：

C++. strg_Create. Invoked.
C++. strg_Create. Invoking C# delegate.
C#. sharpStaticMethod. Invoked.
C#. sharpStaticMethod. Zero division.
Unhandled exception. System.DivideByZeroException: Attempted to divide by zero.
at TestPlayground0806.NetProgram.Smth.sharpStaticMethod(Int32 id) in C:\Users\dev02\source\repos\TestPlayground0806\TestPlayground0806\NetProgram.cs:line 106
Aborted (core dumped)

结果：从非托管代码调用的 C# 函数中抛出异常，导致整个应用程序崩溃。我应该怎么做才能捕捉到这些异常？

更新： 异常在 Windows 10 上被捕获，但我无法在 CentOS 7 上捕获它。

Answer 1

It works that way on Windows because the Windows stack frames support the exception mechanism through non-managed frames. It does not work that way on Linux because the Linux stack frames do not support the exception mechanism through non-managed frames. – Eljay

从非托管 C++ 代码调用 C# 函数时无法处理异常

Can't handle exceptions when invoking C# function from unmanaged C++ code

.net

c#

c++

linux

dllexport