我们如何在 C# 中从 C++ DLL 中获取所有方法？

Question

I have a C++ DLL and I need to get it's methods in my C# app, but I am not able to get the methods.

This is my code: I try to convert C++ Dll to byte array and get it's methods.

byte[] data = File.ReadAllBytes(@"C:\test.dll");
var result = data.GetType();

foreach (Type type in result.Assembly.GetTypes())
{
    if (!type.IsPublic)
    {
        continue;
    }

    MemberInfo[] members = type.GetMethods();

    foreach (MemberInfo member in members)
    {
        Console.WriteLine(member.Name);
    }
}

Answer 1

I don't think it is possible. I think a normal dll doesn't even contain Type Metadata.

But maybe I'm wrong. Or maybe this helps: Import TLB into C#

Answer 2

A C++ DLL is not a .NET Assembly, so the kind of Reflection you are looking for simply will not work.

Unless the DLL has an embedded COM type library in it, the only thing you can obtain with 100% certainty is the names/ordinals of the DLL's exported functions, since that info is freely available in the DLL's EXPORTS table. But to get any more detailed info about the functions (return values, calling conventions, parameter lists), you would have to reverse engineer the DLL's raw machine code, which is not trivial to do. That info is simply not stored anywhere in the DLL itself, only the compiler that created the DLL knew those details. Reverse engineering tools like IDA can make the task a bit easier, but there is still a lot of manual work involved to interpret and tweak the results.