How to access MFC regular dll Exported functions in C#?

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Problem Definition:

We are having MFC regular dll trough which we exported 5 functions.
Question is how to access regular MFC dll exported functions from C# application?

Input:

1. Originally MFC dll was developed and built under Visual Studio 6.0
2. It's having def file containing list of 5 exported functions. (Not under any class)
3. I was able to built this dll successfully on VS 2005 studio with /Clr option enabled.
4. If i tried to add reference of .tlb file in C# application, it's giving me error: Not valid assembly or com component.

Question is,

What I am doing wrong here? Adding converted dll (with /clr enabled) also as reference in C# application does not show me list of exported functions.

What is the proper way of accessing regular MFC dll (Use MFC in shared Dll) from C# application?

Newly Added Information:

I am having 5 exported functions in my dll, not member of any class and exported as follows:

__declspec(dllexport)long WINAPI Functio1(float *pf, float *pf1,
float *pf2, float *pf3, long Size)

Posted 23-Mar-10 1:22am

prashnat.vanarase

Updated 23-Mar-10 2:47am

v2

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#realJSOP · Answer 1 · 2010-03-23T01:47:00

Solution 1

I think what you need to do is use the System.Runtime.InteropServices namespace.

Posted 23-Mar-10 1:47am

#realJSOP

Updated 23-Mar-10 1:48am

v3

Nicholas Butler · Answer 2 · 2010-03-23T02:35:00

You can use a normal native dll from C# using P/Invoke. Export your C++ functions using extern "C" to prevent C++ name mangling, then import them in your C# project like this:

C#

[DllImport( "user32.dll" )]
public static extern IntPtr SendMessage(
    IntPtr hWnd,
    UInt32 msg,
    IntPtr wParam,
    IntPtr lParam );

There's plenty of info on P/Invoke on the net. This site will give you plenty of examples:

http://www.pinvoke.net/[^]

Nick

prashnat.vanarase · Answer 3 · 2010-03-23T02:40:00

Solution 3

Thanks to both of you for your answers, can you please tell me How I can achieve the same using C++/CLI wrapper?

For some good reasons I don't want to go with P/Invoke. Thanks in advance.

Posted 23-Mar-10 2:40am

prashnat.vanarase

Updated 23-Mar-10 2:48am

v2

a ahole · Answer 4 · 2011-06-26T08:01:00

Solution 4

Just point the guy to some source code that he can download.
I hate aholes who just paste and copy answers like those above

Posted 26-Jun-11 8:01am

a ahole