Access to C# functions or classes from unmanaged C++

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Clement - 05 Oct 2004 19:43 GMT

I have made a dll in unmanaged C++ code using Visual Studio.Net 2003. I
would like to access C# functions or class methods from this dll. The C#
code would be in an other dll.

Typically, the C++ code does shell interaction, while the C# part is a
GUI and a web services client. The functions or methods will be called
to have a form displayed, or to get an integer value.

I have tried to use References, without success. I suppose this is to be
used with manages C++ code only, and anyway I couldn't have it working.

An other solution is probably to create a COM class in C# and access it
from C++, but once more I couldn't have anything working.

Do you have any ideas or suggestions ? Any code sample would be welcome.

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Clement Gatin

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Luis Abreu - 05 Oct 2004 22:41 GMT

Hello. have you thought about pinvoke? or is this not possible? take a
look at this:

http://www.codeguru.com/Cpp/COM-Tech/complus/managed/article.php/c3947/

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Luis Abreu
http://weblogs.pontonetpt.com/luisabreu
http://www.pontonetpt.com

> I have made a dll in unmanaged C++ code using Visual Studio.Net 2003. I
> would like to access C# functions or class methods from this dll. The C#
[quoted text clipped - 11 lines]
>
> Do you have any ideas or suggestions ? Any code sample would be welcome.

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Clement - 07 Oct 2004 21:11 GMT

> Hello. have you thought about pinvoke? or is this not possible? take a
> look at this:
>
> http://www.codeguru.com/Cpp/COM-Tech/complus/managed/article.php/c3947/

Well, my goal is to access C# functions from C++ code, while pInvoke
seems to be made to access c++ code (in dll) from .NET (c#) applications.

But I could achieve my goal using COM finally. I had previously not
tried to use the tlb files (using #import directive), which seem to be
the easiest way to use COM classes from C++.

Thanks for the help anyway.

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Clément Gatin

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Luis Abreu - 09 Oct 2004 00:32 GMT

Hello Clement.

Sorry...I didn't understand what you really wnated on the 1st post. However,
in your case, there's another solution which is documented on this article:

http://www.codeproject.com/dotnet/bridge.asp

I think that this approach is more eficient that wrapping the objects in
COM. hope it helps.

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---
Regards,
Luis Abreu
http://weblogs.pontonetpt.com/luisabreu
http://www.pontonetpt.com

> > Hello. have you thought about pinvoke? or is this not possible? take a
> > look at this:
[quoted text clipped - 9 lines]
>
> Thanks for the help anyway.

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Luis Abreu - 09 Oct 2004 11:57 GMT

oh, another thing? if want to call them from unmanaged code, why don't you
build a mixed (i think that this is the right name) c++ component (one that
has support for .net)?

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---
Regards,
Luis Abreu
http://weblogs.pontonetpt.com/luisabreu
http://www.pontonetpt.com

> Hello Clement.
>
[quoted text clipped - 8 lines]
> > > Hello. have you thought about pinvoke? or is this not possible? take a
> > > look at this:

http://www.codeguru.com/Cpp/COM-Tech/complus/managed/article.php/c3947/

> > Well, my goal is to access C# functions from C++ code, while pInvoke
> > seems to be made to access c++ code (in dll) from .NET (c#) applications.
[quoted text clipped - 4 lines]
> >
> > Thanks for the help anyway.

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Access to C# functions or classes from unmanaged C++

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