Export / Import C++ Managed Classes

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amirbehzadan@hotmail.com - 26 May 2006 20:07 GMT

Hello,

I am writing some C++ classes and want to export them as .dll files so
other users can import them and use the methods I have provided in
those classes. I have two types of classes : unmanaged (or regular
classes) and managed (__gc classes). I already know how to use
"__declspec(dllexport)" to export and "__declspec(dllimport)" to import
"unmanaged" classes. However I dont know how to export "managed"
classes since this method doesnt work for them.

Can anyone help me with this ?

Regards,
Amir

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Jochen Kalmbach [MVP] - 26 May 2006 20:33 GMT

Hi amirbehzadan!

> I am writing some C++ classes and want to export them as .dll files so
> other users can import them and use the methods I have provided in
[quoted text clipped - 3 lines]
> "unmanaged" classes. However I dont know how to export "managed"
> classes since this method doesnt work for them.

Just declare it as "public" and put it into a namespace. That´s it.

Any other managed programming language can simply reference the DLL and
use your class.

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Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

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amirbehzadan@hotmail.com - 26 May 2006 20:43 GMT

Hi Jochen,

Thanks a lot. That solved the problem of creating the DLL file. Now
when I am using the corresponding header and library file in a test
application to use that DLL file, I get a number of "unresolved tokens"
that most of them point to the functions inside the imported managed
class. Examples are :

Test error LNK2020: unresolved token (0600000B) TCM::.ctor
Test error LNK2020: unresolved token (0600000C) TCM::Finalize
Test error LNK2020: unresolved token (0600000E) TCM::Start
Test error LNK2020: unresolved token (0600000F) TCM::Stop
Test error LNK2020: unresolved token (06000010) TCM::BytesInRQ
Test error LNK2020: unresolved token (06000011) TCM::stdString
Test fatal error LNK1120: 6 unresolved externals

the last four functions are functions inside the imported managed class
TCM.

Thanks,
Amir

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Jochen Kalmbach [MVP] - 27 May 2006 07:59 GMT

Hi amirbehzadan!

> Thanks a lot. That solved the problem of creating the DLL file. Now
> when I am using the corresponding header and library file in a test
> application to use that DLL file, I get a number of "unresolved tokens"

You *must not* use header and lib-files!!!

Just add (VC2003):
#using <MyManagedDll.dll>

Or in VS2005, add the reference to your project properties
(Common|References).

Signature

Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

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Export / Import C++ Managed Classes

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