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microsoft.public.dotnet.framework.interop

C# and C++ in same assembly

nickdu

9/19/2007 9:46:00 PM

I've been reading through the MSDN docs and just can't seem to find an answer
to my question. What I'm trying to find out is whether it's possible to
introduce C# into our C++ application. I don't want to do this via a DLL but
instead would like the C# code to be statically linked in the executable. Is
this possible?

What I'm having a hard time figuring out is how the C++ code would know
about the C# classes. In the unmanaged world you simply include a header
file for the external types. If what I want to do is possible how would the
C++ code be able to new the C# class? How would it know about it? Is there
some pragma statement?

In the research I've done it seems as if I should be able to compile a CS
file to a .netmodule and then link it with my C++ code. Is this not the case?
--
Thanks,
Nick

nicknospamdu@community.nospam
remove "nospam" change community. to msn.com
6 Answers

G Himangi

9/20/2007 5:53:00 AM

0

Yes, its possible if your C++ supports Managed Extensions, you specify the
..netmodule on the Linker options page - "Additonal Input Modules"

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"nickdu" <nicknospamdu@community.nospam> wrote in message
news:AAF817A3-099F-40F0-83F6-5B2377BB8FB4@microsoft.com...
> I've been reading through the MSDN docs and just can't seem to find an
> answer
> to my question. What I'm trying to find out is whether it's possible to
> introduce C# into our C++ application. I don't want to do this via a DLL
> but
> instead would like the C# code to be statically linked in the executable.
> Is
> this possible?
>
> What I'm having a hard time figuring out is how the C++ code would know
> about the C# classes. In the unmanaged world you simply include a header
> file for the external types. If what I want to do is possible how would
> the
> C++ code be able to new the C# class? How would it know about it? Is
> there
> some pragma statement?
>
> In the research I've done it seems as if I should be able to compile a CS
> file to a .netmodule and then link it with my C++ code. Is this not the
> case?
> --
> Thanks,
> Nick
>
> nicknospamdu@community.nospam
> remove "nospam" change community. to msn.com


wawang

9/20/2007 10:23:00 AM

0

Thanks G Himangi for your informative input.

Hi Nick,

Here's a quick sample on how to achieve this (based on this blog
http://blogs.msdn.com/texblog/archive/2007/04/05/linking-native-c-...
lications.aspx, it's linking native c++ into C#, what we needed is the
opposite but steps are similar):


1) Create a C++ file clrcode.cpp:


using namespace System;
using namespace ClassLibrary1;

void main()
{
Class1^ c1 = gcnew Class1();
c1->Test();
}



2) Create a C# class class1.cs:

using System;
using System.Collections.Generic;
using System.Text;


namespace ClassLibrary1
{
public class Class1
{
public void Test()
{
Console.WriteLine("Test");
}
}
}


3) Start VS2005 environment command prompt:

csc /target:module Class1.cs
cl /clr /LN /MD clrcode.cpp /FU Class1.netmodule

link /LTCG /CLRIMAGETYPE:IJW /SUBSYSTEM:CONSOLE
/ASSEMBLYMODULE:clrcode.netmodule /OUT:MixedApp.exe clrcode.obj
Class1.netmodule

MixedApp


Hope this helps.


Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

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nickdu

9/20/2007 10:36:00 AM

0

Great, thanks.

Unfortunately the MSDN docs don't discuss this or I'm just bad at finding
it. As I mentioned I read up on the .netmodule and some of that
documentation led me to believe it was possible. The part I was missing was
the /FU on the c++ compile. Since I didn't know about this I was not
understanding how the C++ code would be made aware of the C# classes. This
explains it (I hope). I'll give it a try.

Your example is great as I usually work from the command line and use
makefiles. I'm not a big fan of Visual Studio. Unfortunately most others in
the group are using VS so I'm going to need to figure out what GUI element
corresponds to the /FU flag.
--
Thanks,
Nick

nicknospamdu@community.nospam
remove "nospam" change community. to msn.com


""Walter Wang [MSFT]"" wrote:

> Thanks G Himangi for your informative input.
>
> Hi Nick,
>
> Here's a quick sample on how to achieve this (based on this blog
> http://blogs.msdn.com/texblog/archive/2007/04/05/linking-native-c-...
> lications.aspx, it's linking native c++ into C#, what we needed is the
> opposite but steps are similar):
>
>
> 1) Create a C++ file clrcode.cpp:
>
>
> using namespace System;
> using namespace ClassLibrary1;
>
> void main()
> {
> Class1^ c1 = gcnew Class1();
> c1->Test();
> }
>
>
>
> 2) Create a C# class class1.cs:
>
> using System;
> using System.Collections.Generic;
> using System.Text;
>
>
> namespace ClassLibrary1
> {
> public class Class1
> {
> public void Test()
> {
> Console.WriteLine("Test");
> }
> }
> }
>
>
> 3) Start VS2005 environment command prompt:
>
> csc /target:module Class1.cs
> cl /clr /LN /MD clrcode.cpp /FU Class1.netmodule
>
> link /LTCG /CLRIMAGETYPE:IJW /SUBSYSTEM:CONSOLE
> /ASSEMBLYMODULE:clrcode.netmodule /OUT:MixedApp.exe clrcode.obj
> Class1.netmodule
>
> MixedApp
>
>
> Hope this helps.
>
>
> Regards,
> Walter Wang (wawang@online.microsoft.com, remove 'online.')
> Microsoft Online Community Support
>
> ==================================================
> When responding to posts, please "Reply to Group" via your newsreader so
> that others may learn and benefit from your issue.
> ==================================================
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>

nickdu

9/20/2007 10:42:00 AM

0

Great, thanks.

Unfortunately the MSDN docs don't discuss this or I'm just bad at finding
it. As I mentioned I read up on the .netmodule and some of that
documentation led me to believe it was possible. The part I was missing was
the /FU on the c++ compile. Since I didn't know about this I was not
understanding how the C++ code would be made aware of the C# classes. This
explains it (I hope). I'll give it a try.

Your example is great as I usually work from the command line and use
makefiles. I'm not a big fan of Visual Studio. Unfortunately most others in
the group are using VS so I'm going to need to figure out what GUI element
corresponds to the /FU flag.
--
Thanks,
Nick

nicknospamdu@community.nospam
remove "nospam" change community. to msn.com


""Walter Wang [MSFT]"" wrote:

> Thanks G Himangi for your informative input.
>
> Hi Nick,
>
> Here's a quick sample on how to achieve this (based on this blog
> http://blogs.msdn.com/texblog/archive/2007/04/05/linking-native-c-...
> lications.aspx, it's linking native c++ into C#, what we needed is the
> opposite but steps are similar):
>
>
> 1) Create a C++ file clrcode.cpp:
>
>
> using namespace System;
> using namespace ClassLibrary1;
>
> void main()
> {
> Class1^ c1 = gcnew Class1();
> c1->Test();
> }
>
>
>
> 2) Create a C# class class1.cs:
>
> using System;
> using System.Collections.Generic;
> using System.Text;
>
>
> namespace ClassLibrary1
> {
> public class Class1
> {
> public void Test()
> {
> Console.WriteLine("Test");
> }
> }
> }
>
>
> 3) Start VS2005 environment command prompt:
>
> csc /target:module Class1.cs
> cl /clr /LN /MD clrcode.cpp /FU Class1.netmodule
>
> link /LTCG /CLRIMAGETYPE:IJW /SUBSYSTEM:CONSOLE
> /ASSEMBLYMODULE:clrcode.netmodule /OUT:MixedApp.exe clrcode.obj
> Class1.netmodule
>
> MixedApp
>
>
> Hope this helps.
>
>
> Regards,
> Walter Wang (wawang@online.microsoft.com, remove 'online.')
> Microsoft Online Community Support
>
> ==================================================
> When responding to posts, please "Reply to Group" via your newsreader so
> that others may learn and benefit from your issue.
> ==================================================
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>

wawang

9/21/2007 4:02:00 AM

0

Hi Nick,

For the "/FU" switch, please see document here:

http://msdn2.microsoft.com/en-us/librar...(VS.80).aspx
<quote>
/FU Forces the use of a file name as if it had been passed to the #using
directive.
</quote>


This is equivalent to following code:

#using "ClassLibrary1.dll"

using namespace ClassLibrary1;

int _tmain(int argc, _TCHAR* argv[])
{
Class1^ c1 = gcnew Class1();
c1->Test();
return 0;
}


I would suggest you to leave the .netmodule generating and linking to your
makefile, in Visual Studio, use the #using and call the external c#
assembly. This is because currently there's no GUI option to generate a
module from your C# class, unless you use post-build event to call external
build scripts or customize the project file (msbuild):

#Sebastien St-Laurent's (AKA Sebby) WebLog : Practical .NET2 and C#2: An
introduction to MSBuild
http://blogs.msdn.com/sebby1234/archive/2006/04/01/5...


Please feel free to let me know if there's anything unclear. Thanks.


Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

wawang

9/26/2007 3:32:00 AM

0

Hi Nick,

I'm writing to check the status of this post. Please feel free to let me
know if there's anything else I can help. Thanks.


Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.