Re: migrating VC6 to VC8
- From: "Carl Daniel [VC++ MVP]" <cpdaniel_remove_this_and_nospam@xxxxxxxxxxxxxxx>
- Date: Thu, 27 Oct 2005 07:06:58 -0700
Tony Johansson wrote:
> Hello!!
>
> You may correct me if I say something that is not right.
>
> If I want to use the .NET framework for an VC6/MFC application I must
> compile the VC6/MFC to VC8 using the /CLI switch after removing all
> the errors?
If you wan to use .NET 2.0, yes. You can do it with VC 7.1 (2003) for .NET
1.1, but you won't have the new managed C++ syntax.
> The old MFC will work in the new VS2005(VC8)
> My MFC project consist of several files that constitute the MFC
> application.
You may have to make a change here and there, by overall, yes.
> Now assume that I want to change something in the old updated MFC what
> conditions exist then.
> Can I use.NET framework only in new classes or is possible to use it
> even in old classes from the updated MFC application?
When you compile your existsing code with /clr, you can use .NET framework
classes from anywhere, including adding new code to old classes.
> I wrote in an earlier mail the following:
> If I intend to use C++ in VS2005 I can either use managed code which
> is C++/CLI which give me the possibility to mix other language such
> as C# or VB or use unmanaged code for example using MFC then I can
> not mix other language.
>
> I received the answer below
> There are two separate, somewhat independent issues:
> 1. Which platform you're targeting: native or managed
> 2. Which language (syntax) you're using: C++/CLI, ISO C++ or ISO
> C89. C++/CLI - managed only
> ISO C++ - native or managed (or mixture)
> ISO C - native only
>
> Supported languages can be mixed on either platform, so for
> example, you can use both ISO C++ and C++/CLI to write managed code
> (but only the C++/CLI classes will be usable from other .NET
> languages). In fact, there's nothing to stop you from having
> C++/CLI, ISO C++ compiled as managed, ISO C++ compiled as natice and
> ISO C89 compiled as native all in the same executable.
>
>
> Some more question on the answer.You wrote which platform you're
> targeting: native or managed?
> I assume a managed app mean that it is more or less plattform
> independent similar to Java
> and that you can mix different .NET langauges. Is that right
> conclusion?
Yes.
> Even if you have a managed app you can't use it as you can use Java
> because Java runs on most plattforms for example Unix..
> If I use managed app which plattform can the updated app be executed
> on? Can I run it on Unix(Linux)?
Maybe. The platform is the CLI. Microsoft .NET is one implementation of
the CLI, but there are others. The Mono project is an open-source CLI for
Unix, but it doesn't support everything that .NET supports yet. In practice
your WinForms+MFC app is still tied to Windows, just as it was as an MFC
app.
> Is it a condition to be able to mix several different .NET langauges
> for an application that it's a managed app?
No.
> A native app can't mix different .NET langauges?
Yes it can, but not as easily.
> If I instead used native what do I miss then?
Windows Forms and the .NET framework classes.
> Is it correct an updated app VC6/MFC to VC8 that will use the .NET
> framework must be a managed app.?
That's two ways of saying the same thing. .NET Framework app == managed
app.
> If I update a VC6/MFC to VC8 just to be able to use .NET framework
> What condition exist in the new updated application. I mean when
> changing existing code in one way or another and adding new code. Can
> I use the standard C++(ISO C++) instead of C++/CLI?. So the question
> is when can I use standard C++(ISO C++) and when do I have to use
> C++/CLI in the updated VC6/MFC to VC8 to be abler to use .NET
> framework.
You never have to use C++/CLI. When interacting with the .NET framework,
you can use C++/CLI or the older Managed Extensions for C++. Use of ISO C++
and C++/CLI are not mutually exclusive - C++/CLI is an extension of ISO C++,
so you can write 99% ISO C++ and mix in a little bit of C++/CLI here and
there where you need to interact with .NET framework class.
-cd
.
- References:
- migrating VC6 to VC8
- From: Tony Johansson
- migrating VC6 to VC8
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