Managed C++/CLI

Unable to access variables.

1-Jun-09 13:15

Thanks. Microsoft doesnt like CLI period. Sucks.
Geez..I have been creating so many workarounds.

jobin0070071-Jun-09 13:18

1-Jun-09 13:18

Unable to access variable. Suppose I wanted to access a integer array a[12] stored in my Unmanaged class.
I can only declare pointers inside the ref class. So how do I access the integer array from C#. C# only allows pointers as unsafe. I need to check if each a[i] has a value <0. It seems very hard to do this? Any help?

*******************Managed.cpp*********************************
namespace Managed
{
public ref class ManagedCLR
{
public:
ManagedCLR (void)
{
pObj = new UNMANAGEDNAMESPACE.Data();
}
~ManagedCLR(void)
{
delete pObj;
}
void EntryPoint(void)
{
//pass through to the unmanaged object
pObj->EntryPointUnmanged(); //Here the managed program accesses my unmanaged program.

}
private:
UNMANAGEDNAMESPACE.Data *pObj; //Here my Unmanaged Class is referenced through a pointer.
};

jobin0070071-Jun-09 13:21

1-Jun-09 13:21

OOps. I guess I can use the help from above.

http://www.codeproject.com/Forums/3785/Managed-Cplusplus-CLI.aspx[^]

jobin0070071-Jun-09 13:27

1-Jun-09 13:27

Actually, how would I use properties with arrays???????????

jobin0070071-Jun-09 13:54

1-Jun-09 13:54

Found a solution.

I did this in the managed.cpp file

namespace Managed
{
public ref class ManagedCLR
{
public:
ManagedCLR (void)
{
pObj = new UNMANAGEDNAMESPACE.Data();
}
~ManagedCLR(void)
{
delete pObj;
}
void EntryPoint(void)
{
//pass through to the unmanaged object
pObj->EntryPointUnmanged(); //Here the managed program accesses my unmanaged program.

}

int ArrayResult(int i)
{
return Unamanaged::Array[i];

}
private:
UNMANAGEDNAMESPACE.Data *pObj; //Here my Unmanaged Class is referenced through a pointer.
};

Mark Salsbery1-Jun-09 17:25

No Intellisense support in VC10 for C++/CLI!!!

1-Jun-09 17:25

You could also return a managed array copy of the unmanaged array
as shown in the answer here:

Converting from unmanaged array to managed array[^]

Or use the Marshal.Copy Method (IntPtr, Int32[], Int32, Int32)[^] to do the above in 2 lines.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

small_mountain28-May-09 7:05

small_mountain

28-May-09 7:05

The horror!! The horror!!

Boris Jabes (MSFT) has just revealed in a VC++ blog post (in the comments no less; I wonder when we'd have found this out if Sunil Joshi had not asked about it) that Visual Studio 2010 Intellisense, you know, that incredibly fast and reliable rearchitecture of Intellisense that we've all been waiting for, will not support C++/CLI!

http://blogs.msdn.com/vcblog/archive/2009/05/27/rebuilding-intellisense.aspx

This is stunning to me. Boris's statement is effectively that "we don't think you spend all that much of your time in C++/CLI anyway!" Puh!

If you are at all invested in C++/CLI, please head over to that blog post and add a comment indicating your displeasure with this disturbing turn of events.

Thanks,

Eric

Re: No Intellisense support in VC10 for C++/CLI!!! [modified]

teejayem28-May-09 7:27

teejayem

28-May-09 7:27

Wow, I thought it was just an issue in the beta. No wonder intellisense is faster! it's doing half the work. This really blows (to put it lightly).

Don't be overcome by evil, but overcome evil with good

Mark Salsbery28-May-09 7:31

28-May-09 7:31

Yeah, that really blows.

A main reason I dropped C++/CLI for new development a while back.

Still use it as little as possible - for interop, but that's it.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

modified on Thursday, May 28, 2009 1:55 PM

led mike28-May-09 11:29

led mike

28-May-09 11:29

Intellisense is for sissys Poke tongue | ;-P

Real programmers use vi. Jig | [Dance]

BTW today is Friday for me, have a great weekend Beer | [beer]

Mark Salsbery28-May-09 11:32

28-May-09 11:32

led mike wrote:
Intellisense is for sissys

Yeah, but to me it reflects on just how little MS is putting into
the C++/CLI, which is pretty much nothing else. I would have loved
it as a first-class .NET programming language! Smile | :)

Cheers!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

led mike4-Jun-09 4:52

led mike

4-Jun-09 4:52

BTW, did you see the followup just below about VC10 intellisense. You are getting hooked up baby!!!

Jig | [Dance]

Mark Salsbery4-Jun-09 5:02

4-Jun-09 5:02

Heh yeah....but like you said, Intellisense is for sissys.

Intellisense won't make it a first=class .net language. I want to see C++/CLI usable
everywhere C# is, with all the same VS tools!

I spend so much more time with C# now, that when I go back to do some C++/CLI,
it feels like I can't do anything....weird Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

small_mountain1-Jun-09 1:39

small_mountain

1-Jun-09 1:39

*** UPDATE ***

Boris Jabes has now posted a clarification in the comments of the referenced blog post stating that the lack of C++/CLI Intellisense support in Visual Studio 2010 is temporary and will be remedied as soon as possible after Visual Studio 2010 ships. This is certainly an improvement compared to the original statement, which did not say anything about the lack of C++/CLI support being temporary.

http://blogs.msdn.com/vcblog/archive/2009/05/27/rebuilding-intellisense.aspx

N a v a n e e t h1-Jun-09 3:14

N a v a n e e t h

1-Jun-09 3:14

That's a great news. I remember Herb Sutter saying future versions of VS will have good support for C++/CLI. But Boris really surprised me.

Navaneeth

How to use google | Ask smart questions

conver "System::String ^" to std::String

Stuart Dootson2-Jun-09 0:26

Stuart Dootson

2-Jun-09 0:26

As with all other combinations of C++, C# and different versions of Visual Studio, I suspect I'll be trusting Visual Assist X[^] to provide me with decent Intellisense Smile | :)

They don't yet have VS2010 support, but judging by their track record (I've been using the product for 8/9 years....), they'll have support pretty soon after VS2010 is released.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

AntoniP28-May-09 1:18

AntoniP

28-May-09 1:18

Hello

I am trying to convert from "String ^" to std::String on VC++ 2005. I use this piece of code:

std::string s;
String ^ ss = "hello";
s = ss;

I have got the following error:
error C2679: binary '=' : no operator found which takes a right-hand operand of type 'System::String ^' (or there is no acceptable conversion)

Any idea?

Thanks

N a v a n e e t h28-May-09 2:39

N a v a n e e t h

28-May-09 2:39

You need to work with Marshal::StringToHGlobalAnsi

String^ ss = "hello";
const char* characters = reinterpret_cast<const char*>(Marshal::StringToHGlobalAnsi(ss).ToPointer());
std::string s(characters);

Navaneeth

How to use google | Ask smart questions

Mark Salsbery28-May-09 7:38

28-May-09 7:38

What about FreeHGlobal()? Memory leak? Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: conver "System::String ^" to std::String [modified]

N a v a n e e t h28-May-09 15:30

N a v a n e e t h

28-May-09 15:30

Forgot about that D'Oh! | :doh:

Thanks

Navaneeth

How to use google | Ask smart questions

Mark Salsbery28-May-09 7:51

28-May-09 7:51

String ^ss = "hello";
IntPtr ps = Marshal::StringToHGlobalAnsi(ss);
std::string s((char*)ps.ToPointer());
Marshal::FreeHGlobal(ps);

With VS 2008, there's also

#include <msclr\marshal_cppstd.h>
...
    String ^ss = "hello";
    std::string s(msclr::interop::marshal_as<std::string>(ss));

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

modified on Thursday, May 28, 2009 5:28 PM

tecnico.antonio28-May-09 23:33

tecnico.antonio

28-May-09 23:33

Thanks!!

Mark Salsbery29-May-09 5:57