migrating from Visual Studio .NET 2003 to Visual Studio 2005

[mayag]

Hello all,

I'd very grateful for your help with compilation error I get after migrating from Visual Studio .NET 2003 to Visual Studio 2005.

class A is a managed class which contains pointer pPtr to unmanaged class as public member
class B is a managed class, derived from A.
In constructor of B there is an initialization of pPtr

after migrating from Visual Studio .NET 2003 to Visual Studio 2005 I get a compilation error:
cannot access a private member of class A (pPtr)

I'm using Old Syntax.

Thanks in advance,
Maya

[bernardos]

Hi Mayag,

Porting 2003 to 2005 is easyier if you adopt the new C++ CLI syntax :

-> managed pointers are with '^' (instead of '*') and other things.
-> change your A and B definitions to 'public ref class A' (to port it into new syntax)

-> Be sure your unmanaged object is after a 'public:' (it's 'private' by default).
-> Take a look at your new project (migration from 2003 to 2005): visual 2005 add a /Zi flag -> you have to remove it (Zi allow old syntax).

Bernardos

[mayag]

Hi,

thank you for your reply.
I need to use an old syntax...

[adminforum]

Hi,

We ported Marilou from old syntax to new syntax. Marilou contains C++ CLI and C++ native code. Using new syntax (for the CLI parts ) all is working fine. I think you may have to port it ...

You do not have to change anything in your C++ native code. Then changing to new CLI syntax will let you use Visual 2008 for example. Using old one you will always have problem in the future.

Admin

[mayag]

Here is a code sample that demonstrates the problem.
Please let me know if you have any other idea.

1) There is unmanaged class Singleton:

class Singleton {

public:

static Singleton* GetInstance();

private:

static Singleton * m_s;
...
};


2) managed base class A:


public class _gc A {

public:

Singleton * m_a;

};


3) managed derived class B :

public class _gc B : public A {
...

};


B::B() : A()
{
m_a = Singleton :: GetInstance(); // COMPILATION ERROR : cannot access private member in A
}

[adminforum]

Compile OK with Visual 2005 :

// singleton.cpp : main project file.

#include "stdafx.h"

using namespace System;

class Singleton
{
public:
static Singleton* GetInstance() {return(m_s); }

private:
//declare your variable existance
static Singleton * m_s;
};

//create static memory for this variable
Singleton * Singleton::m_s=0;

public ref class A
{
public:
Singleton * m_a;

A() {}
};

public ref class B: public A
{
public:
B();
};

B::B() : A()
{
m_a = Singleton :: GetInstance();
}


int main(array<System::String ^> ^args)
{
Console::WriteLine(L"Hello World");
return 0;
}