Managed Wrapper, Unmanaged Pointer

[DotNetJunkies User]

Background:
I am creating a VC++ .NET wrapper for a C++ DLL; the aim is to use this wrapper in C# as shown below:

Range r = new Range( 2, 2 );
r[ 0 ][ 0 ] = new Cell( “Hello Mum� );

Range is a managed wrapper around an unmanaged range class. Vector is a managed wrapper around an unmanaged vector class. Cell is a managed wrapper around an unmanaged cell class.

Here r[ 0 ] returns a managed Vector* and r[ 0 ][ 0 ] accesses a particular Cell in the Vector.

Question:
In my wrapper class, the first indexer r[ 0 ] always returns an invalid unmanaged vector instance if I create the class instance with a pointer.

So, the following works fine using the copy constructor, if the vec has length 2 in VC++, it has a length 2 in C# …

vector* _vector;

Vector::Vector( vector& vec )
{
try
{
vector* wrappedVector = new vector( vec );
_vector = wrappedVector;
}
…
}

However, when I initialize the class by passing a pointer to an existing unmanaged vector class instance, the unmanaged vector object becomes invalid as soon as I reach the C# code (it is fine in the VC++), if the vec has length 2 in VC++, it has a length 0 in C#…

vector* _vector;

Vector::Vector( vector* vec )
{
try
{
_vector = vec;
}
…
}

Any ideas?
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