hy everybody,

I'm accessing a function of a managed-c++-dll within my c#-application.
Therefore I encountered following troubles:
In my c#-app I have got a byte[]-array, which should somehow be mapped to a
char* in my managed-c++-function.
Here is the prototype:
---------------------- managed c++ class library
project -------------------------------
void MyFunction(char* buffer)
{
   buffer = "Hello from managed c++!";
}
----------------------------------------------------------------------------
------------

in c# I'm using this function like this:
-----------------------
c#-application -------------------------------------------------
[DllImport("c++ClassLib.dll")]                        // import the c++ dll
private extern static void MyFunction(ref byte[] byteStream);

within any function, for example button1-Click()
{
   byte[] byteStream = new byte[4000];        // create new byte stream
   MyFunction(ref byteStream);                    // call c++ function
   MessageBox.Show(byteStream.toString());        // test-output the data
}
----------------------------------------------------------------------------
------------

The above code works (means throws no exception or something like this), but
has not the desired effect (that is, a displayed messagebox that says "Hello
from managed c++!"). So what I want to do in the c++-dll is to write
something into the byteStream that is provided by the c#-application).

Under no circumstances I can change the byte-stream to any other datatype
(because it is provided to me by another function), nor can I change the
char*-buffer in my c++-dll, because it is used by another external function,
too.
On the other hand, I could use some "intermediate" data types like an Array
if this would make things work (that is first converting the byteStream to
the Array, call the function, and within MyFunction convert the Array back
to char*).

I appreciate your help sincerely,

ekim!