Passing strings to C++ DLL

I am attempting to write a .NET wrapper for a C++ DLL file, but am having
problems with passing strings as parameters. How should I be writing my C#
function call when the C header file is definined as taking a char * as an
argument? For example the C++ header says
SDCERR GetCurrentConfig(DWORD *num, char *name);
I am using Uint for the *num parameter, which returns the correct value
but for *name, I always get back a string of 6 squares. I have tried using
string, StringBuilder and char arrays, and passing by ref and not, but
always get the same result.
Connected to this I am also having problems with passing structures for
C++ functions - the structures contain strings as well. Whenever I call a
function that requires a structure as a parameter, I always get a
NotSupportedException, does this just mean that I have defined my structure
incorrectly? Do I have to initailise the structure beforehand (have tried
this but still didn't work)?
I am using Visual Studio 2005, and if it makes a difference it is for a
Compact Framework device. Thanks in advance for any help.

Andy Baker



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