Thread Subject: How to pass C# object or data to Dll made from Matlab

Hi All, greeting!

If I have a C# object or data. For example in C#


Bitmap img = new Bitmap();
double[,] data = new double[100,100];


How to pass img and data to a Dll made from Matlab M file?


function object_handle = GetObjectFromCSharp(object)
   ....
   %Do something with object then return the object handle so C#
   %calling code can use.
   ....
end

A practical case is Bitmap image:

in C#:

Bitmap img = Bitmap(filename);
Bitmap new_img = MatlabDll.ProcessBitmap(img);

Where ProcessBitmap() is a function.

function out = ProcessBitmap(data)
    .....
    out = DoSomething(data);
   .....
end


The key is not passing filename to MatlabDll but data object or handle or pointer/reference (for C/C++).

Thanks in advance.
Chang