How to pass an array from a c++ library to c#

Question

I'm writing a plugin for this c++ physics library for Unity3d. The library is a superset of Box2D with particle simulation added. In the c++ library there is a function that returns an array of 2d vector objects for all the particles. I'm wondering how I could pass this back to Unity so I can draw them? I Cant pass objects between the library and Unity. Could I pass a 2d array of floats? I heard that I should instantiate an array of the correct size in Unity in c#, then pass it to the c++ function where all the data will be filled in, then pass it back to Unity (this is to help avoid memory problems in c++) How would you write this in c++? Alternatively could I use an out paramater to do this? And how would you write that?

may this two link helps you .its msdn corner link is social.msdn.microsoft.com/Forums/en-US/… — Ferrakkem Bhuiyan
– Ferrakkem Bhuiyan, Commented Jan 30, 2014 at 18:20
C++ to C# use CoTaskMemAlloc family of functions on the C++ side. You can find information about this on msdn.microsoft.com/en-us/library/ms692727 — Ferrakkem Bhuiyan
– Ferrakkem Bhuiyan, Commented Jan 30, 2014 at 18:21

Idov · Accepted Answer · 2014-01-30 19:00:33Z

1

You can declare the method in your C# code as returning IntPtr and then convert it to the array you need (an array of the managed version of the objects you have in your C++ code) .

answered Jan 30, 2014 at 19:00

Idov

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