如何编组包含未知大小的 int 数组的结构？

Question

I have a c-structure that I want to return from a c-function to c# and that structure contains an array of int and a length. So basically

struct MyStruct
{
int *arr;
int size;
} 

How should I allocate the arr in c to ensure that it can be freed in c#. And how do I decorate the corresponding structure in c# to make the marshalling possible?

Answer 1

You can't. You should allocate and free memory by same runtime library.