How Do I Initialize A Uint8* In C++ Code With Values Of The Arraylist In C#

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C++

interop

C#5.0

I am having C++ code like this

UINT8  *ptr;
extern __declspec(dllexport) void initialize_ptr(UINT8 *p_ptr)
{
    ptr = p_ptr;
}

In my C# code, i am having an ArrayList with values filled in. I wanted to set the ptr in C++ with the pointer pointing to the values in the ArrayList so that the C++ code which will take each individual values of the arraylist and proceed with the calculation.

How can i initialize the C++ pointer to the exact memory location of the arraylist in C# so that C++ code executes with the pointer data without any problem ?

Thanks...