I mean, the only method, I wanna use to P/Invoke into unmanaged code
and retrieve a pointer which point to a block of memory, is formed as
below,

[DllImport("stuffs.dll"), CharSet = CharSet.Ansi)]]
static extern IntPtr GetData();

The returned value is just a pointer. The content of the memory is a
Structure variable or a collection of Structure variables, which
depends on other conditions. Then,

IntPtr data = IntPtr.Zero;
data = GetData();

After that, how can I effectively get the concrete data?
Use Marshal.PtrToStructure to copy to a managed memory?  or else?

thx in advance