Memcpy of native array to managed array in C++ CLI

Question

Am I doing this right?

I get a pointer to a native array and need to copy to a managed array. Use memcpy() with a pin_ptr.

unsigned char* pArray;
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Answer 1

You are doing it almost right:

pin_ptr<Byte> pinPtrArray = &ManagedClass.ByteArray[ManagedClass.ByeArray->GetLowerBound(0)];

Marshal::Copy is not safe and not as fast. Always use pinned pointers in managed C++.

Edit: If you want to, you can check the length to make sure the memcpy won't exceed the bounds first, e.g.:

if (arrayCount > ManagedClass.ByteArray.Length)
    (throw Out of bounds copy exception)

Answer 2

That works, but isn't safe. You'll blow the garbage collected heap to smithereens when you get arrayCount wrong. Very hard to diagnose.

Marshal::Copy() is safe and just as fast.