在C ++ CLI中将本机数组的Memcpy映射到托管数组 [英] Memcpy of native array to managed array in C++ CLI

问题描述

我这样做吗？

我得到一个指向本机数组的指针，需要复制到一个托管数组。使用memcpy（）和pin_ptr。

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;
unsigned int arrayCount;
// get pArray & arrayCount (from a COM method) 

ManagedClass->ByteArray = gcnew array<Byte,1>(arrayCount)
pin_ptr<System::Byte> pinPtrArray = &ManagedClass->ByteArray[0];
memcpy_s(pinPtrArray, arrayCount, pArray, arrayCount);

arrayCount是pArray的实际长度，所以不是真的担心这方面。看看代码和数组是从向量复制的。

arrayCount is the actual length of pArray, so not really worried about that aspect. Looked at the code and the array is copied from a vector. So I can set the managed array size safely.

推荐答案

你几乎可以做到：

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

Marshal :: Copy不安全，在托管C ++中始终使用固定指针。

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

编辑：如果需要，您可以检查长度以确保memcpy不会超过边界，例如：

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)

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