固定空数组 [英] Pinning an empty array

问题描述

在C ++ / CLI中，是否可以固定不包含元素的数组？

In C++/CLI, is it possible to pin an array that contains no elements?

例如

array<System::Byte>^ bytes = gcnew array<System::Byte>(0);
pin_ptr<System::Byte> pin = &bytes[0]; //<-- IndexOutOfRangeException occurs here

MSDN给出的建议不包括空数组。
http://msdn.microsoft.com/en- us / library / 18132394％28v = VS.100％29.aspx

The advice given by MSDN does not cover the case of empty arrays. http://msdn.microsoft.com/en-us/library/18132394%28v=VS.100%29.aspx

另外，你可能想知道为什么我要固定一个空数组的值。简单的答案是，我想要处理空和非空数组相同的代码简单。

As an aside, you may wonder why I would want to pin an empty array. The short answer is that I want to treat empty and non-empty arrays the same for code simplicity.

推荐答案

不， pin_ptr<> ;.你可以回退到GCHandle来实现相同：

Nope, not with pin_ptr<>. You could fallback to GCHandle to achieve the same:

using namespace System::Runtime::InteropServices;
...
    array<Byte>^ arr = gcnew array<Byte>(0);
    GCHandle hdl = GCHandle::Alloc(arr, GCHandleType::Pinned);
    try {
        unsigned char* ptr = (unsigned char*)(void*)hdl.AddrOfPinnedObject();
        // etc..
    }
    finally {
        hdl.Free();
    }

听起来你应该使用 List< Byte> ; ^ 改为btw。

Sounds to me you should be using List<Byte>^ instead btw.

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