COM Interop中的内存释放的责任 [英] Responsibility for memory deallocation in COM Interop

问题描述

我正在使用由.NET dll提供的C ++代码服务，我通过COM Interop访问。

I'm working on a C++ code consuming services provided by a .NET dll, which I'm accessing via COM Interop. I'm writing both the C++ and C# side.

其中一个被dll暴露的方法是从C ++调用的，要求dll
以返回包含某些信息的已分配字节数组。在我的C＃代码中创建该方法后，.tlb生成器将它暴露如下：

One of the methods that is exposed by the dll and is called from the C++, asks the dll to return an allocated byte array containing some information. After creating that method in my C# code, the .tlb generator exposed it as follows:

HRESULT _stdcall DownloadData(
                        [out] SAFEARRAY(unsigned char)* outputBuf);

测试表明，当我根据需要发送指针时，我得到缓冲区分配
并填充了我需要的信息，但我不明白在这种情况下，它的责任是（C＃\C ++）释放这个内存和如何。

Testing has shown that when I send the pointer as required I do get the buffer allocated and filled with the information I need, but I don't understand in this scenario whose responsibility it is (C#\C++) to deallocate this memory and how.

任何咨询？谢谢。

推荐答案

标准 COM内存分配规则仍适用于interop。这是调用者（使用C＃DLL的客户端代码）发布 outputBuf 数组的责任（使用 SafeArrayDestroy ）。

The standard COM memory allocation rules still apply to interop. It's the responsibility of the caller (the client code consuming the C# DLL) to release outputBuf array (using SafeArrayDestroy).

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