将int *编组为C# [英] Marshalling int* to C#

问题描述

我在C ++中有一个函数 someFunc(char * arg1，int * arg2)，我想在我在C#中使用此函数(在导入DLL之后)时整理参数.

I've a function in C++ void someFunc(char* arg1, int* arg2) which I want to marshal the parameters as I use this function in C# (after importing the DLL)..

您能告诉我我在这里感到困惑时应该如何进行编组吗?

Can you pls tell me how I should marshall as I'm confused here.

[DllImport(Dllname)]
extern void someFunc([MarshallAsAttribute(UnmanagedType,LPStr)] string arg1, IntPtr arg2);

我应该在这里使用IntPtr吗?我无法通过C#传递任何int变量的地址，以便它可以在C ++中的指针中找到?

Should I use an IntPtr here? I cant pass the address of any int variable from C# so that it would land up in the pointer in C++?

推荐答案

问题是 int * 可以用于C语言中的许多不同场景. int * arg2 旨在表示.

The problem is int* can be used for a lot of different scenarios in C. How you marshal this depends a bit on what the int* arg2 is meant to represent.

例如，如果仅设置int的值，则可以将其编组为 ref int .但是，如果 int * 表示一个数组，则需要传递一个数组(但是，这不太可能，因为没有长度项，这在通过指针使用数组时很常见.).

For example, if it's just setting a value of an int, you can marshal this as ref int. However, if the int* is representing an array, you'll want to pass an array (this is unlikely, however, as there is no length term, which is common when using an array via a pointer).

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