互操作填充 [英] Interop padding

问题描述

你好.我正在尝试定义 MIB_IPNET_TABLE2 以及来自C#的互操作的相关结构.现在文档说:

Hello. I am trying to define the MIB_IPNET_TABLE2 and related structures for interop from C#. Now the documentation says:

MIB_IPNET_TABLE2 结构可能包含填充，用于在 NumEntries 成员和第一个 MIB_IPNET_ROW2 数组条目中的 表成员.对齐之间也可能存在填充 表成员中的 MIB_IPNET_ROW2 阵列条目.任何访问 MIB_IPNET_ROW2 数组条目应假定可能存在填充.

The MIB_IPNET_TABLE2 structure may contain padding for alignment between the NumEntries member and the first MIB_IPNET_ROW2 array entry in the Table member. Padding for alignment may also be present between the MIB_IPNET_ROW2 array entries in the Table member. Any access to a MIB_IPNET_ROW2 array entry should assume padding may exist.

好吧..对我来说意味着什么?什么时候有填充，什么时候没有?我应将任何属性应用于结构或成员以由编组器处理吗?还是应该在C#中处理?

Okay, so.. what does it mean for me? When there is a padding and when there is not? Is there any attribute I should apply to the struct or members to have it handled by the marshaller? Or how is this supposed to be handled in C#?

感谢您的任何提示或见解！
Jan

Thanks for any hints or insight!
Jan

推荐答案

用于对齐的填充意味着，大于1个字节的类型将不会在4个字节的两组之间分散.我不知道该如何解释"这个，但我会尽力让您理解:

The padding for alignment means that a type that is larger than 1 byte will not be spread between two groups of 4 bytes. I don't know how to "explain" this, but I'll try to make you understand:

如果您声明以下结构:

typedef struct _S {
  char       a;
  char       b;
  char       c;
  int       d;
} S

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