如何将 c 结构从 dll 转换为 C# [英] How do I convert c struct from dll to C#

问题描述

我正在将应用程序从 C++ 转换为 C#，并且对处理导入结构的正确方法有疑问.我正在尝试将结构从 c dll 转换为 c# c 中的结构看起来像这样

I am converting a application from c++ to C# and have a question about the proper way to handle importing structs. I am attempting to convert a struct from a c dll into c# The struct in c looks like this

typedef struct card_info
{
  ushort r;
  ushort s;
  enum_a a;
  usinged long ul;
  ushort n;
  ushort* b;
  ushort id;
} CARD_INFO;

当我使用 [StructLayout(LayoutKind.Sequentaial)] 时，数组的大小在 C# 中为 20 个字节.但是，如果看看我的工作 C++ 代码，它是 24 个字节.我把我的 c# 改成这样:

when i use [StructLayout(LayoutKind.Sequentaial)] the size of the array is 20 bytes in c#. However, if take a look at my working c++ code it is 24 bytes. I changed my c# to look like this:

[StructLayout(LayoutKind.Explicit)]
public struct CardInfo
{
  [FieldOffset(0) public ushort r;
  [FieldOffset(2) public ushort s;
  [FieldOffset(4) public EnumA a;
  [FieldOffset(8) public ushort ul;
  [FieldOffset(12) public ushort n;
  [FieldOffset(16) public UInt32 b;
  [FieldOffset(20) public ushort id;
}

这似乎可以编译，但我不相信这是执行此操作的正确方法.请告诉我这是否正确或是否有更好的方法.

This seems to compile but I'm not convinced this is the correct way to go about doing this. Please let me know if this is correct or if there is a better way.

谢谢

推荐答案

usinged long ul;

这是一个错字，但这绝对不是一个 ushort，而是一个 uint.

It's a typo, but that definitely isn't a ushort, it's an uint.

也不要使用FieldOffset，让编译器自己解决.现在 Marshal.SizeOf() 将返回 24，插入适当数量的填充.b 成员应该是 IntPtr btw.

Don't use FieldOffset either, let the compiler figure it out. Now Marshal.SizeOf() will return 24, the proper amount of padding is inserted. The b member should be IntPtr btw.

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