将C转换为C#代码

问题描述

是否存在与C联合typedef等效的C#?
我应该如何将以下代码转换为c#..
任何人都可以用C#等效代码来帮助我.

Is there a C# equivalent to the C union typedef?
how should i convert the following code into c#..
Can any one Please Help me with the C# equivalent Code.

typedef struct in_addr {
  union {
    struct {
      u_char s_b1,s_b2,s_b3,s_b4;
    } S_un_b;
    struct {
      u_short s_w1,s_w2;
    } S_un_w;
    u_long S_addr;
  } S_un;
} IN_ADDR, *PIN_ADDR, FAR *LPIN_ADDR;

谢谢Advance.

Thank you in Advance.

推荐答案

using System.Runtime.InteropServices;

//...

        [StructLayout(LayoutKind.Explicit)]
        struct BytePart {
            [FieldOffset(0)]
            public byte B1;
            [FieldOffset(1)]
            public byte B2;
            [FieldOffset(2)]
            public byte B3;
            [FieldOffset(3)]
            public byte B4;
        }

        [StructLayout(LayoutKind.Explicit)]
        struct ShortPart {
            [FieldOffset(0)]
            public ushort W1;
            [FieldOffset(2)]
            public ushort W2;
        }

        [StructLayout(LayoutKind.Explicit)]
        struct InAddress {
            [FieldOffset(0)]
            public BytePart BytePart;
            [FieldOffset(0)]
            public ShortPart ShortPart;
            [FieldOffset(0)]
            ulong Address;
        }

这是完全等效的定义，没有嵌套结构:

This is a fully equivalent definition without nested structures:

[StructLayout(LayoutKind.Explicit)]
struct InAddress {
    //bytes:
    [FieldOffset(0)]
    public byte B1;
    [FieldOffset(1)]
    public byte B2;
    [FieldOffset(2)]
    public byte B3;
    [FieldOffset(3)]
    public byte B4;
    //words:
    [FieldOffset(0)]
    public ushort W1;
    [FieldOffset(2)]
    public ushort W2;
    //long address:
    [FieldOffset(0)]
    ulong Address;
}

参见:
http://msdn.microsoft.com/en-us/library/system. runtime.interopservices.structlayoutattribute.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system. runtime.interopservices.fieldoffsetattribute.aspx [ ^ ].

—SA

See:
http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.structlayoutattribute.aspx[^],
http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.fieldoffsetattribute.aspx[^].

—SA

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