converting C to C# code

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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.

C++

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;

Thank you in Advance.

Posted 27-Nov-11 18:28pm

rashmi.muttanna

Updated 27-Nov-11 18:29pm

JF2015

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-11-27T18:52:00

This is done using System.Runtime.InteropServices and explicit structure layout with attributes specifying offset for each field explicitly.

C#

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;
        }

This is a fully equivalent definition without nested structures:

C#

[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;
}

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

converting C to C# code

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