如何将C++中的SOCKADDR_IN*参数类型转换成C#中的参数类型

将C++中的参数类型SOCKADDR_IN*映射为C#中的IntPtr参数类型的示例代码如下：

IntPtr ptrSockaddr = new IntPtr();

//ip地址
sockaddr_in sockaddr = new sockaddr_in();
sockaddr.sin_family = ADDRESS_FAMILIES.AF_INET;
sockaddr.sin_port = Ws232Util.htons(port);
sockaddr.sin_addr.s_addr = Ws232Util.inet_addr(host);
sockaddr.sin_zero = new byte[8] { 0, 0, 0, 0, 0, 0, 0, 0 };
ptrSockaddr = Marshal.AllocHGlobal(Marshal.SizeOf(sockaddr));
Marshal.StructureToPtr(sockaddr, ptrSockaddr, false);

然后将ptrSockaddr参数传入相应的方法中即可。

sockaddr_in在C#中的完整定义如下：

1、ADDRESS_FAMILIES.cs

using System;

namespace DiancaiBll
{
	public enum ADDRESS_FAMILIES : short
	{
		/// <summary>
		/// Unspecified [value = 0].
		/// </summary>
		AF_UNSPEC = 0,
		/// <summary>
		/// Local to host (pipes, portals) [value = 1].
		/// </summary>
		AF_UNIX = 1,
		/// <summary>
		/// Internetwork: UDP, TCP, etc [value = 2].
		/// </summary>
		AF_INET = 2,
		/// <summary>
		/// Arpanet imp addresses [value = 3].
		/// </summary>
		AF_IMPLINK = 3,
		/// <summary>
		/// Pup protocols: e.g. BSP [value = 4].
		/// </summary>
		AF_PUP = 4,
		/// <summary>
		/// Mit CHAOS protocols [value = 5].
		/// </summary>
		AF_CHAOS = 5,
		/// <summary>
		/// XEROX NS protocols [value = 6].
		/// </summary>
		AF_NS = 6,
		/// <summary>
		/// IPX protocols: IPX, SPX, etc [value = 6].
		/// </summary>
		AF_IPX = 6,
		/// <summary>
		/// ISO protocols [value = 7].
		/// </summary>
		AF_ISO = 7,
		/// <summary>
		/// OSI is ISO [value = 7].
		/// </summary>
		AF_OSI = 7,
		/// <summary>
		/// european computer manufacturers [value = 8].
		/// </summary>
		AF_ECMA = 8,
		/// <summary>
		/// datakit protocols [value = 9].
		/// </summary>
		AF_DATAKIT = 9,
		/// <summary>
		/// CCITT protocols, X.25 etc [value = 10].
		/// </summary>
		AF_CCITT = 10,
		/// <summary>
		/// IBM SNA [value = 11].
		/// </summary>
		AF_SNA = 11,
		/// <summary>
		/// DECnet [value = 12].
		/// </summary>
		AF_DECnet = 12,
		/// <summary>
		/// Direct data link interface [value = 13].
		/// </summary>
		AF_DLI = 13,
		/// <summary>
		/// LAT [value = 14].
		/// </summary>
		AF_LAT = 14,
		/// <summary>
		/// NSC Hyperchannel [value = 15].
		/// </summary>
		AF_HYLINK = 15,
		/// <summary>
		/// AppleTalk [value = 16].
		/// </summary>
		AF_APPLETALK = 16,
		/// <summary>
		/// NetBios-style addresses [value = 17].
		/// </summary>
		AF_NETBIOS = 17,
		/// <summary>
		/// VoiceView [value = 18].
		/// </summary>
		AF_VOICEVIEW = 18,
		/// <summary>
		/// Protocols from Firefox [value = 19].
		/// </summary>
		AF_FIREFOX = 19,
		/// <summary>
		/// Somebody is using this! [value = 20].
		/// </summary>
		AF_UNKNOWN1 = 20,
		/// <summary>
		/// Banyan [value = 21].
		/// </summary>
		AF_BAN = 21,
		/// <summary>
		/// Native ATM Services [value = 22].
		/// </summary>
		AF_ATM = 22,
		/// <summary>
		/// Internetwork Version 6 [value = 23].
		/// </summary>
		AF_INET6 = 23,
		/// <summary>
		/// Microsoft Wolfpack [value = 24].
		/// </summary>
		AF_CLUSTER = 24,
		/// <summary>
		/// IEEE 1284.4 WG AF [value = 25].
		/// </summary>
		AF_12844 = 25,
		/// <summary>
		/// IrDA [value = 26].
		/// </summary>
		AF_IRDA = 26,
		/// <summary>
		/// Network Designers OSI & gateway enabled protocols [value = 28].
		/// </summary>
		AF_NETDES = 28,
		/// <summary>
		/// [value = 29].
		/// </summary>
		AF_TCNPROCESS = 29,
		/// <summary>
		/// [value = 30].
		/// </summary>
		AF_TCNMESSAGE = 30,
		/// <summary>
		/// [value = 31].
		/// </summary>
		AF_ICLFXBM = 31
	}
}

　　

2、in_addr.cs

using System;
using System.Runtime.InteropServices;

namespace DiancaiBll
{
	[StructLayout(LayoutKind.Explicit, Size = 4)]
	public struct in_addr
	{
		[FieldOffset(0)]
		internal byte s_b1;
		[FieldOffset(1)]
		internal byte s_b2;
		[FieldOffset(2)]
		internal byte s_b3;
		[FieldOffset(3)]
		internal byte s_b4;

		[FieldOffset(0)]
		internal ushort s_w1;
		[FieldOffset(2)]
		internal ushort s_w2;

		[FieldOffset(0)]
		internal uint S_addr;

		/// <summary>
		/// can be used for most tcp & ip code
		/// </summary>
		public uint s_addr
		{
			get { return S_addr; }
			set { S_addr = value; }
		}

		/// <summary>
		/// host on imp
		/// </summary>
		public byte s_host
		{
			get { return s_b2; }
			set { s_b2 = value; }
		}

		/// <summary>
		/// network
		/// </summary>
		public byte s_net
		{
			get { return s_b1; }
			set { s_b1 = value; }
		}

		/// <summary>
		/// imp
		/// </summary>
		public ushort s_imp
		{
			get { return s_w2; }
			set { s_w2 = value; }
		}

		/// <summary>
		/// imp #
		/// </summary>
		public byte s_impno
		{
			get { return s_b4; }
			set { s_b4 = value; }
		}

		/// <summary>
		/// logical host
		/// </summary>
		public byte s_lh
		{
			get { return s_b3; }
			set { s_b3 = value; }
		}
	}
}

　　

3、in6_addr.cs

using System;
using System.Runtime.InteropServices;

namespace DiancaiBll
{
	[StructLayout(LayoutKind.Explicit, Size = 16)]
	public struct in6_addr
	{
		[FieldOffset(0)]
		public byte Byte_0;
		[FieldOffset(1)]
		public byte Byte_1;
		[FieldOffset(2)]
		public byte Byte_2;
		[FieldOffset(3)]
		public byte Byte_3;

		[FieldOffset(4)]
		public byte Byte_4;
		[FieldOffset(5)]
		public byte Byte_5;
		[FieldOffset(6)]
		public byte Byte_6;
		[FieldOffset(7)]
		public byte Byte_7;

		[FieldOffset(8)]
		public byte Byte_8;
		[FieldOffset(9)]
		public byte Byte_9;
		[FieldOffset(10)]
		public byte Byte_10;
		[FieldOffset(11)]
		public byte Byte_11;

		[FieldOffset(12)]
		public byte Byte_12;
		[FieldOffset(13)]
		public byte Byte_13;
		[FieldOffset(14)]
		public byte Byte_14;
		[FieldOffset(15)]
		public byte Byte_16;

		[FieldOffset(0)]
		public short Word_0;
		[FieldOffset(2)]
		public short Word_1;
		[FieldOffset(4)]
		public short Word_2;
		[FieldOffset(6)]
		public short Word_3;

		[FieldOffset(8)]
		public short Word_4;
		[FieldOffset(10)]
		public short Word_5;
		[FieldOffset(12)]
		public short Word_6;
		[FieldOffset(14)]
		public short Word_7;
	}
}

　　

4、sockaddr_in.cs

using System;
using System.Text;
using System.Runtime.InteropServices;

namespace DiancaiBll
{
	[StructLayout(LayoutKind.Sequential)]
	public struct sockaddr_in
	{
		public ADDRESS_FAMILIES sin_family;
		public ushort sin_port;
		public in_addr sin_addr;
		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
		public byte[] sin_zero;

		public string Host
		{
			get
			{
				sockaddr_in local = this;
				uint length = 256;
				StringBuilder builder = new StringBuilder((int)length);

				WSAData data = new WSAData();
				Ws232Util.WSAStartup(2, ref data);
				Ws232Util.WSAAddressToString(ref local, (uint)Marshal.SizeOf(local), IntPtr.Zero, builder, ref length);
				Ws232Util.WSACleanup();

				if (builder.ToString().Split(':').Length > 0)
					return builder.ToString().Split(':')[0];
				else
					return "";
			}
		}

		public string Port
		{
			get
			{
				sockaddr_in local = this;
				uint length = 256;
				StringBuilder builder = new StringBuilder((int)length);

				WSAData data = new WSAData();
				Ws232Util.WSAStartup(2, ref data);
				Ws232Util.WSAAddressToString(ref local, (uint)Marshal.SizeOf(local), IntPtr.Zero, builder, ref length);
				Ws232Util.WSACleanup();

				if (builder.ToString().Split(':').Length > 1)
					return builder.ToString().Split(':')[1];
				else
					return "";
			}
		}

		public static sockaddr_in FromString(string host, int port)
		{
			sockaddr_in sockaddr = new sockaddr_in();
			int lpAddressLength = Marshal.SizeOf(sockaddr);
			Ws232Util.WSAStringToAddress(host + ":" + port.ToString(), ADDRESS_FAMILIES.AF_INET, IntPtr.Zero, ref sockaddr, ref lpAddressLength);
			return sockaddr;
		}
	}
}

　　

5、sockaddr_in6.cs

using System;
using System.Text;
using System.Runtime.InteropServices;

namespace DiancaiBll
{
	[StructLayout(LayoutKind.Explicit, Size = 28)]
	public struct sockaddr_in6
	{
		[FieldOffset(0)]
		public ADDRESS_FAMILIES sin6_family;
		[FieldOffset(2)]
		public ushort sin6_port;
		[FieldOffset(4)]
		public uint sin6_flowinfo;
		[FieldOffset(8)]
		public in6_addr sin6_addr;
		[FieldOffset(24)]
		public uint sin6_scope_id;

		internal string Host
		{
			get
			{
				sockaddr_in6 local = this;
				uint length = 256;
				StringBuilder builder = new StringBuilder((int)length);

				WSAData data = new WSAData();
				Ws232Util.WSAStartup(2, ref data);
				Ws232Util.WSAAddressToString(ref local, (uint)Marshal.SizeOf(local), IntPtr.Zero, builder, ref length);
				Ws232Util.WSACleanup();

				if (builder.ToString().Split(':').Length > 0)
					return builder.ToString().Split(':')[0];
				else
					return "";
			}
		}

		internal string Port
		{
			get
			{
				sockaddr_in6 local = this;
				uint length = 256;
				StringBuilder builder = new StringBuilder((int)length);

				WSAData data = new WSAData();
				Ws232Util.WSAStartup(2, ref data);
				Ws232Util.WSAAddressToString(ref local, (uint)Marshal.SizeOf(local), IntPtr.Zero, builder, ref length);
				Ws232Util.WSACleanup();

				if (builder.ToString().Split(':').Length > 1)
					return builder.ToString().Split(':')[1];
				else
					return "";
			}
		}

		public static sockaddr_in6 FromString(string host, int port)
		{
			sockaddr_in6 sockaddr = new sockaddr_in6();
			int lpAddressLength = Marshal.SizeOf(sockaddr);
			Ws232Util.WSAStringToAddress(host + ":" + port.ToString(), ADDRESS_FAMILIES.AF_INET6, IntPtr.Zero, ref sockaddr, ref lpAddressLength);
			return sockaddr;
		}
	}
}

　　

6、WSAData.cs

using System;
using System.Runtime.InteropServices;

namespace DiancaiBll
{
	[StructLayout(LayoutKind.Sequential)]
	public struct WSAData
	{
		public Int16 version;
		public Int16 highVersion;

		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 257)]
		public String description;

		[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 129)]
		public String systemStatus;

		public Int16 maxSockets;
		public Int16 maxUdpDg;
		public IntPtr vendorInfo;
	}
}