C# Socket 入门5 UPD 结构体与 C++ 通信

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C# Socket 入门5 UPD 结构体与 C++ 通信

1. 同样，我们先看看这一个比简单的结构体

代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace CSharp_Socket_5
{
     /// <summary>
     /// 通信消息格式
     /// </summary>
    [Serializable]
    [StructLayout(LayoutKind.Sequential, Pack = 1 )]
     public struct CP2PMessage
    {
         public ushort id;
    }
}

C++ 版本

struct CP2PMessage
{
WORD id;
};

2. C# 服务端，和之前的一样滴~~ 看来是不是很亲切也~

代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Runtime.InteropServices;

namespace CSharp_Socket_5
{
     class Program
    {
         /// <summary>
         /// 服务端
         /// </summary>
         /// <param name="args"></param>
         static void Main( string [] args)
        {
             // 1.创建套节字
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

             // 2.填充IP
            IPEndPoint ipe = new IPEndPoint(IPAddress.Any, 4321 );

             // 3.绑定
            socket.Bind(ipe);

             // 等待客户机连接
            Console.WriteLine( " 这个服务器, host name is {0} " , Dns.GetHostName());
            Console.WriteLine( " 等待客户端连接.... " );

             // 4.得客户机IP
            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0 );
            EndPoint remote = (EndPoint)sender;

             // 5.接收客户机数据
             byte [] buffer = new byte [ 1024 ];
            socket.ReceiveFrom(buffer, ref remote);

            CP2PMessage msg = new CP2PMessage();
            msg = (CP2PMessage)BytesToStruct(buffer, msg.GetType());

            Console.WriteLine( " 接C++收的值为:{0} " , msg.id);

            Console.ReadKey();

        }

         public static byte [] StructToBytes( object obj)
        {
             int size = Marshal.SizeOf(obj);
             byte [] bytes = new byte [size];
            IntPtr structPtr = Marshal.AllocHGlobal(size); // 分配结构体大小的内存空间
            Marshal.StructureToPtr(obj, structPtr, false ); // 将结构体拷到分配好的内存空间
            Marshal.Copy(structPtr, bytes, 0 , size);        // 从内存空间拷到byte数组
            Marshal.FreeHGlobal(structPtr);                 // 释放内存空间
             return bytes;
        }

         public static object BytesToStruct( byte [] bytes, Type type)
        {
             int size = Marshal.SizeOf(type);
             if (size > bytes.Length)
                 return null ;
            IntPtr structPtr = Marshal.AllocHGlobal(size); // 分配结构大小的内存空间
            Marshal.Copy(bytes, 0 , structPtr, size);        // 将byte数组拷到分配好的内存空间
             object obj = Marshal.PtrToStructure(structPtr, type);
            Marshal.FreeHGlobal(structPtr);
             return obj;
        }
    }
}

3. 重点了，，C++ 客户端

代码

#include < winsock2.h >
#include < stdio.h >
#pragma comment(lib, "WS2_32.lib")

struct CP2PMessage
{
    WORD id;
};

void main()
{
     // 初始化 WS2_32.dll
    WSADATA wsaData;
    ::WSAStartup(MAKEWORD( 2 , 2 ), & wsaData);

     // 1.创建套节字
    SOCKET s = ::socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

     // 2.填写服务器IP
    sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = ::htons( 4321 );
    sin.sin_addr.S_un.S_addr = ::inet_addr( " 127.0.0.1 " );

     // 3. 向服务器发送消息
    CP2PMessage msg;
    msg.id = 10 ;

    ::sendto(s, ( char * ) & msg, sizeof (msg), 0 , (sockaddr * ) & sin, sizeof (sin));
}

4. 完成了，，，这么，请看效果图！！