在Windows上使用c++语言实现socket编程

1.编写服务端代码。

```cpp
#include <iostream>
#include <winsock2.h>

using namespace std;

#pragma comment(lib, "ws2_32.lib")

#define PORT 4000
#define IP_ADDRESS "127.0.0.1"


DWORD WINAPI ClientThread(LPVOID lpParameter)
{
    SOCKET CientSocket = (SOCKET)lpParameter;
    int Ret = 0;
    char RecvBuffer[1024];

    while ( true )
    {
        memset(RecvBuffer, 0x00, sizeof(RecvBuffer));
        Ret = recv(CientSocket, RecvBuffer, 1024, 0);
        if ( Ret == 0 || Ret == SOCKET_ERROR )
        {
            cout<<"客户端退出!"<<endl;
            break;
        }
        cout<<"接收到客户信息为:"<<RecvBuffer<<endl;
    }

    return 0;
}

int main(int argc, char* argv[])
{
    WSADATA  Ws;
    SOCKET ServerSocket, ClientSocket;
    struct sockaddr_in LocalAddr, ClientAddr;
    int Ret = 0;
    int AddrLen = 0;
    HANDLE hThread = NULL;

    //Init Windows Socket
    if ( WSAStartup(MAKEWORD(2,2), &Ws) != 0 )
    {
        cout<<"Init Windows Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    //Create Socket
    ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if ( ServerSocket == INVALID_SOCKET )
    {
        cout<<"Create Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    LocalAddr.sin_family = AF_INET;
    LocalAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS);
    LocalAddr.sin_port = htons(PORT);
    memset(LocalAddr.sin_zero, 0x00, 8);

    //Bind Socket
    Ret = bind(ServerSocket, (struct sockaddr*)&LocalAddr, sizeof(LocalAddr));
    if ( Ret != 0 )
    {
        cout<<"Bind Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }
    //listen
    Ret = listen(ServerSocket, 10);
    if ( Ret != 0 )
    {
        cout<<"listen Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    cout<<"服务端已经启动"<<endl;

    while ( true )
    {
        AddrLen = sizeof(ClientAddr);
        ClientSocket = accept(ServerSocket, (struct sockaddr*)&ClientAddr, &AddrLen);
        if ( ClientSocket == INVALID_SOCKET )
        {
            cout<<"Accept Failed::"<<GetLastError()<<endl;
            break;
        }

        cout<<"客户端连接::"<<inet_ntoa(ClientAddr.sin_addr)<<":"<<ClientAddr.sin_port<<endl;

        hThread = CreateThread(NULL, 0, ClientThread, (LPVOID)ClientSocket, 0, NULL);
        if ( hThread == NULL )
        {
            cout<<"Create Thread Failed!"<<endl;
            break;
        }

        CloseHandle(hThread);
    }

    closesocket(ServerSocket);
    closesocket(ClientSocket);
    WSACleanup();

    return 0;
}

2、编写客户端代码。

```cpp
#include <iostream>
#include <winsock2.h>

using namespace std;

#pragma comment(lib, "ws2_32.lib")

#define PORT 4000
#define IP_ADDRESS "127.0.0.1"

int main(int argc, char * argv[])
{
    WSADATA Ws;
    SOCKET ClientSocket;
    struct sockaddr_in ServerAddr;
    int Ret = 0;
    int AddrLen = 0;
    HANDLE hThread = NULL;
    char SendBuffer[MAX_PATH];

    //Init Windows Socket
    if ( WSAStartup(MAKEWORD(2,2), &Ws) != 0 )
    {
        cout<<"Init Windows Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }
    //Create Socket
    ClientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if ( ClientSocket == INVALID_SOCKET )
    {
        cout<<"Create Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    ServerAddr.sin_family = AF_INET;
    ServerAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS);
    ServerAddr.sin_port = htons(PORT);
    memset(ServerAddr.sin_zero, 0x00, 8);

    Ret = connect(ClientSocket,(struct sockaddr*)&ServerAddr, sizeof(ServerAddr));
    if ( Ret == SOCKET_ERROR )
    {
        cout<<"Connect Error::"<<GetLastError()<<endl;
        return -1;
    }
    else
    {
        cout<<"连接成功!"<<endl;
    }

    while ( true )
    {
        cin.getline(SendBuffer, sizeof(SendBuffer));
        Ret = send(ClientSocket, SendBuffer, (int)strlen(SendBuffer), 0);
        if ( Ret == SOCKET_ERROR )
        {
            cout<<"Send Info Error::"<<GetLastError()<<endl;
            break;
        }
    }

    closesocket(ClientSocket);
    WSACleanup();

    return 0;
}

对代码进行编译

g++ -o server server.cpp -L ./ -lWS2_32
g++ -o client client.cpp -L ./ -lWS2_32

3.客户端与服务端实现交互。
先打开服务器端

再打开客户端

服务器端变化

在客户端输入数据

在服务器端接收到的数据如下

4.用wireshark捕捉对应端口的数据。
打开wireshark 在adapter for loopback traffic capture链接下 捕捉48594服务器的端口

再次传输数据
得到

可以看到传递的信息
数据：hjt（从客户端传到服务端）

捕获成功。
分析TCP

MAC:
IP:172.0.0.1
TCP:6
Data:686a74