完成一对一的Socket客户端与服务器程序（85-90分） （1）输出每个步骤过程及必要信息，如：监听消息，ip是多少，端口是多少。如出错，则提示具体哪步出错及出错信息 （2）实现客户端的服务器的对话 （3）客户端输入quit后服务器关闭

以下是一对一的Socket客户端与服务器程序，具有85分-90分的基本功能：

服务器端代码：

#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#pragma comment(lib, "Ws2_32.lib")

#define MAXBUFF 1024
#define PORT 9999

int main() {
    WSADATA wsaData;
    SOCKET serverSock, clientSock;
    struct sockaddr_in serverAddr, clientAddr;
    char recvBuff[MAXBUFF], sendBuff[MAXBUFF];
    int clientAddrLen = sizeof(clientAddr);
    int recvLen, sendLen;
    
    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed with error: %d\n", WSAGetLastError());
        return 1;
    }

    // 创建服务器套接字
    serverSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (serverSock == INVALID_SOCKET) {
        printf("socket failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 绑定服务器套接字到端口号
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    serverAddr.sin_port = htons(PORT);

    if (bind(serverSock, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
        printf("bind failed with error: %d\n", WSAGetLastError());
        closesocket(serverSock);
        WSACleanup();
        return 1;
    }

    // 开始监听客户端连接请求
    if (listen(serverSock, SOMAXCONN) == SOCKET_ERROR) {
        printf("listen failed with error: %d\n", WSAGetLastError());
        closesocket(serverSock);
        WSACleanup();
        return 1;
    }

    printf("Server is listening on port %d...\n", PORT);

    // 接受客户端连接请求
    clientSock = accept(serverSock, (struct sockaddr*)&clientAddr, &clientAddrLen);
    if (clientSock == INVALID_SOCKET) {
        printf("accept failed with error: %d\n", WSAGetLastError());
        closesocket(serverSock);
        WSACleanup();
        return 1;
    }

    printf("Client connected from %s:%d.\n", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));

    // 与客户端进行对话
    while (1) {
        // 接收客户端消息
        memset(recvBuff, 0, MAXBUFF);
        recvLen = recv(clientSock, recvBuff, MAXBUFF, 0);
        if (recvLen == SOCKET_ERROR) {
            printf("recv failed with error: %d\n", WSAGetLastError());
            closesocket(clientSock);
            closesocket(serverSock);
            WSACleanup();
            return 1;
        }

        printf("Received message from client: %s\n", recvBuff);

        // 判断是否退出
        if (strcmp(recvBuff, "quit\n") == 0) {
            printf("Client disconnected.\n");
            break;
        }

        // 发送消息给客户端
        printf("Enter message to send to client: ");
        fgets(sendBuff, MAXBUFF, stdin);
        sendLen = send(clientSock, sendBuff, strlen(sendBuff), 0);
        if (sendLen == SOCKET_ERROR) {
            printf("send failed with error: %d\n", WSAGetLastError());
            closesocket(clientSock);
            closesocket(serverSock);
            WSACleanup();
            return 1;
        }
    }

    // 关闭套接字，清理Winsock库
    closesocket(clientSock);
    closesocket(serverSock);
    WSACleanup();

    return 0;
}

客户端代码：

#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#pragma comment(lib, "Ws2_32.lib")

#define MAXBUFF 1024
#define PORT 9999

int main() {
    WSADATA wsaData;
    SOCKET clientSock;
    struct sockaddr_in serverAddr;
    char recvBuff[MAXBUFF], sendBuff[MAXBUFF];
    int recvLen, sendLen;
    
    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed with error: %d\n", WSAGetLastError());
        return 1;
    }

    // 创建客户端套接字
    clientSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSock == INVALID_SOCKET) {
        printf("socket failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 连接服务器端口号
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serverAddr.sin_port = htons(PORT);

    if (connect(clientSock, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
        printf("connect failed with error: %d\n", WSAGetLastError());
        closesocket(clientSock);
        WSACleanup();
        return 1;
    }

    printf("Connected to server on port %d.\n", PORT);

    // 与服务器进行对话
    while (1) {
        // 发送消息给服务器
        printf("Enter message to send to server: ");
        fgets(sendBuff, MAXBUFF, stdin);
        sendLen = send(clientSock, sendBuff, strlen(sendBuff), 0);
        if (sendLen == SOCKET_ERROR) {
            printf("send failed with error: %d\n", WSAGetLastError());
            closesocket(clientSock);
            WSACleanup();
            return 1;
        }

        // 接收服务器消息
        memset(recvBuff, 0, MAXBUFF);
        recvLen = recv(clientSock, recvBuff, MAXBUFF, 0);
        if (recvLen == SOCKET_ERROR) {
            printf("recv failed with error: %d\n", WSAGetLastError());
            closesocket(clientSock);
            WSACleanup();
            return 1;
        }

        printf("Received message from server: %s\n", recvBuff);

        // 判断是否退出
        if (strcmp(sendBuff, "quit\n") == 0) {
            printf("Closing connection.\n");
            break;
        }
    }

    // 关闭套接字，清理Winsock库
    closesocket(clientSock);
    WSACleanup();

    return 0;
}

这段代码实现了基本的客户端和服务器端的对话，并支持客户端输入quit后服务器关闭的功能。客户端和服务器端都在本地运行，服务器监听端口号9999。