windows c语言写一个tcp的服务端和客户端

以下是一个简单的 Windows C 语言 TCP 服务端和客户端的示例代码。服务端可以监听客户端的连接，并将客户端发送的消息回显给客户端。

服务端代码：

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

#define PORT 8080

int main() {
    WSADATA wsaData;
    SOCKET serverSocket, clientSocket;
    struct sockaddr_in serverAddress, clientAddress;
    int addrLen = sizeof(clientAddress);
    char buffer[1024];

    // 初始化 Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed.\n");
        return 1;
    }

    // 创建服务器套接字
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == INVALID_SOCKET) {
        printf("Failed to create server socket.\n");
        WSACleanup();
        return 1;
    }

    // 设置服务器地址
    memset(&serverAddress, 0, sizeof(serverAddress));
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = INADDR_ANY;
    serverAddress.sin_port = htons(PORT);

    // 绑定服务器套接字到服务器地址
    if (bind(serverSocket, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) == SOCKET_ERROR) {
        printf("Failed to bind server socket.\n");
        closesocket(serverSocket);
        WSACleanup();
        return 1;
    }

    // 监听客户端连接
    if (listen(serverSocket, SOMAXCONN) == SOCKET_ERROR) {
        printf("Failed to listen for incoming connections.\n");
        closesocket(serverSocket);
        WSACleanup();
        return 1;
    }

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

    // 接受客户端连接
    clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddress, &addrLen);
    if (clientSocket == INVALID_SOCKET) {
        printf("Failed to accept incoming connection.\n");
        closesocket(serverSocket);
        WSACleanup();
        return 1;
    }

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

    // 接收和发送数据
    while (1) {
        int bytesReceived = recv(clientSocket, buffer, sizeof(buffer), 0);
        if (bytesReceived == SOCKET_ERROR) {
            printf("Failed to receive data from client.\n");
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }

        if (bytesReceived == 0) {
            printf("Client disconnected.\n");
            closesocket(clientSocket);
            WSACleanup();
            return 0;
        }

        printf("Received %d bytes from client: %s", bytesReceived, buffer);

        if (send(clientSocket, buffer, bytesReceived, 0) == SOCKET_ERROR) {
            printf("Failed to send data to client.\n");
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }
    }

    return 0;
}

客户端代码：

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

#define PORT 8080

int main() {
    WSADATA wsaData;
    SOCKET clientSocket;
    struct sockaddr_in serverAddress;
    char buffer[1024];

    // 初始化 Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed.\n");
        return 1;
    }

    // 创建客户端套接字
    clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == INVALID_SOCKET) {
        printf("Failed to create client socket.\n");
        WSACleanup();
        return 1;
    }

    // 设置服务器地址
    memset(&serverAddress, 0, sizeof(serverAddress));
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = inet_addr("127.0.0.1");
    serverAddress.sin_port = htons(PORT);

    // 连接到服务器
    if (connect(clientSocket, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) == SOCKET_ERROR) {
        printf("Failed to connect to server.\n");
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

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

    // 发送和接收数据
    while (1) {
        printf("Enter message to send: ");
        fgets(buffer, sizeof(buffer), stdin);

        if (send(clientSocket, buffer, strlen(buffer), 0) == SOCKET_ERROR) {
            printf("Failed to send data to server.\n");
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }

        int bytesReceived = recv(clientSocket, buffer, sizeof(buffer), 0);
        if (bytesReceived == SOCKET_ERROR) {
            printf("Failed to receive data from server.\n");
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }

        if (bytesReceived == 0) {
            printf("Server disconnected.\n");
            closesocket(clientSocket);
            WSACleanup();
            return 0;
        }

        buffer[bytesReceived] = '\0';
        printf("Received %d bytes from server: %s", bytesReceived, buffer);
    }

    return 0;
}

注意：上述代码仅为示例代码，没有进行错误处理和安全性检查。在实际应用中，应该添加适当的错误处理和安全性检查。