在windows中用C++实现：server端TCP通讯，当client端通讯中断，server端重新监听

您可以使用以下代码实现在Windows中使用C语言实现server端TCP通讯，在client端通讯中断时，server端重新监听：

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

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

int main() {
    WSADATA wsaData;
    SOCKET listenSock, clientSock;
    struct sockaddr_in listenAddr, clientAddr;
    int clientLen, ret;

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

    // 创建server端socket
    listenSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (listenSock == INVALID_SOCKET) {
        printf("socket failed: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 绑定server端socket到地址
    listenAddr.sin_family = AF_INET;
    listenAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    listenAddr.sin_port = htons(12345);
    ret = bind(listenSock, (struct sockaddr *)&listenAddr, sizeof(listenAddr));
    if (ret == SOCKET_ERROR) {
        printf("bind failed: %d\n", WSAGetLastError());
        closesocket(listenSock);
        WSACleanup();
        return 1;
    }

    // 监听client的连接请求
    ret = listen(listenSock, 5);
    if (ret == SOCKET_ERROR) {
        printf("listen failed: %d\n", WSAGetLastError());
        closesocket(listenSock);
        WSACleanup();
        return 1;
    }

    // 等待client的连接
    clientLen = sizeof(clientAddr);
    clientSock = accept(listenSock, (struct sockaddr *)&clientAddr, &clientLen);
    if (clientSock == INVALID_SOCKET) {
        printf("accept failed: %d\n", WSAGetLastError());
        closesocket(listenSock);
        WSACleanup();
        return 1;
    }

    // 收到client的连接请求后开始通讯，这里不再赘述...

    // 循环监听client的连接，当client连接中断时重新监听
    while (1) {
        ret = recv(clientSock, buffer, sizeof(buffer), 0);
        if (ret == SOCKET_ERROR) {
            printf("recv failed: %d\n", WSAGetLastError());
            closesocket(clientSock);
            closesocket(listenSock);
            WSACleanup();
            return 1;
        }
        else if (ret == 0) {
            printf("Connection closed.\n");
            closesocket(clientSock);

            Sleep(1000);  // 延迟1秒钟再重新监听，防止CPU占用率过高
            clientLen = sizeof(clientAddr);
            clientSock = accept(listenSock, (struct sockaddr *)&clientAddr, &clientLen);
            if (clientSock == INVALID_SOCKET) {
                printf("accept failed: %d\n", WSAGetLastError());
                closesocket(listenSock);
                WSACleanup();
                return 1;
            }
            printf("Connection re-established.\n");
        }
        else {
            // 处理client发来的数据
            printf("Received data: %s\n", buffer);
        }
    }
}

注意：以上代码仅作演示用途，还需要进行错误处理和添加适当的逻辑，以确保程序的正确性和稳定性。