Windows 环境下用c语言实现TCP服务器

可以使用Winsock库来实现TCP服务器。以下是一个简单的示例代码：

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

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

int main() {
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed: %d\n", iResult);
        return 1;
    }

    SOCKET listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (listenSocket == INVALID_SOCKET) {
        printf("socket failed: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    sockaddr_in service;
    service.sin_family = AF_INET;
    service.sin_addr.s_addr = INADDR_ANY;
    service.sin_port = htons(27015);

    iResult = bind(listenSocket, (SOCKADDR*)&service, sizeof(service));
    if (iResult == SOCKET_ERROR) {
        printf("bind failed: %d\n", WSAGetLastError());
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    iResult = listen(listenSocket, SOMAXCONN);
    if (iResult == SOCKET_ERROR) {
        printf("listen failed: %d\n", WSAGetLastError());
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    printf("Waiting for client to connect...\n");

    SOCKET clientSocket = accept(listenSocket, NULL, NULL);
    if (clientSocket == INVALID_SOCKET) {
        printf("accept failed: %d\n", WSAGetLastError());
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    printf("Client connected!\n");

    char recvbuf[512];
    int recvbuflen = 512;

    iResult = recv(clientSocket, recvbuf, recvbuflen, 0);
    if (iResult > 0) {
        printf("Received %d bytes: %s\n", iResult, recvbuf);
    } else if (iResult == 0) {
        printf("Connection closing...\n");
    } else {
        printf("recv failed: %d\n", WSAGetLastError());
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    iResult = shutdown(clientSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed: %d\n", WSAGetLastError());
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    closesocket(clientSocket);
    WSACleanup();

    return 0;
}

这个代码创建了一个TCP服务器，监听端口27015。当客户端连接上来后，服务器会接收客户端发送的数据，并打印出来。然后服务器会关闭连接。注意，这个代码只是一个简单的示例，实际应用中还需要进行错误处理和安全性检查。