WinSock 开启 TCP 服务器例子

这个也是在 CSDN 上的不知道几手的代码,原帖还有个客户端的, 我用不着就懒得发了
编译命令

gcc winsock.c -o w.exe -lwsock32 -lWs2_32

// Server
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#define DEFAULT_PORT "27015"
#define DEFAULT_BUFLEN 512
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <IPHlpApi.h>
#include <stdio.h>
#pragma comment(lib, "WS2_32.lib")

int main(int argc, char ** argv)
{
	// 初始化 Winsock
	WSADATA wsaData;
	int iResult;
	iResult = WSAStartup(MAKEWORD(2,2),&wsaData);
	if(iResult != 0)
	{
		printf("WSAStartup failed: %d\n", iResult);
		return 1;
	}
	else
	{
		printf("WSAStartup success: %d\n", iResult);
	}
 
	// 获取连接属性
	struct addrinfo * result = NULL, * ptr = NULL, hints;
	ZeroMemory(&hints, sizeof(hints));
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;
	hints.ai_flags = AI_PASSIVE;
 
	iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);
	if (iResult != 0) {
		printf("getaddrinfo failed: %d\n", iResult);
		WSACleanup();
		return 1;
	}
	else
	{
		printf("getaddrinfo success: %d\n", iResult);
	}
 
	// 创建 Listen Socket 对象
	SOCKET ListenSocket = INVALID_SOCKET;
	ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
	if (ListenSocket == INVALID_SOCKET) {
		printf("Error at socket(): %ld\n", WSAGetLastError());
		freeaddrinfo(result);
		WSACleanup();
		return 1;
	}
	// 绑定连接端口
	iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);
	if (iResult == SOCKET_ERROR) {
		printf("bind failed: %d\n", WSAGetLastError());
		freeaddrinfo(result);
		closesocket(ListenSocket);
		WSACleanup();
		return 1;
	}
	else
	{
		printf("bind success %s\n",result->ai_addr);
	}
 
	// 开始监听
	if (listen(ListenSocket, SOMAXCONN) == SOCKET_ERROR) {
		printf("Error at bind(): %ld\n", WSAGetLastError());
		closesocket(ListenSocket);
		WSACleanup();
		return 1;
	}
	else
	{
		printf("Listening %s\n",DEFAULT_PORT);
	}
 
	// Accept 一个链接（阻塞）
	SOCKET ClientSocket = INVALID_SOCKET;
	ClientSocket = accept(ListenSocket, NULL, NULL);
	if (ClientSocket == INVALID_SOCKET) {
		printf("accept failed: %d\n", WSAGetLastError());
		closesocket(ListenSocket);
		WSACleanup();
		return 1;
	}
	else
	{
		puts("A client has connected");
	}
 
	// 接受一些数据
	char recvbuf[DEFAULT_BUFLEN+1];
	do {
		memset(recvbuf,0,sizeof(recvbuf));
		iResult = recv(ClientSocket, recvbuf, DEFAULT_BUFLEN, 0);
		if (iResult > 0) {
			// Echo the buffer to the console
			recvbuf[DEFAULT_BUFLEN] = 0;
			printf("Bytes received: %d, %s\n", iResult, recvbuf);
		}
		else if (iResult == 0) {
			printf("Connection closing ...\n");
		}
		else {
			printf("recv failed: %d\n", WSAGetLastError());
			closesocket(ClientSocket);
			WSACleanup();
			return 1;
		}
	} while (iResult > 0);
 
	// shutdown the send half of the connection since no more data will be sent
	iResult = shutdown(ClientSocket, SD_SEND);
	if (iResult == SOCKET_ERROR) {
		printf("shutdown failed: %d\n", WSAGetLastError());
		closesocket(ListenSocket);
		WSACleanup();
		return 1;
	}
 
	// 清理
	closesocket(ListenSocket);
	WSACleanup();
	return 0;
}