TCP模式的一个服务器和多个客户端通信

 服务端

#define  _WINSOCK_DEPRECATED_NO_WARNINGS 
#define _CRT_SECURE_NO_WARNINGS
#include 
#include 
#pragma comment(lib,"ws2_32.lib")
#include 
#include 
#include 
#include 

客户端

#define  _WINSOCK_DEPRECATED_NO_WARNINGS 
#define _CRT_SECURE_NO_WARNINGS

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

DWORD WINAPI RecvMsg(const SOCKET* clientSocket)
{
	while (1)
	{
		char recvStr[100] = {};
		int recvRet = recv(*clientSocket, recvStr, sizeof(recvStr), 0);
		if (recvRet != -1)
			printf("服务器说：%s\n", recvStr);
		else
		{
			printf("服务器已断开\n");
			closesocket(*clientSocket);
			WSACleanup();
			system("pause");
			closesocket(*clientSocket);
			WSACleanup();
			exit(0);
		}
	}
	return 0;
}

int main()
{

	WSADATA wsaData = { 0 };
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);
	//******bind自定义端口号测试*********/
	SOCKADDR_IN clientSockAddr_in = { 0 };
	clientSockAddr_in.sin_family = AF_INET;
	clientSockAddr_in.sin_addr.S_un.S_addr = INADDR_ANY;	//本机IP
	clientSockAddr_in.sin_port = htons(2222);
	if(bind(clientSocket, (SOCKADDR*)&clientSockAddr_in, sizeof(clientSockAddr_in)) == SOCKET_ERROR)
	{
		std::cout << "绑定套接字失败\n";
		closesocket(clientSocket);
		WSACleanup();
		system("pause");
		return 0;
	}
	/***************************************/

	SOCKADDR_IN sockaddr_in;
	sockaddr_in.sin_family = AF_INET;
	sockaddr_in.sin_addr.S_un.S_addr =  inet_addr("172.16.20.203");		//inet_addr("192.168.18.173");		//服务端ip地址
	//sockaddr_in.sin_addr.S_un.S_addr = inet_addr("192.168.74.128");
	sockaddr_in.sin_port = htons(8888);														//服务端监听的端口
	int conRet = connect(clientSocket,(SOCKADDR*)&sockaddr_in, sizeof(sockaddr_in));
	if (conRet != SOCKET_ERROR)
	{
		printf("连接成功\n");
		CreateThread(0, 0, (LPTHREAD_START_ROUTINE)RecvMsg, &clientSocket, 0, 0);
	}
		
	else
	{
		printf("连接失败,返回%d\n", conRet);
		closesocket(clientSocket);
		WSACleanup();
	}
		
	while (1)
	{
		printf("输入内容\n");
		char sendStr[10000] = {};
		//scanf("%s", sendStr);	//遇到空格会截断后面内容
		gets_s(sendStr, sizeof(sendStr));

		int ret = send(clientSocket, sendStr, strlen(sendStr), 0);
		if (ret != 0)
			printf("客户端发送数据%dbyte\n", ret);
	}
}