TCP/IP客户服务端创建线程进行消息处理

VS2017
编译报警但无关紧要，仅供参考作用；
编译出错问题可能一：
属性—C/C++ —常规—SDL检查 点“否”即可；
头文件问题可将头文件加入#include "pch.h"中；
PS：依然还有问题，比如套接字没有关闭，死循环监视等，可以考虑加入事件，通过监听事件再建立新连接。
客户端没有添加线程，执行完后退出；
Client.cpp

#include <stdio.h>
#include <Winsock2.h>
#include "pch.h"
#pragma comment(lib, "ws2_32.lib")  
void main()
{
	//加载套接字  
	WSADATA wsaData;
	char buff[] = "hello, this is a Client....";
	char buff2[1024];
	memset(buff2, 0, sizeof(buff));

	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
	{
		printf("Failed to load Winsock");
		return;
	}

	SOCKADDR_IN addrSrv;
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(5099);
	addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	//创建套接字  
	SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
	if (SOCKET_ERROR == sockClient) {
		printf("Socket() error:%d", WSAGetLastError());
		return;
	}

	//向服务器发出连接请求  
	if (connect(sockClient, (struct  sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET) {
		printf("Connect failed:%d", WSAGetLastError());
		return;
	}
	else
	{
		//接收数据  
		recv(sockClient, buff2, sizeof(buff2), 0);
		/*对消息进行处理*/
		//小写转大写
		for (int i = 0; i < sizeof(buff2); i++)
		{
			if (buff2[i] >= 'a'&& buff2[i] <= 'z')
				buff2[i] -= 32;
		}
		printf("%s\n", buff2);
	}
	//发送数据  
	send(sockClient, buff, sizeof(buff), 0);

	//关闭套接字  
	closesocket(sockClient);
	WSACleanup();
}

服务端线程执行发送和接收线程，没有进行消息处理。
Server.cpp

#include <WinSock2.h>
#include <stdio.h>
#include <stdlib.h>
#include "pch.h"
#pragma comment(lib, "ws2_32.lib")
typedef struct myPara // 传参结构体
{
	SOCKET ClientSocket;
	sockaddr_in clntAddr;
}MyPara;

DWORD WINAPI MyThread(const LPVOID param)
{
	MyPara *tmp = (MyPara*)param;

	/*发送数据*/	
	char buf[] = "Server: hello, I am a server.....";
	send(tmp->ClientSocket, buf, sizeof(buf), 0);
	
	/*接收数据*/
	char recvBuff[128] = { 0 };
	memset(recvBuff, 0, sizeof(recvBuff));	//清空/初始化
	recv(tmp->ClientSocket, recvBuff, sizeof(recvBuff), NULL);//接受客户端套接字的消息
	printf("%s\n", recvBuff);				//打印出来
	return 0;
}

void main()
{
	WSADATA wsaData;
	int port = 5099;
	char buf[] = "Server: hello, I am a server.....";
	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
	{
		printf("Failed to load Winsock");
		return;
	}

	//创建用于监听的套接字
	SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);

	SOCKADDR_IN addrSrv;
	memset(&addrSrv, 0, sizeof(addrSrv));
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(port); //1024以上的端口号
//	addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//监听本机所有的IP地址，默认本机网卡的IP地址
	addrSrv.sin_addr.s_addr = inet_addr("127.0.0.1");//绑定本机的本地环回地址

	int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN));//开始绑定
	if (retVal == SOCKET_ERROR) {
		printf("Failed bind:%d\n", WSAGetLastError());
		return;
	}

	if (listen(sockSrv, 10) == SOCKET_ERROR) {							//开始监听
		printf("Listen failed:%d", WSAGetLastError());
		return;
	}

	SOCKADDR_IN addrClient;
	int len = sizeof(SOCKADDR);

	HANDLE hThread;
	while (1)
	{
		//等待客户请求到来	
		SOCKET sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len);
		if (sockConn == SOCKET_ERROR) {
			printf("Accept failed:%d", WSAGetLastError());
			break;
		}
		//打印地址
		printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr));

		MyPara *tmp = new MyPara;
		tmp->ClientSocket = sockConn;
		tmp->clntAddr = addrClient;
		
		/*创建线程*/	
		hThread = CreateThread(NULL, 0, &MyThread, tmp, 0, NULL);
	
		//closesocket(sockConn);//关闭新套接字
	}
	
	closesocket(sockSrv);
	WSACleanup();
	system("pause");    
}