winSocket 2 简单的可持续的socket

#define WIN32_LEAN_AND_MEAN
#define  _WINSOCK_DEPRECATED_NO_WARNINGS 
#include<iostream>
#include<stdio.h>
#include<Windows.h>
#include<WinSock2.h>
//#pragma comment(lib,"ws2_32.lib")// win 写法 + 动态库 


using namespace std;
int main()
{
	WORD ver = MAKEWORD(2, 2);
	WSADATA data;
	WSAStartup(ver, &data);
	//socket 网络通信  代码

	//1.建立socket
	SOCKET _cSock = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == _cSock) {
		printf("qaaabuild socket failed
");
	}
	else {
		printf("套接字建立成功
");
	}
	//2.连接服务器 connect
	sockaddr_in _sin = {};
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
	_sin.sin_addr.S_un.S_addr = inet_addr("192.168.0.100");
	int ret= connect(_cSock, (sockaddr*)&(_sin), sizeof(_sin));
	if (SOCKET_ERROR == ret) {
		printf("服务器连接成功失败
");
	}
	else {
		printf("服务器连接成功
");
	}
	//2.1 
	
	while (true) {
		//2.1 输入请求命令
		char cmdBuf[128] = {};
		scanf("%s", cmdBuf);
		//2.2处理请求
		if (0 == strcmp(cmdBuf, "exit")) {
			break;
		}
		else {
			//2.3向服务器发送请求
			send(_cSock, cmdBuf, strlen(cmdBuf)+1, 0);
		}
		//3.recv接收服务器信息 
		char recvbuf[256] = {};
		int nlen = recv(_cSock, recvbuf, 256, 0);
		if (nlen > 0) {
			printf("接收到%d字节:	%s", nlen, recvbuf);
		}

	}





	//3.recv接收服务器信息 
	char recvbuf[256] = {};
	int nlen=	recv(_cSock, recvbuf, 256, 0);
	if (nlen > 0) {
		printf("%d:	%s", nlen ,recvbuf);
	}
	//4. closesocket
	closesocket(_cSock);
	WSACleanup();
	getchar();
	return 0;

}

　　

#define WIN32_LEAN_AND_MEAN
#define  _WINSOCK_DEPRECATED_NO_WARNINGS 


#include<iostream>
#include<stdio.h>
#include<Windows.h>
#include<WinSock2.h>
//#pragma comment(lib,"ws2_32.lib")// win 写法 + 动态库 


using namespace std;
int main()
{
	WORD ver = MAKEWORD(2, 2);
	WSADATA data;
	WSAStartup(ver, &data);
	//socket 网络通信  代码

	//tcp 服务端
	//1. 建立一个socket
	SOCKET _sock= socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	//2.绑定用于客户端接收的网路端口
	sockaddr_in _sin = {};
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
	_sin.sin_addr.S_un.S_addr = htonl(INADDR_ANY);// inet_addr("127.0.0.1");//服务器 要绑定的ip地址

	if (SOCKET_ERROR == bind(_sock, (sockaddr*)&_sin, sizeof(_sin))) {
		printf("bind error
");
	}
	else {
		printf("bind successful
");
	}
	//3.监听端口
	if (SOCKET_ERROR == listen(_sock, 5)) {
		printf("listen error
");
	}
	else {
		printf("listen successful
");
	}
	//4。accept 等待接收客户连接
	sockaddr_in _clientAddr = {};
	SOCKET _cSock ;
	char msgbuf[] = "hello world";
	//int _cSock_Strlen = strlen(msgbuf) + 1;
	int len = sizeof(_clientAddr);
	//_cSock = accept(_sock, (sockaddr*)&_clientAddr, (int*)sizeof(_clientAddr)); //会返回客户端地址
	_cSock = accept(_sock, (sockaddr*)&_clientAddr, &len); //会返回客户端地址
	if (INVALID_SOCKET == _cSock) {
		printf("连接可客户端失败");
	}
	printf("new client:IP=%s
", inet_ntoa(_clientAddr.sin_addr));
	char _recv_cmdbuf[128] = {};

	while (true)
	{
		//持续处理请求的c/s
		//4.1 
		int rLen = recv(_cSock, _recv_cmdbuf, 128, 0);
		if (rLen <= 0) {
			printf("client exited()");
			break;
		}
		printf("收到命令%s 
", _recv_cmdbuf);
		//4.2
		//处理请求
		if (0 == strcmp(_recv_cmdbuf, "getName")) {
			char msgbuf[] = "狗娃 
";
			send(_cSock, msgbuf, strlen(msgbuf) + 1, 0);
		}
		else if (0 == strcmp(_recv_cmdbuf, "getAge")) {
			char msgbuf[] = "狗娃 18
";
			send(_cSock, msgbuf, strlen(msgbuf) + 1, 0);
		}
		else {
			char msgbuf[] = "？？？？";
			send(_cSock, msgbuf, strlen(msgbuf) + 1, 0);
		}

		
		//5。send 发送一条数据
		send(_cSock, msgbuf, strlen(msgbuf) + 1, 0);
	}
	//6. 关闭socket
		closesocket(_sock);
	WSACleanup();
	getchar();
	return 0;
}