//服务端

#include <WinSock2.h>
#include <stdio.h>
#include <stdlib.h>

#pragma comment(lib, "ws2_32.lib")
//http://blog.csdn.net/shenjie12345678/article/details/28321969
//C++基于TCP/IP简单的客户端、服务器通信程序实例

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;
	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);

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

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

	SOCKADDR_IN addrClient;
	int len = sizeof(SOCKADDR);

	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;
		}

		printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr));

		//发送数据
		int iSend = send(sockConn, buf, sizeof(buf), 0);
		if (iSend == SOCKET_ERROR){
			printf("send failed");
			break;
		}

		char recvBuf[100];
		memset(recvBuf, 0, sizeof(recvBuf));
		// 		//接收数据
		recv(sockConn, recvBuf, sizeof(recvBuf), 0);
		printf("%s\n", recvBuf);

		closesocket(sockConn);
	}

	closesocket(sockSrv);
	WSACleanup();
	system("pause");
}

//客户端

#include <WinSock2.h>
#include <stdio.h>

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

void main()
{
	//加载套接字
	WSADATA wsaData;
	char buff[1024] ;
	memset(buff, 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, buff, sizeof(buff), 0);
		printf("%s\n", buff);
	}

	//发送数据
	char buff2[1024] = "hello, this is a Client....";
	send(sockClient, buff2, sizeof(buff2), 0);

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