TCP/IP c++

TCPclient.cpp

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

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

void main()
{
	//¼ÓÔØÌ×½Ó×Ö  
	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(5555);
	addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	//´´½¨Ì×½Ó×Ö  
	SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
	if (SOCKET_ERROR == sockClient) {
		printf("Socket() error:%d", WSAGetLastError());
		return;
	}

	//Ïò·þÎñÆ÷·¢³öÁ¬½ÓÇëÇó  
	if (connect(sockClient, (struct  sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET) {
		printf("Connect failed:%d", WSAGetLastError());
		return;
	}
	else
	{
		//½ÓÊÕÊý¾Ý  
		recv(sockClient, buff, sizeof(buff), 0);
		printf("%s\n", buff);
	}

	//·¢ËÍÊý¾Ý  
	strcpy(buff, "hello, this is a Client....");
	//char buff = "hello, this is a Client....";
	send(sockClient, buff, sizeof(buff), 0);

	//¹Ø±ÕÌ×½Ó×Ö  
	closesocket(sockClient);
	WSACleanup();
}

TCPserver.cpp

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

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

void main()
{
	WSADATA wsaData;
	int port = 5556;

	char buf[] = "Server: hello, I am a server.....";

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

	//´´½¨ÓÃÓÚ¼àÌýµÄÌ×½Ó×Ö  
	SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);

	SOCKADDR_IN addrSrv;
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(port); //1024ÒÔÉϵĶ˿ںŠ 
	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);

	//µÈ´ý¿Í»§ÇëÇóµ½À´    
	SOCKET sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len);
	if (sockConn == SOCKET_ERROR) {
		printf("Accept failed:%d", WSAGetLastError());
	}

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

	while (1)
	{

		char recvBuf[100];
		memset(recvBuf, 0, sizeof(recvBuf));
		//      //½ÓÊÕÊý¾Ý  
		int iResult = recv(sockConn, recvBuf, sizeof(recvBuf), 0);
		printf("%s\n", recvBuf);

		//·¢ËÍÊý¾Ý  
		int iSend = send(sockConn, buf, sizeof(buf), 0);
		if (iSend == SOCKET_ERROR) {
			/*printf("send failed");
			break;*/
			sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len);
			if (sockConn == SOCKET_ERROR) {
				printf("Accept failed:%d", WSAGetLastError());
			}

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



		//closesocket(sockConn);
	}

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