unix网络编程 chapter5传输数字并返回和

server:

#include"WinSock2.h"
#include "time.h"
#include "stdio.h"

#include <string>
#include <iostream>

#pragma comment(lib,"WS2_32")

using namespace std;

const int MaxLine = 1024;
char lBuf[MaxLine];
short gPort = 9877;

int main()
{
	int lRet = 0;
	WSADATA lWsaData;
	if ((lRet = WSAStartup(MAKEWORD(2,2), &lWsaData)) != 0)
	{
		cout << "Error " << lRet << endl;
		return 0;
	}

	int lListen = 0, lConnfd = 0;
	SOCKADDR_IN lServAddr;

	lServAddr.sin_family = AF_INET;
	lServAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	lServAddr.sin_port = htons(gPort);

	SOCKET lSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == lSocket)
	{
		cout << "INVALID_SOCKET" << endl;
		return 0;
	}
	bind(lSocket,(sockaddr*)(&lServAddr),sizeof(lServAddr));
	listen(lSocket,5);

	while(true)
	{
		SOCKADDR_IN lClientAddr;
		int lLen = sizeof(lClientAddr);

		SOCKET lAcceptedSocket = accept(lSocket,(sockaddr*)&lClientAddr,&lLen);
		printf("Connection from %s, port %d\n",inet_ntoa(lClientAddr.sin_addr),ntohs(lClientAddr.sin_port));

		int lReadSize = 0;
		int lSize = strlen(lBuf);

		while((lReadSize = recv(lAcceptedSocket,lBuf,MaxLine,0)) > 0)
		{
			string lRecvStr(lBuf,lReadSize);
			long lNum1 = 0, lNum2 = 0;
			if (sscanf(lRecvStr.c_str(), "%ld%ld", &lNum1, &lNum2) == 2)
			{
				sprintf(lBuf,"%ld\n", lNum1+lNum2);
			}
			else
				sprintf(lBuf,"Input Error\n");

			if ("close" == lRecvStr)
			{
				closesocket(lAcceptedSocket);
				return 0;
			}
			send(lAcceptedSocket,lBuf,strlen(lBuf),0);
		}
		closesocket(lAcceptedSocket);
	}
}

　　client:

#include<WinSock2.h>

#include <iostream>
#include <string>

using namespace std;

#pragma comment(lib, "WS2_32")

short gPort = 9877;
const int MaxLine = 1024;


void StrClient(SOCKET &aSockfd)
{
	string lStr;
	while (getline(cin, lStr) != NULL)
	{
		send(aSockfd,lStr.c_str(),lStr.size(),0);

		char lSendline[MaxLine];
		int lReadSize = 0;
		if ( (lReadSize = recv(aSockfd,lSendline,MaxLine,0) ) == 0 )
		{
			cerr << "sever terminated prematurely\n";
			return ;
		}
		string lRecvStr(lSendline,lReadSize);
		cout << lRecvStr << endl;
	}
}
int main()
{
	int lRet = 0;
	WSADATA lWsaData;
	if ((lRet = WSAStartup(MAKEWORD(2,2), &lWsaData)) != 0)
	{
		cout << "Error " << lRet << endl;
		return 0;
	}
	SOCKADDR_IN lAddr;
	lAddr.sin_family = AF_INET;
	lAddr.sin_port = htons(gPort);

	int lNum = 0;
	int lReadTime = 0;

	SOCKET lSocket = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == lSocket)
	{
		cout << "INVALID_SOCKET" << endl;
		return 0;
	}

	lAddr.sin_addr.s_addr = inet_addr("192.168.1.102");
	if (connect(lSocket,(sockaddr*)(&lAddr),sizeof(lAddr)) < 0 )
	{
		cout << "connect error" << endl;
		return 0;
	}
	StrClient(lSocket);

	return 0;
}