TCP通信

#include <stdio.h>
#include <WinSock2.h>
 
#pragma comment(lib,"ws2_32.lib")
 
int main()
{
	SOCKET soc;
	SOCKADDR_IN serverAddr;
	SOCKADDR_IN clientAddr;
 
	unsigned char buf[1024];
 
	WSADATA wsa;
	WSAStartup(MAKEWORD(1,1),&wsa);
 
	if ((soc = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)) <= 0)
	{
	    printf("create socket fail!\n");
	    return -1;
	}
 
	serverAddr.sin_family = AF_INET;
	serverAddr.sin_port = htons(4999);
	serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
 
	if (connect(soc,(SOCKADDR *)&serverAddr,sizeof(serverAddr)) != 0)
	{
	    printf("connect fail!\n");
	    return -1;
	}
 
	while(1)
	{
	    scanf("%s",buf);
	    if (send(soc,(const char *)buf,strlen((const char *)buf)+1,0) <= 0)
	    {
	        printf("Error!\n");
	    }
	}
 
	getchar();
	return 0;
}

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

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

#include <iostream>
using namespace std;

int main()
{
const int BUF_SIZE = 64;

WSADATA wsd; //WSADATA变量
SOCKET sServer; //服务器套接字
SOCKET sClient; //客户端套接字
SOCKADDR_IN addrServ;; //服务器地址
char buf[BUF_SIZE]; //接收数据缓冲区
char sendBuf[BUF_SIZE];//返回给客户端得数据
int retVal; //返回值

//初始化套结字动态库
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
cout << "WSAStartup failed!" << endl;
return 1;
}
//创建套接字
sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(INVALID_SOCKET == sServer)
{
cout << "socket failed!" << endl;
WSACleanup();//释放套接字资源;
return  -1;
}
//服务器套接字地址 
addrServ.sin_family = AF_INET;
addrServ.sin_port = htons(4999);
addrServ.sin_addr.s_addr = INADDR_ANY;
//绑定套接字
retVal = bind(sServer, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN));

if(SOCKET_ERROR == retVal)
{
cout << "bind failed!" << endl;
closesocket(sServer); //关闭套接字
WSACleanup(); //释放套接字资源;
return -1;
}
//开始监听 
retVal = listen(sServer, 1);
if(SOCKET_ERROR == retVal)
{
cout << "listen failed!" << endl;
closesocket(sServer); //关闭套接字
WSACleanup(); //释放套接字资源;
return -1;
}
//接受客户端请求
sockaddr_in addrClient;
int addrClientlen = sizeof(addrClient);
sClient = accept(sServer,(sockaddr FAR*)&addrClient, &addrClientlen);
if(INVALID_SOCKET == sClient)
{
cout << "accept failed!" << endl;
closesocket(sServer); //关闭套接字
WSACleanup(); //释放套接字资源;
return -1;
}

while(true){
//接收客户端数据
ZeroMemory(buf, BUF_SIZE);
retVal = recv(sClient, buf, BUF_SIZE, 0);
if (SOCKET_ERROR == retVal)
{
cout << "recv failed!" << endl;
closesocket(sServer); //关闭套接字
closesocket(sClient); //关闭套接字
WSACleanup(); //释放套接字资源;
return -1;
}
if(buf[0] == ‘0‘)
break;
cout << "客户端发送的数据: " << buf <<endl;
cout << "向客户端发送数据: " ;
cin >> sendBuf;
send(sClient, sendBuf, strlen(sendBuf), 0);
}
//退出
closesocket(sServer); //关闭套接字
closesocket(sClient); //关闭套接字
WSACleanup(); //释放套接字资源;

return 0;
}