tcp服务端与客户端

//客户端：

#include <iostream>
#include <stdio.h>
#include <windows.h>

using namespace std;

#pragma comment(lib, "WS2_32.lib")

int main()
{
 WSADATA wsaData;
 WORD sockVersion = MAKEWORD(2, 2);
 SOCKET sock = 0;

 if (WSAStartup(sockVersion, &wsaData) != 0)
 {
  cout << "initlization failed!" << endl;
  exit(0);
 }

 sock = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

 if (sock == INVALID_SOCKET)
 {
  cout << "failed socket!" << endl;

  return 0;
 }

 sockaddr_in sin;

 sin.sin_family = AF_INET; 
 sin.sin_port = htons(4567);
 sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

 if (connect(sock, (sockaddr*)&sin, sizeof(sockaddr)) == -1)
 {
  cout << "connect failed!" << endl;

  return 0;
 }

 char buffer[256] = "/0";
 int  nRecv = 0;

 nRecv = recv(sock, buffer, 256, 0);

 if (nRecv > 0)
 {
  buffer[nRecv] = '/0';

  cout << "reveive data: " << buffer << endl;
 }

 closesocket(sock);
 
 WSACleanup();
}

//服务端：

#include <iostream>
#include <stdio.h>
#include <windows.h>

using namespace std;

#pragma comment(lib, "WS2_32.lib")

int main()
{
 WSADATA wsaData;
 WORD sockVersion = MAKEWORD(2, 2);
 SOCKET sListen = 0;
 sockaddr_in sin  = {0};
 sockaddr_in remoteAddr = {0};
 char szText[] = "TCP Server Demo";
 int nAddrLen = 0;

 nAddrLen = sizeof(sockaddr_in);
        //fill sin
 sin.sin_port = htons(4567);
 sin.sin_family = AF_INET;
 sin.sin_addr.S_un.S_addr = INADDR_ANY;

 //init wsa
 if (WSAStartup(sockVersion, &wsaData) != 0)
 {
  cout << "initlization failed!" << endl;

  exit(0);
 }

 sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

 if (bind(sListen, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
 {
  cout << "bind failed!" << endl;

  return 0;
 }

 if (listen(sListen, 2) == SOCKET_ERROR)
 {
  cout << "listen failed!" << endl;

  return 0;
 }

 SOCKET sClient = INADDR_ANY;

 while (true)
 {
  sClient = accept(sListen, (SOCKADDR*)&remoteAddr, &nAddrLen);

  if (sClient == INVALID_SOCKET)
  {
   cout << "accept failed!" << endl;

   continue;
  }

  send(sClient, szText, strlen(szText), 0);

  closesocket(sClient); 

 }

 closesocket(sListen);

 WSACleanup();
}