#include <stdio.h> #include <iostream> #include <winsock2.h> #pragma comment(lib, "ws2_32.lib") using namespace std; int main() {  // 初始化 Winsock.  WSADATA wsaData;  int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );  if ( iResult != NO_ERROR )  {   cout<<"failed to initialize!"<<endl;   return 0;  }  // 建立socket socket.  SOCKET client;  client = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );  if ( client == INVALID_SOCKET )  {   cout<<"failed to create client socket!"<<endl;   WSACleanup();   return 0;  }  // 连接到服务器.  sockaddr_in clientService;  clientService.sin_family = AF_INET;  clientService.sin_addr.s_addr = inet_addr( "127.0.0.1" );  clientService.sin_port = htons( 13579 );  if ( connect( client, (SOCKADDR*) &clientService, sizeof(clientService) ) == SOCKET_ERROR)  {   cout<<"Failed to connect"<<endl;   closesocket(client);   WSACleanup();   return 0;  }  // 发送数据.  int bytesSent;  char sendbuf[4096] = "Client: Sending data.";  while(TRUE)  {   bytesSent = send( client, sendbuf, strlen(sendbuf), 0 );   gets_s(sendbuf, 4096);  }  closesocket(client);  WSACleanup();  return 0; }

#include <iostream> #include <WinSock2.h> #pragma comment(lib, "ws2_32.lib") using namespace std; int main() {  WSADATA wsaData;  int iInit = WSAStartup(MAKEWORD(2, 2), &wsaData);  if (iInit != NO_ERROR)  {   cout<<"failed to initialize!"<<endl;   return 0;  }  SOCKET server = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP);  if (server == INVALID_SOCKET)  {   cout<<"failed to create server socket!"<<endl;   WSACleanup();   return 0;  }  sockaddr_in bindinfo;  bindinfo.sin_family = AF_INET;  bindinfo.sin_addr.s_addr =  inet_addr( "127.0.0.1" );  bindinfo.sin_port = htons(13579);  if ( bind( server, (SOCKADDR*) &bindinfo, sizeof(bindinfo) ) == SOCKET_ERROR )  {   cout<<"failed to bind!"<<endl;   closesocket(server);   WSACleanup();   return 0;  }  //listen  if (listen(server, 1) == SOCKET_ERROR) {   cout<<"listen failed"<<endl;   closesocket(server);   WSACleanup();   return 0;  }  //accept and block  SOCKET socketWork = accept(server, NULL, NULL);  if (socketWork == INVALID_SOCKET) {   wprintf(L"accept failed with error: %ld\n", WSAGetLastError());   closesocket(server);   WSACleanup();   return 0;  }  int byteRecv = SOCKET_ERROR;  char recvBuf[4096] = "";  while(TRUE)  {   byteRecv = recv(socketWork, recvBuf, 4096, 0);   if (byteRecv == 0)   {    break;   }   recvBuf[byteRecv] = 0;   cout<<recvBuf<<endl;  }  closesocket(server);  WSACleanup();  return 0; }