C++中socket编程

原文:http://blog.****.net/cuiran/article/details/5854794

Server端

 #include <WINSOCK2.H>
 #include <stdio.h>
 #pragma comment(lib,"ws2_32.lib")
 void main()
 {
  //创建套接字
  WORD myVersionRequest;
  WSADATA wsaData;
  myVersionRequest=MAKEWORD(,);
  int err;
  err=WSAStartup(myVersionRequest,&wsaData);
  if (!err)
  {
   printf("已打开套接字/n");

  }
  else
  {
   //进一步绑定套接字
   printf("嵌套字未打开!");
   return;
  }
  SOCKET serSocket=socket(AF_INET,SOCK_STREAM,);//创建了可识别套接字
  //需要绑定的参数
  SOCKADDR_IN addr;
  addr.sin_family=AF_INET;
  addr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);//ip地址
  addr.sin_port=htons();//绑定端口

  bind(serSocket,(SOCKADDR*)&addr,sizeof(SOCKADDR));//绑定完成
  listen(serSocket,);//其中第二个参数代表能够接收的最多的连接数

  //////////////////////////////////////////////////////////////////////////
  //开始进行监听
  //////////////////////////////////////////////////////////////////////////
  SOCKADDR_IN clientsocket;
  int len=sizeof(SOCKADDR);
  while ()
  {
   SOCKET serConn=accept(serSocket,(SOCKADDR*)&clientsocket,&len);//如果这里不是accept而是conection的话。。就会不断的监听
   char sendBuf[];

   sprintf(sendBuf,"welcome %s to bejing",inet_ntoa(clientsocket.sin_addr));//找对对应的IP并且将这行字打印到那里
   send(serConn,sendBuf,strlen(sendBuf)+,);
   char receiveBuf[];//接收
   recv(serConn,receiveBuf,strlen(receiveBuf)+,);
   printf("%s/n",receiveBuf);
   closesocket(serConn);//关闭
  WSACleanup();//释放资源的操作
  }
 }

Client端

 #include <WINSOCK2.H>
 #include <stdio.h>
 #pragma comment(lib,"ws2_32.lib")

 void main()
 {
  int err;
  WORD versionRequired;
  WSADATA wsaData;
  versionRequired=MAKEWORD(,);
  err=WSAStartup(versionRequired,&wsaData);//协议库的版本信息

  if (!err)
  {
   printf("客户端嵌套字已经打开!/n");
  }
  else
  {
   printf("客户端的嵌套字打开失败!/n");
   return;//结束
  }
  SOCKET clientSocket=socket(AF_INET,SOCK_STREAM,);
  SOCKADDR_IN clientsock_in;
  clientsock_in.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
  clientsock_in.sin_family=AF_INET;
  clientsock_in.sin_port=htons();
  //bind(clientSocket,(SOCKADDR*)&clientsock_in,strlen(SOCKADDR));//注意第三个参数
  //listen(clientSocket,5);
  connect(clientSocket,(SOCKADDR*)&clientsock_in,sizeof(SOCKADDR));//开始连接

  char receiveBuf[];
  recv(clientSocket,receiveBuf,,);
  printf("%s/n",receiveBuf);

  send(clientSocket,"hello,this is client",strlen("hello,this is client")+,);
  closesocket(clientSocket);
  WSACleanup();
 }