TCP 的 网络应用程序的编写

/*1，计算机的名字 IP 表示

 2， 协议（语义+ 语法+ 规则）不同层 不同协议

 IOS 七层模型

7 ， 应用层 application

6 ， 表示层 Presentation

5  会话层  主机之间的通信 session

 4 传输层 transport

    3 网络层  network        找出最佳的传输线路

2 数据链路层 data link  介质访问

1 物理层 physical  二进制传输 在通信信道上如何传输比特流

 all people seem to need data process */

#include <Winsock2.h>

 #include <stdio.h>

void main() {

 WORD wVersionRequested;

 WSADATA wsaData;  int err;

    wVersionRequested = MAKEWORD( 1, 1 );  

  err = WSAStartup( wVersionRequested, &wsaData );

 if ( err != 0 )

 {

  /* Tell the user that we could not find a usable */   /* WinSock DLL.                                  */   return;  }    /*

Confirm that the WinSock DLL supports 2.2.*/  /* Note that if the DLL supports versions greater    */  /* than 2.2 in addition to 2.2, it will still return */  /* 2.2 in wVersion since that is the version we      */  /* requested.                                        */  

  if ( LOBYTE( wsaData.wVersion ) != 1 ||         HIBYTE( wsaData.wVersion ) != 1 )

 {   /* Tell the user that we could not find a usable */   /* WinSock DLL.                                  */   WSACleanup( );   return;  

}    /* The WinSock DLL is acceptable. Proceed. */

   SOCKET sockSrv = socket(AF_INET,SOCK_STREAM, 0 );  

SOCKADDR_IN addrSrv ;  

addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);// 主机字节序 转换成网络字节序

 addrSrv.sin_family = AF_INET;  

addrSrv.sin_port = htons(6000);

 bind(sockSrv,(SOCKADDR *)&addrSrv,sizeof(SOCKADDR));   

listen(sockSrv,5);  

  SOCKADDR_IN addrClient ;  

  int len = sizeof(SOCKADDR);   

 while(1)    {    

SOCKET sockConn = accept(sockSrv,(SOCKADDR*)&addrClient,&len);       

char sendBuf[100];    

 sprintf(sendBuf,"welcome %s to http://www.sunxin.org",      inet_ntoa(addrClient.sin_addr));

    send(sockConn,sendBuf,strlen(sendBuf)+1,0);    

 char recvBuf[100];    

 recv(sockConn, recvBuf,100,0);    

printf("%s /n", recvBuf);         

   closesocket (sockConn);   

 }

}

 

 

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#include <Winsock2.h> #include <stdio.h> /*1，计算机的名字 IP 表示 2， 协议（语义+ 语法+ 规则）不同层 不同协议 IOS 七层模型 7 ， 应用层 application 6 ， 表示层 Presentation 5  会话层  主机之间的通信 session 4 传输层 transport    3 网络层  network        找出最佳的传输线路 2 数据链路层 data link  介质访问 1 物理层 physical  二进制传输 在通信信道上如何传输比特流 all people seem to need data process */ #include <Winsock2.h> #include <stdio.h>

void main() { //加载套接字  WORD wVersionRequested;  WSADATA wsaData;  int err;    wVersionRequested = MAKEWORD( 1, 1 );    err = WSAStartup( wVersionRequested, &wsaData );  if ( err != 0 ) {   /* Tell the user that we could not find a usable */   /* WinSock DLL.                                  */   return;  }    /* Confirm that the WinSock DLL supports 2.2.*/  /* Note that if the DLL supports versions greater    */  /* than 2.2 in addition to 2.2, it will still return */  /* 2.2 in wVersion since that is the version we      */  /* requested.                                        */    if ( LOBYTE( wsaData.wVersion ) != 1 ||         HIBYTE( wsaData.wVersion ) != 1 ) {   /* Tell the user that we could not find a usable */   /* WinSock DLL.                                  */   WSACleanup( );   return;  }  SOCKET sockClient = socket(AF_INET,SOCK_STREAM,0);  SOCKADDR_IN addrSrv;  addrSrv.sin_family = AF_INET;  addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); // 点分十进制的字符串格式 转换成一个 ulong 类型

 addrSrv.sin_port = htons(6000);// 吧一个u-SHORT 类型的值从主机字节序顺序转换为tcp/ip 网络字节序

 connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

    char recvBuf[100];  recv(sockClient,recvBuf,100,0);  printf("%s/n",recvBuf);  send(sockClient,"this is lili", strlen("this is lili")+1, 0);  closesocket(sockClient);  WSACleanup();

}