IP

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获取本机IP

//#include<winsock2.h>
//连接 ws2_32.lib
void CCWebClientDlg::InitSocket()
{
 WORD  wVersionRequested;  
 WSADATA  wsaData;  
 char  name[255];  
 CString  ip; 
 int err;

 PHOSTENT  hostinfo;  
 wVersionRequested  =  MAKEWORD( 1, 1 );//版本号1.1

 

 //1.加载套接字库 
 err = WSAStartup( wVersionRequested, &wsaData );
 if ( err != 0 ) {

  return;
 }

 //判断是否我们请求的winsocket版本，如果不是
 //则调用WSACleanup终止winsocket的使用并返回            

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

   WSACleanup( );
   return; 
  }///...if

 if  ( err  ==  0  )  
 {  
  
  if(  gethostname  (  name,  sizeof(name))  ==  0)  
  {  
   if((hostinfo  =  gethostbyname(name))  !=  NULL)  
   {  
    ip  =  inet_ntoa  (*(struct  in_addr  *)*hostinfo->h_addr_list);  
   }  
  }  
  
  WSACleanup(  );  
 }    
 SetDlgItemText(IDC_EDIT_PORT,name);//name里是本机名  
 SetDlgItemText(IDC_IPADDRESS1,ip);  //ip中是本机IP  

获取局域网IP

Receiver.c源代码源代码

 

#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#define MCASTADDR "233.0.0.1" //本例解决多播组地址
#define MCASTPORT 5150 //绑定本地端口号
#define BUFSIZE 1024 //接收数据缓冲大小
int main( int argcchar ** argv)
{
　WSADATA wsd;
　struct sockaddr_in localremotefrom;
　SOCKET socksockM;
　TCHAR recvbuf[BUFSIZE];
　/*struct ip_mreq mcast; // Winsock1.0 */
　int len = sizeof( struct sockaddr_in);
　int ret;
　//初始化WinSock2.2
　if( WSAStartup( MAKEWORD(22)&wsd) != 0 )
　{
printf("WSAStartup() failed\n");
return -1;
　}
　/*
　创建一个SOCK_DGRAM类型SOCKET
　其中WSA_FLAG_MULTIPOINT_C_LEAF表示IP多播控制面层上属于"无根"类型;
　WSA_FLAG_MULTIPOINT_D_LEAF表示IP多播数据面层上属于"无根"关控制面层和
　数据面层关概念请参阅MSDN说明
　*/
　if((sock=WSASocket(AF_INETSOCK_DGRAM0NULL0
WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF|
WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
　{
printf("socket failed with:%d\n"WSAGetLastError());
WSACleanup();
return -1;
　}
　//将sock绑定到本机某端口上
　local.sin_family = AF_INET;
　local.sin_port = htons(MCASTPORT);
　local.sin_addr.s_addr = INADDR_ANY;
　if( bind(sock(struct sockaddr*)&localsizeof(local)) == SOCKET_ERROR )
　{
printf( "bind failed with:%d \n"WSAGetLastError());
closesocket(sock);
WSACleanup();
return -1;
　}
　//加入多播组
　remote.sin_family = AF_INET;
　remote.sin_port = htons(MCASTPORT);
　remote.sin_addr.s_addr = inet_addr( MCASTADDR );
　/* Winsock1.0 */
　/*
　mcast.imr_multiaddr.s_addr = inet_addr(MCASTADDR);
　mcast.imr_interface.s_addr = INADDR_ANY;
　if( setsockopt(sockMIPPROTO_IPIP_ADD_MEMBERSHIP(char*)&mcast
sizeof(mcast)) == SOCKET_ERROR)
　{
printf("setsockopt(IP_ADD_MEMBERSHIP) failed:%d\n"WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
　}
　*/
　/* Winsock2.0*/
　if(( sockM = WSAJoinLeaf(sock(SOCKADDR*)&remotesizeof(remote)
NULLNULLNULLNULL
JL_BOTH)) == INVALID_SOCKET)
　{
printf("WSAJoinLeaf() failed:%d\n"WSAGetLastError());
closesocket(sock);
WSACleanup();
return -1;
　}
　//接收多播数据当接收到数据为"QUIT"时退出
　while(1)
　{
if(( ret = recvfrom(sockrecvbufBUFSIZE0
(struct sockaddr*)&from&len)) == SOCKET_ERROR)
{
　printf("recvfrom failed with:%d\n"WSAGetLastError());
　closesocket(sockM);
　closesocket(sock);
　WSACleanup();
　return -1;
}
if( strcmp(recvbuf"QUIT") == 0 ) break;
else {
　recvbuf[ret] = '\0';
　printf("RECV:' %s ' FROM <%s> \n"recvbufinet_ntoa(from.sin_addr));
}
　}
　closesocket(sockM);
　closesocket(sock);
　WSACleanup();
　return 0;
}

    Sender.c源代码源代码

 

#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#define MCASTADDR "233.0.0.1" //本例解决多播组地址
#define MCASTPORT 5150 //本地端口号
#define BUFSIZE 1024 //发送数据缓冲大小
int main( int argcchar ** argv)
{
　WSADATA wsd;
　struct sockaddr_in remote;
　SOCKET socksockM;
　TCHAR sendbuf[BUFSIZE];
　int len = sizeof( struct sockaddr_in);
　//初始化WinSock2.2
　if( WSAStartup( MAKEWORD(22)&wsd) != 0 )
　{
printf("WSAStartup() failed\n");
return -1;
　}
　if((sock=WSASocket(AF_INETSOCK_DGRAM0NULL0
WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF|
WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
　{
printf("socket failed with:%d\n"WSAGetLastError());
WSACleanup();
return -1;
　}
　//加入多播组
　remote.sin_family = AF_INET;
　remote.sin_port = htons(MCASTPORT);
　remote.sin_addr.s_addr = inet_addr( MCASTADDR );
　if(( sockM = WSAJoinLeaf(sock(SOCKADDR*)&remote
sizeof(remote)NULLNULLNULLNULL
JL_BOTH)) == INVALID_SOCKET)
　{
printf("WSAJoinLeaf() failed:%d\n"WSAGetLastError());
closesocket(sock);
WSACleanup();
return -1;
　}
　//发送多播数据当用户控制台输入"QUIT"时退出
　while(1)
　{
printf("SEND : ");
scanf("%s"sendbuf);
if( sendto(sockM(char*)sendbufstrlen(sendbuf)0(struct sockaddr*)
&remotesizeof(remote))==SOCKET_ERROR)
{
　printf("sendto failed with: %d\n"WSAGetLastError());
　closesocket(sockM);
　closesocket(sock);
　WSACleanup();
　return -1;
}
if(strcmp(sendbuf"QUIT")==0) break;
Sleep(500);
　}
　closesocket(sockM);
　closesocket(sock);
　WSACleanup();
　return 0;
}

   

    本实例对IP多播通信进行了探讨实例源代码由Sender和Receiver两部分组成Sender用户从控制台上输入多播发送数据Receiver端都要求加入同一个多播组完成接收Sender发送多播数据

来源：python脚本自动迁移