//server代码
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <iostream>
#include <strings.h>
#include <arpa/inet.h>
       
//测试表明tcp服务器端只会收到1234
using namespace std;

int main()
{
  int confd,lisfd;
  struct sockaddr_in serv;
  bzero(&serv,0);
  char buf[12];
  bzero(buf,0);
  
  serv.sin_family=AF_INET;
  serv.sin_port=htons(8989 );
  serv.sin_addr.s_addr=htonl(INADDR_ANY);
  
  lisfd=socket(AF_INET,SOCK_DGRAM,0);
  bind(lisfd,(struct sockaddr *)&serv,sizeof(struct sockaddr_in));
  
    for(;;)
    {
       recvfrom(confd,buf,sizeof(buf),0,NULL,NULL);   
       cout<<buf<<endl;
    }
  
return 0;
}




//client.cpp 客户端代码
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <iostream>
#include <strings.h>
#include <arpa/inet.h>
       

using namespace std;

int main()
{
  int confd;
  struct sockaddr_in serv;
  bzero(&serv,0);
  char p1[]="1234";
  char p2[]="5678";
  
  serv.sin_family=AF_INET;
  serv.sin_port=htons(8989);
  inet_pton(AF_INET,"127.0.0.1",&serv.sin_addr.s_addr);
  
  confd=socket(AF_INET,SOCK_DGRAM,0);
 
  
  cout<<"send "<<sendto(confd,p1,sizeof(p1),0,(struct sockaddr *)&serv,sizeof(struct sockaddr_in))<<"bytes data!"<<endl;
  cout<<"send "<<sendto(confd,p2,sizeof(p2),0,(struct sockaddr *)&serv,sizeof(struct sockaddr_in))<<"bytes data!"<<endl;
  close(confd);
  

return 0;
}