=======recvfrom:ip=192.168.1.2:1878,size=-1,count=2,sizeof=4,buflen=1472=======

=======recvfrom:ip=192.168.1.2:1878,size=99,count=3,sizeof=4,buflen=1472=======


=======recvfrom:ip=192.168.1.2:1878,size=-1,count=4,sizeof=4,buflen=1472=======


=======recvfrom:ip=192.168.1.2:1878,size=16,count=5,sizeof=4,buflen=1472=======


=======recvfrom:ip=192.168.1.2:1878,size=-1,count=6,sizeof=4,buflen=1472=======


=======recvfrom:ip=192.168.1.2:1878,size=12,count=7,sizeof=4,buflen=1472=======


=======recvfrom:ip=192.168.1.2:1878,size=-1,count=8,sizeof=4,buflen=1472=======


=======recvfrom:ip=192.168.1.2:1878,size=41,count=9,sizeof=4,buflen=1472=======
 
=======recvfrom:ip=192.168.1.2:1878,size=-1,count=10,sizeof=4,buflen=1472=======
 
=======recvfrom:ip=192.168.1.2:1878,size=12,count=11,sizeof=4,buflen=1472=======
 
=======recvfrom:ip=192.168.1.2:1878,size=-1,count=12,sizeof=4,buflen=1472=======
 
=======recvfrom:ip=192.168.1.2:1878,size=40,count=13,sizeof=4,buflen=1472=======
0
=======recvfrom:ip=192.168.1.2:1878,size=-1,count=14,sizeof=4,buflen=1472=======
0
=======recvfrom:ip=192.168.1.2:1878,size=12,count=15,sizeof=4,buflen=1472=======
0

size是recvfrom返回的值
sizeof是sizeof(buf);

sizeof(buf)=sizeof(char*)=4

int myrecvfrom(S,buf,len,flags,from,fromlen)
{
   //do somthing ...  
  //我想在这里得到buf的ascii就像抓包软件里那样的数据写入到文件里怎么做？
   return recvefrom(S,buf,len,flags,from,fromlen);
}