libpcap（winpcap）捕获数据包与存储和读取

使用libpcap（winpcap）捕获数据包与存储和读取
环境 libpcap + Qt Creator
#include <pcap.h>
int main ()
{
    char *err;
    char *dev;
    pcap_pkthdr *header;
    struct bpf_program guize;
    char guize_string[]="";
    u_char *packet;
    bpf_u_int32 netip;
    bpf_u_int32 netmask;
    dev=pcap_lookupdev(err);
    pcap_t *pcap_handle;
    pcap_lookupnet(dev,&netip,&netmask,err);
    pcap_handle=pcap_open_live(dev,BUFSIZ,1,200,err);
    pcap_compile(pcap_handle,&guize,guize_string,0,netip);
    pcap_setfilter(pcap_handle,&guize);

////////捕获数据包  并写入文件/////////////////////////////////
    pcap_dumper_t *p;
    p=pcap_dump_open(pcap_handle,"/home/yang/桌面/11/112");
      pcap_next_ex(pcap_handle,&header,(const u_char**)&packet);
      for(int k=0;k<header->len;k++)
          printf("%c",*(packet+k));
      printf("\n");
      pcap_dump((unsigned char*)p,header,packet); //写入
    pcap_dump_close(p);   //关闭