c++ - End of file on pipe magic during open -

i have c++ application in starting process(wireshark) following.

   if (fp == null){     fp = popen(processpath, "r"); //processpath process want start     if (!fp){         throw std::invalid_argument("cannot start process");             }     fprintf(fp, d_msg);//d_msg input want provide process  } else if(fp != null){     fprintf(fp, d_msg); } 

the problem when execute c++ application, start wireshark error end of file on pipe magic during open

what should avoid that?

also tried using mkfifo create named pipe , execute it. used this:

   if (fp == null){     system("mkfifo /tmp/mine.pcap");     fp = popen("wireshark -k -i /tmp/mine.pcap", "r");     if (!fp){         dout << "cannot start wireshark"<<std::endl;         throw std::invalid_argument("cannot start wireshark");           }     input = fopen("/tmp/mine.pcap", "wb");     fprintf(input , d_msg);     fclose(input); } else if(fp != null){     input = fopen("/tmp/mine.pcap", "wb");     fprintf(input , d_msg);     fclose(input); } 

but didn't work. following error:

the file "/tmp/wireshark_mine.pcap_20130730012654_ndbfzk" capture network type wireshark doesn't support

any appreciated.

thank much.

the problem when execute c++ application, start wireshark error end of file on pipe magic during open

what should avoid that?

you should write pcap file or pcap-ng file pipe, rather fprintfing something.

both of file formats binary. if you're constructing own packets, have construct , write pipe valid pcap file header or several valid pcap-ng blocks (section header block , @ least 1 interface description block) before can write packets, , then, each packet, have write per-packet pcap header or beginning and end of pcap-ng enhanced packet block before (and, enhanced block, after) raw packet data. if you're sending existing file wireshark, need read raw bytes file , send raw bytes down pipe.