[Winpcap-users] Readfile_ex

[Gianluca Varenni]

Why are you trying to use the argv variable?

That is a pointer to an array of (read-only) strings passed as arguments to the main of you app, hence it should NOT be used as an argument to fgets.

You should use your own char array, like

int main()
{
    char text[512];
    fgets(text, 512, stdin);
    ....
}

The reason why "*argv = "save"; " works is probably because you are assigning a constant string to *argv, so you are not overwriting memory (but this is just speculating over buggy code).

Have a nice day
GV
  ----- Original Message ----- 
  From: Benjamin Amaudric 
  To: winpcap-users at winpcap.org 
  Sent: Monday, May 15, 2006 1:24 AM
  Subject: [Winpcap-users] Readfile_ex


  Hi,

  I'm student and I'm starting use differents functions of WinPcap. 
  I've a problem when I try to open a pcap file like it's show in Readfile_ex.

  It is possible to choose which file we want to open? And the directory where the file is?

  I try to use this: but it doesnt't work!


  printf("Which file would you like to open?\n");
  fgets(reinterpret_cast<char *> (* argv), 100, stdin); 

   /* Open the capture file */
   if ((fp= pcap_open_offline(reinterpret_cast<const char *>(*argv),   
         errbuf     // error buffer
         )) == NULL)
   {
    fprintf(stderr,"\nUnable to open the file %s.\n", *argv);
    return -1;
   }


  However, if I do this, it works!!

  *argv ="save";

   /* Open the capture file */
   if ((fp= pcap_open_offline(reinterpret_cast<const char *>(*argv),   
         errbuf     // error buffer
         )) == NULL)
   {
    fprintf(stderr,"\nUnable to open the file %s.\n", *argv);
    return -1;
   }


  Maybe someone tried to do this already!!!

  Thanks you§


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