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System() Problem/Question

 
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System() Problem/Question, System("Ping") with user enters IP address
lockdown
6 Jan, 2008 - 06:11 PM
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So I am creating a application that allows the user to enter in a IP address and the program will ping it.

I will be using the System("ping") command but need to allow it to take a IP address the user enters. I was thinking of doing something like this but dont know how to formate it

CODE

    cout << "Enter IP address in xxx.xxx.xxx.xxx formate" <<endl;
    getline(cin,userString);
    system(userString.c_str(ping)); // Possible system(userString.c_str(), ping)


But I do not believe that work work. How would it be formated for that to work properly?
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Tom9729
RE: System() Problem/Question
6 Jan, 2008 - 06:27 PM
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In C you could do it like this (minus the user input, but you would just read that into the "ip_addy" string).

CODE

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>

int main()
{
  char* ping = "ping ";
  char* ip_addy = "127.0.0.1";
  char* s = malloc(strlen(ping) + strlen(ip_addy));
  
  strcat(s, ping);
  strcat(s, ip_addy);
  
  system(s);

  return 0;
}

There's probably a cleaner way in C++ though...
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lockdown
RE: System() Problem/Question
6 Jan, 2008 - 06:39 PM
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Thanks for the response. I have a limited knowledge of working with C but would like my program all C++ based even know your code would work. Dose anyone have the way to perform this in C++?
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Xing
RE: System() Problem/Question
6 Jan, 2008 - 06:40 PM
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Try this
system(("ping " + userString).c_str());
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lockdown
RE: System() Problem/Question
6 Jan, 2008 - 06:47 PM
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QUOTE(Xing @ 6 Jan, 2008 - 07:40 PM) *

Try this
system(("ping " + userString).c_str());


That worked perfectly. Thanks for all the help guys.
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VernonDozier
RE: System() Problem/Question
6 Jan, 2008 - 06:48 PM
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How 'bout this?



CODE

#include <string>
using namespace std;

int main ()
{
     string userString;
     cout << "Enter IP Address: ";
     cin >> userString;
     userString = "ping " + userString;

     // may have to include a library for c_str, can't remember.
     system (userString.c_str ());

     return 0;
}




I believe the above, if the user enters 127.0.0.1, is equivalent to:

CODE


system ("ping 127.0.0.1");



Is this what you are trying to do?





Looks like someone beat me to it!
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lockdown
RE: System() Problem/Question
6 Jan, 2008 - 06:59 PM
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QUOTE(VernonDozier @ 6 Jan, 2008 - 07:48 PM) *

How 'bout this?



CODE

#include <string>
using namespace std;

int main ()
{
     string userString;
     cout << "Enter IP Address: ";
     cin >> userString;
     userString = "ping " + userString;

     // may have to include a library for c_str, can't remember.
     system (userString.c_str ());

     return 0;
}




I believe the above, if the user enters 127.0.0.1, is equivalent to:

CODE


system ("ping 127.0.0.1");



Is this what you are trying to do?





Looks like someone beat me to it!


Technically you could uses that but when working with strings it better to uses the getline(cin, ) to get the data. I would uses cin but I am developing the user entering in more then 1 IP and need to have a string so I can manipulate the elements of the string (string is basically a character array)
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