How to set ip address to a computer in Qt (Solved)

houmingc

i vi a file in /home/ubuntu/passwd.txt with my password. Debug the code. After Application finished running, i do a ifconfig in ubuntu terminal. The ip address has not been changed

@
void SetpcAddress{

                       QProcess *myProcess = new QProcess();
                       QStringList args;
                       args<<"-c"<<
  "sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
                        myProcess->start("/bin/sh",args);

}

int main(void)
{

             SetpcAddress();

}

@

p3c0

Does that command work from outside ?

p3c0

Does that command work from outside ?

houmingc

cat passwd.txt return my password correct

houmingc

cat passwd.txt return my password correct

houmingc

it works when i do a sudo su
it doesn't work without permission, what should i do next?

houmingc

it works when i do a sudo su
it doesn't work without permission, what should i do next?

p3c0

It does work for me from the App and Outside
@
args<<"-c"<<
"sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
@

There should be a space before and after < in above command.

p3c0

It does work for me from the App and Outside
@
args<<"-c"<<
"sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
@

There should be a space before and after < in above command.

houmingc

under /opt
cat >password.txt 'Key in my password'
cat password 'Check my password'

its work, thanks alot :>>

houmingc

under /opt
cat >password.txt 'Key in my password'
cat password 'Check my password'

its work, thanks alot :>>

p3c0

Well then get the errors using readyReadStandardError() signal if any.

p3c0

Well then get the errors using readyReadStandardError() signal if any.

houmingc

what does "-c" in front of "sudo -s" meant or used for??

houmingc

what does "-c" in front of "sudo -s" meant or used for??

p3c0

It is for sh so that it reads commands from argument strings. Check "this":http://manpages.ubuntu.com/manpages/utopic/en/man1/sh.1posix.html man page for more details. I hope your system has sh command.

p3c0

It is for sh so that it reads commands from argument strings. Check "this":http://manpages.ubuntu.com/manpages/utopic/en/man1/sh.1posix.html man page for more details. I hope your system has sh command.

houmingc

QProcess Class is used to start external programs and to communicate with them.
create a new QProcess and input args to /bin/sh.
Below code has been tested working.
Thanks to p3c0, if not, answer below will not be available :

QProcess *myProcess = new QProcess;
QStringList args;
args<"-c"<<"sudo -S ifconfig eth0 192.168.100.1 < /var/passwd.txt");
myProcess->start("/bin/sh",args);