1 std::string setip = "ifconfig eth0 " +lineEdit_NetIp->text().toStdString() + " netmask " + lineEdit_NetMask->text().toStdString() + " && echo 1";
 2     std::string setroute = "echo 1;route del default;route add default gw " + ui->lineEdit_NetGate->text().toStdString();
 3     FILE *fp = popen(setip.c_str(), "r");
 4     if (NULL == fp)
 5     {
 6         msgBox.setInformativeText(tr("The IP address is unusable!"));
 7         msgBox.exec();
 8         return;
 9     }
10     char getway[16] = {0};
11     if (NULL == fgets(getway, 16, fp))
12     {
13         pclose(fp);
14         msgBox.setInformativeText(tr("The IP address is unusable!"));
15         msgBox.exec();
16         return;
17     }
18     if (getway[0] != '1')
19     {
20         msgBox.setInformativeText(tr("The IP address is unusable!"));
21         msgBox.exec();
22         return;
23     }    
24     pclose(fp);
25     fp = NULL;

 1 fp = popen(setroute.c_str(), "r");
 2     if (NULL == fp)
 3     {
 4         msgBox.setInformativeText(tr("The route address is unusable!"));
 5        msgBox.exec();
 6         exit(0);
 7    }
 8 
 9    char route[16] = {0};
10 
11    if (NULL == fgets(route, 16, fp))
12    {
13         pclose(fp);
14         msgBox.setInformativeText(tr("The route address is unusable!"));
15         msgBox.exec();
16         exit(0);
17    }
18     pclose(fp);
19 
20     if (route[1] != 0)
21    {
22        msgBox.setInformativeText(tr("The route address is unusable!"));
23         msgBox.exec();
24         exit(0);
25     }