QT: how to show linux command output in text browser -

i want run linux command programmatically , show output in text browser. here code:

void mainwindow::on_pushbutton_clicked(){ qstring  qstr;  file *cl = popen("ifconfig eth0", "r"); char buf[1024]; while (fgets(buf, sizeof(buf), cl) != 0) {     qstr = qstring::fromutf8(buf);     ui->textbrowser->settext(qstr); } pclose(ls); } 

but got nothing in text browser. if change qstr in ui->textbrowser->settext(qstr); arbitrary "string",it works fine. helps?! thanks.

in example popen use:

 qstr += qstring::fromutf8(buf); 

but better use qprocess. dynamic output use:

qprocess* ping_process = new qprocess(this); connect(ping_process, &qprocess::readyreadstandardoutput, [=] {     ui->textbrowser->append(ping_process->readallstandardoutput()); }); ping_process->start("ping", qstringlist() << "8.8.8.8"); 

for use lambda not forget add in .pro file:

config += c++11