Try doing it the proper way -- connect the readyReadStandardOutput() signal from your process to a slot and read the data there, and don't read a single line, but rather all of them at once.

Qt Code: 
  1. QProcess *process = new QProcess(...);
  2. connect(process, SIGNAL(readyReadStandardOutput ()), this, SLOT(fetchOutput()));
  3. connect(process, SIGNAL(finished ( int, QProcess::ExitStatus )), this, SLOT(fetchRest()));
  4. process->start("...");
  5. //...
  6.  
  7. void thisClass::fetchOutput(){
  8.   QProcess *proc = (QProcess*)sender();
  9.   while(proc->canReadLine()){
  10.     cout << proc->readLine().constData() << endl;
  11.   }
  12. }
  13.  
  14. void thisClass::fetchRest(){
  15.   QProcess *proc = (QProcess*)sender();
  16.   cout << proc->readAllStandardOutput().constData();
  17. }
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