将QProcess输出发送到textedit的最佳方法

Question

currently I start another program via QProcess and connect the read readyReadStandardOutput to a slot:

QProcess *start = new QProcess(this);
start->start(program,arguments);
connect(start, SIGNAL(readyReadStandardOutput()), log, SLOT(readyReadStandardOutput()));
connect(start, SIGNAL(readyReadStandardError()), log, SLOT(readyReadStandardError()));

log is of type myTextBrowser

class myTextBrowser : public QTextBrowser{
...
public slots:
void readyReadStandardOutput();
void readyReadStandardError();
...
}

the slots look something like this:

void myTextBrowser::readyReadStandardOutput(){
    QProcess *p = qobject_cast<QProcess*>(sender());
    QString txt (p->readAllStandardOutput());
    ...
    setText(txt);
}

The problem is, that there is a big latency. The text in my GUI only gets updated every couple of seconds, sometimes even close to a minute.

Is there a more elegant solution to forward the output to another widget?

Please note that the called program could run for a hour but the displayed output is not very long... But it is not possible to waitForFinished because I want that the GUI is still usable while the process runs.

Answer 1

My slot works fine and looks like this:

void EcuAppControl::readStandardOutput()
{
  QProcess *p = qobject_cast<QProcess*>(sender());
  p->setReadChannel(QProcess::StandardError);
  while(p->canReadLine())
  {
    qDebug() << p->readLine();
  }
}

Make sure you use Qt::DirectConnection . But this should be default.