Real time display of QProcess output in a textBrowser

Question

I am a newbie in qt development and i want to transfer the output of QProcess to a textBrowser in real time. I started by executing a simple echo command,but the output of the program is not getting displayed. What am i doing wrong???? ``` QProcess p; p.start("echo hye"); QByteArray byteArray = p.readAllStandardOutput(); QStringList strLines = QString(byteArray).split(" "); QString line= p.readAllStandardOutput(); if(p.state()==QProcess::NotRunning) ui->textBrowser->append("not running"); foreach (QString line, strLines){ ui->textBrowser->append(line);} ``` P.S. I am on a linux machine. EDIT: I am still not able to get the output in a textBrowser . I changed the Qprocess parameters and tried both waitForStarted() and waitForReadyRead() so that the process starts in time and the results are available. I added waitForFinished() so that the process does not terminate when it goes out of scope. ``` QProcess p; p.start("echo", QStringList() << "hye"); p.waitForStarted(); QByteArray byteAr…

Accepted Answer

to read standard output you need to either call `waitForReadyRead()` before reading stardard output , or you need to connect Qprocess's signal `readyReadStandardOutput()` to your slot and read standard output from slot.

also make sure that your QProcess is not on stack.

I tried following code works fine.

EDIT:

```
MyProcess::MyProcess(QObject *parent) :
    QObject(parent)
{
    QString program = "echo";
    QStringList arguments;
    arguments << "Hello";
    mProcess.start(program,arguments);
    connect(&mProcess,SIGNAL(readyReadStandardOutput()),this,SLOT(readyReadStandardOutput()));
    connect(&mProcess,SIGNAL(readyReadStandardError()),this,SLOT(readyReadStandardError()));
}

void MyProcess::readyReadStandardOutput(){
    qDebug()<< mProcess.readAllStandardOutput();
}

void MyProcess::readyReadStandardError(){
    qDebug() << mProcess.readAllStandardError();
}
```

Real time display of QProcess output in a textBrowser

Solution

Problem