CODEWITHSUNDEEP
c++qtqprocess
sanab3343
sanab3343

Reputation: 174

Get output of cmd command in real time in Qt

Im using this code in Qt to get output of a cmd commend

     QProcess c_output;
     c_output.start("some-exe", QStringList() << "param1" << "param2" << "param3...");
     if (!c_output.waitForStarted())
         std::cout << false;

     c_output.write("...");
     c_output.closeWriteChannel();

     if (!c_output.waitForFinished())
         std::cout << false;

its work just good.
with this code i can access output with c_output.readAll(), but problem is this code wait until cmd finish exec ... and then give all output in c_output.readAll(), i want to get output in realtime and show them in gui of my program
my mean is my commend print multiply lines after exec, i want to show all of them one by one in my program and not wait for it to finish.

Upvotes: 1

Views: 856

Answers (1)

zgyarmati
zgyarmati

Reputation: 1153

You can use waitForReadyRead instead of the waitForFinished , see at https://doc.qt.io/qt-5/qprocess.html#waitForReadyRead

Here is a simple example with the usage:

#include <QCoreApplication>
#include <QFile>
#include <QTextStream>
#include <QProcess>
#include <QDebug>

int main(int argc, char *argv[])
{

    QCoreApplication app(argc, argv);
    QProcess c_output;
    c_output.setProcessChannelMode(QProcess::MergedChannels);
     c_output.start("dmesg", QStringList() << "-w");
     if (!c_output.waitForStarted()){
         qDebug() << "Failed to start";
        return -1;
     }

     c_output.write("...");
     c_output.closeWriteChannel();

     while (c_output.state() != QProcess::NotRunning)
     {
        qDebug() << ".";
        if (c_output.waitForReadyRead())
         qDebug() << "c_output" << c_output.readAllStandardOutput();
     }


    return app.exec();
}

Upvotes: 2

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