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#include <QDebug>
int main()
{
qDebug()<<"text";
return 0;
}

#include "mainwindow.h"
MainWindow::MainWindow()

{
   more = new QProcess(this);
   more->start("C:/Qt_myProgramm/build-textForProcess-Desktop-Debug/debug/textForProcess"); //путь до .exec
  connect (more, SIGNAL(readyRead()),SLOT(write()));
}

void MainWindow::write()
{
qDebug()<<more->readAllStandardOutput();
}

#include <QProcess>
#include <QDebug>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow();
    QProcess *more;
public slots:
   void write();
};

#endif // MAINWINDOW_H

more->setReadChannel(QProcess::StandardError);

#include <QFile>
#include <QTextStream>
#include <QString>
int main()
{   
   QFile outFile;
    outFile.setFileName("out.txt");
    QTextStream stream (&outFile);
    outFile.open(QIODevice::ReadWrite);
    QString str;
    str=stream.readAll();
    stream<<str;//записывает в файл
    outFile.close();
return 0;
}

#include "mainwindow.h"
#include <iostream>
using namespace std;
MainWindow::MainWindow()

{
    lineEdit = new QLineEdit;
    lay = new QHBoxLayout;
    lay->addWidget(lineEdit);
    setLayout(lay);

    process = new QProcess(this);
    process->setProcessChannelMode(QProcess::MergedChannels);
    connect(process, SIGNAL(readyRead()), this, SLOT(output()));
    process->start("C:/Qt_myProgramm/build-untitled4-Desktop-Debug/debug/untitled4");
    process->waitForStarted(10000);
  
    

void MainWindow::output()
{
   QByteArray array = process->readAllStandardOutput();
    QTextStream stream2(array);
    QString str2 = stream2.readAll();
    lineEdit->setText(str2);

}

putchar('y');