Probelm: I have been trying to run an executable file using QProcess triggering the executable file using a QPushButton and showing the whole result of the output on QTextEdit but without success.
*The error: I don't see the whole output despite, following the official documentation I used this->executeJuliaCheck->readAllStandardOutput()
I have an executable file called check_julia.sh which is located in /home/esoMars/Alignsys/scripts/check_julia.sh which is in the qrc folder of a standard Qt5 project. The file is very simple and is below:
#!/bin/bash
echo "Checking"
cd /home/esoMars/julia-1.7.3/bin
julia
If I type on my home folder the command (base) eso@eso-Oryx-Pro:~$ julia the folloing output appears:
_ _ _(_)_ | Documentation: https://docs.julialang.org
(_) | (_) (_) |
_ _ _| |_ __ _ | Type "?" for help, "]?" for Pkg help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 1.7.3 (2022-05-06)
_/ |\__'_|_|_|\__'_| | Official https://julialang.org/ release
|__/ |
julia>
All this happens because I use the command line.
Desired goal: I would like NOT to use a command line, but rather I am trying to use a small graphical user interface where to show the output of the same command(base) eso@eso-Oryx-Pro:~$ julia
The way I am doing it is by using a QPushButton that check if julia is installed and show the output on a QTextEdit.
Below what I have done so far:
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QProcess>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
void check_julia_installation();
private slots:
void on_juliaCheckBtn_clicked();
private:
Ui::MainWindow *ui;
QProcess *executeJuliaCheck;
void executeJulia(QString command);
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QDir>
#include <QStringLiteral>
#include <iostream>
using namespace std;
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
// Check Julia Installation
check_julia_installation();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::check_julia_installation()
{
// Execution of the QProcess
this->executeJuliaCheck = new QProcess(this);
this->executeJuliaCheck->setProcessChannelMode(QProcess::MergedChannels);
QObject::connect(this->executeJuliaCheck, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
[this](int exitCode, QProcess::ExitStatus exitStatus){
qDebug() << "CODE " << exitCode << exitStatus;
if(exitCode == 0)
{
QString stdOutput = QString::fromUtf8(this->executeJuliaCheck->readAllStandardOutput());
qDebug() << stdOutput;
ui->textEdit->setText(stdOutput);
ui->outputLineEdit->setText("SUCCESS: JULIA IS PROPERLY INSTALLED");
}
else
{
QString stdErr = QString::fromUtf8(this->executeJuliaCheck->readAllStandardError());
qDebug() << stdErr;
QString stdOutput = QString::fromUtf8(this->executeJuliaCheck->readAllStandardOutput());
qDebug() << stdOutput;
ui->textEdit->setText(stdErr + "\n" + stdOutput);
ui->outputLineEdit->setText("CONNECTION ERROR: JULIA NOT PRESENT");
}
ui->juliaCheckBtn->setEnabled(true);
});
}
void MainWindow::on_juliaCheckBtn_clicked()
{
this->executeJuliaCheck->start("sh",QStringList() << "-c" << "echo /home/esoMars/Alignsys/scripts/check_julia.sh");
if(! this->executeJuliaCheck->waitForStarted()) //default wait time 30 sec
qWarning() << " cannot start process ";
int waitTime = 60000 ; //60 sec
if (! this->executeJuliaCheck->waitForFinished(waitTime))
qWarning() << "timeout .. ";
this->executeJuliaCheck->waitForFinished();
ui->juliaCheckBtn->setEnabled(true);
}
Updates
A user suggested to reduce the clicked button to the following statement. I tried that but unfortunately the QProcess does not do anything:
void MainWindow::on_juliaCheckBtn_clicked()
{
this->executeJuliaCheck->waitForStarted();
this->executeJuliaCheck->start("sh",QStringList() << "-c" << "echo /home/esoMars/Alignsys/scripts/check_julia.sh");
ui->juliaCheckBtn->setEnabled(true);
}
I looked up QProcess quite a while before writing and searched a lot. I found quite a few posts that I read and studied to understand the problem. One post suggested to look at setWorkingDirectory which I did but that didn't help much.
Another posts suggested to use for waitForFinished() just in case other processes are running but it is not my case. Despite a clean exit I don't see the whole output. However, for debugging reasons I put this->executeJuliaCheck->start("sh",QStringList() << "-c" << "echo /home/esoMars/Alignsys/scripts/check_julia.sh"); so that I could confirm the executable file read. However, I still can't see the whole output
I looked also at additional posts such as this one but I still could not figure out how to show the whole output.
Thanks for pointing in the right direction.
