Qt QProcess - Example using Lambda - Run Notepad on Windows

qt_run_notepad.cpp

// ----------------------------------------------
// Open Notepad on Windows using QProcess
// Asynchronously using std::async and
// Wait for it to exit with std::future
// ----------------------------------------------

#include <QProcess>         // QProcess
#include <QDebug>           // qDebug(), qCritical(), ...

#include <future>

int runNotepad()
{
    const QString notepadExe { "C:/Windows/notepad.exe" };
    
    QProcess process;
    
    process.start( notepadExe );
    process.waitForStarted( -1 );

    if ( process.exitCode() != 0 )
    {
        qCritical() << "Exit Code: " << process.exitCode();
        return -1;
    }

    qDebug() << "Started!";

    // Wait for the process to exit asynchronously
    
    auto f = std::async( [&process]()
    {
        process.waitForFinished( -1 );
        qDebug() << "Finished!";
    });

    // ...
    // Do some synchronous work here
    // ...

    f.get();                // Wait for std::async to return
    
    return 0;
}