Qt 5 Play wav sound while input from user - c++

Question

My program alerts the user when something has happened. To get his attention, a alert sound plays. It stops when the user enter something to confirm receipt.
But the QTextStream input blocks the sound !
When I remove it, the sound plays perfectly.
Besides, the "alert" QSound object doesn't work. The only way to play is to use the static function QSound::play("file.wav"). But it can't be stopped.
Here is my code :
#include <QCoreApplication>
#include <QSound>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
/*
QSound alert("../SoundAlerte/alert.wav");
alert.setLoops(QSound::Infinite);
alert.play();
*/
QSound::play("../SoundAlerte/alert.wav");
qDebug() << "ALERT";
qDebug() << "Enter Something to confirm receipt" ;
QTextStream s(stdin);
QString value = s.readLine();
qDebug() << "Received !";
//alert.stop();
qDebug() << "Sound stopped";
return a.exec();
}
It seems like it can't play a sound and wait for input at the same time !
Do you have have an idea on how to proceed ?
Thanks

Answer 1

QSound::play is asynchron, but
QString value = s.readLine();
contains a do-while and will block the audio file. See scan function called by readLine()
A working example would be QtConcurrent, but you can't stop the audio file, so you might want to switch to a real QThread approach.
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QFuture<void> future = QtConcurrent::run([]() {
QSoundEffect effect;
QEventLoop loop;
effect.setSource(QUrl::fromLocalFile("C:\\piano2.wav"));
effect.setVolume(0.25f);
effect.play();
QObject::connect(&effect, &QSoundEffect::playingChanged, [&loop]() { qDebug() << "finished"; loop.exit(); });
loop.exec();
});
QTextStream s(stdin);
QString value = s.readLine();
return a.exec();
}