Unable to populate ComboBox model with QVariantList - c++

Question

From QML:
AudioInfoCpp is the C++ class's object. Aim to to get data from C++ and fill it in the model of the combobox.
property ListModel comboModel: cbItems
AudioInfoCpp
{
id: audioInfoCpp
Component.onCompleted:
{
fetchInputDevices()
comboModel.append(inputDevices1)
console.log(inputDevices1)
}
}
ComboBox
{
id: comboBoxM;
width: 100
model: audioInfoCpp.inputDevices1;
textRole: "langDescription";
}
From .h
#ifndef AUDIOINFO_H
#define AUDIOINFO_H
#include <QAudioDeviceInfo>
#include <QList>
#include <QVariantList>
class AudioInfo : public QObject
{
Q_OBJECT
protected:
QAudioDeviceInfo objQAudioDeviceInfo;
public:
AudioInfo();
Q_PROPERTY(QVariantList inputDevices1 READ inputDevices1 WRITE setInputDevices1 NOTIFY inputDevices1Changed)
Q_INVOKABLE void fetchInputDevices();
QVariantList inputDevices1() const
{
return m_inputDevices1;
}
public slots:
void setInputDevices1(QVariantList inputDevices1)
{
if (m_inputDevices1 == inputDevices1)
return;
m_inputDevices1 = inputDevices1;
emit inputDevices1Changed(m_inputDevices1);
}
signals:
void inputDevices1Changed(QVariantList inputDevices1);
private:
QVariantList m_inputDevices1;
};
#endif // AUDIOINFO_H
.cpp :
void AudioInfo::fetchInputDevices()
{
QList<QAudioDeviceInfo> devices1 = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);
if (devices1.empty())
{
qDebug() << "No audio input devices";
}
QVariantList tt;
for (const QAudioDeviceInfo& device : devices1)
{
tt.append(device.deviceName());
}
setInputDevices1( tt );
}
In QML as well as CPP I can see the data printed from the list but I am not able to populate the combobox. There are no errors.
Please guide.

Answer 1

The problem comes from this line:
textRole: "langDescription"
That means it will look through each element in your model for the langDescription field. But you are populating your QVariantList with QStrings:
QVariantList tt;
for (const QAudioDeviceInfo& device : devices1)
{
tt.append(device.deviceName());
}
QStrings don't have a langDescription field, so nothing gets displayed.
To solve this try completely removing the textRole line and allow QML to automatically figure out how to display the names correctly.