Qt C++ return string value - c++

Question

I have the following code:
filter.h
#pragma once
#include <QObject>
#include <QSortFilterProxyModel>
class FilterModel : public QSortFilterProxyModel
{
Q_OBJECT
public:
explicit FilterModel(QObject *parent = 0);
Q_INVOKABLE QString getText (QString text);
};
filter.cpp
#include "filter.h"
#include <QDebug>
FilterModel::FilterModel(QObject *parent) : QSortFilterProxyModel(parent) {}
QString FilterModel::getText(QString text)
{
QString qmltext = text;
qmltext != NULL ? qDebug() << qmltext
: qDebug() << "TEXT = NULL";
return qmltext;
}
main.cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include "abonentstable.h"
#include "filter.h"
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;
AbonentsSqlModel *abonentsSqlModel = new AbonentsSqlModel;
abonentsSqlModel->setQuery("SELECT * FROM abonents");
FilterModel *filterModel = new FilterModel;
filterModel->setSourceModel(abonentsSqlModel);
filterModel->setFilterKeyColumn(0);
filterModel->setFilterWildcard("9");
QQmlContext *context = engine.rootContext();
context->setContextProperty("abonents", filterModel);
context->setContextProperty("filter", filterModel);
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
return app.exec();
}
And the .qml file part:
TextField {
id: textField
...
onTextChanged: {
filter.getText(textField.text)
}
...
}
Method getText() gets text (suddenly!) from QML TextField and prints it into debugger, it works fine. But as you can see, I have code for table sorting.
The following problem is: now sorting mask is "9", it works, but I need to return QString qmltext from getText() in some way and put it into filterModel->setFilterWildcard() in main.cpp like that:
QString qmlText = filterModel.getText(QString);
...
filterModel->setFilterWildcard(qmlText);
Of course, it's just an example, it doesn't works and I don't know how to do this.

Answer 1

I do not fully understand what you want to do, but I think you need something like that (if you really need the return value):
QString FilterModel::getText(const QString& text)
{
setFilterWildcard(text);
return text;
}
By the way:
qmltext != NULL
is not working. Use instead:
qmltext.isEmpty() == false