QT qScriptConnect is not working

Question

QScriptEngine eng;
QScriptEngineDebugger debugger;
debugger.attachTo(&eng);
QScriptValue consoleObj =  eng.newQObject(this);
eng.globalObject().setProperty("asd", consoleObj);
QScriptValue handler= eng.evaluate("(function(text) { asd.log('text was changed to '+text); })");
QLineEdit *edit = new QLineEdit(this);
qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler);
edit->show();

qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler) is not working, but when i am using handler.call(QScriptValue(),args) it works well;

QScriptValueList args;
args << 3;
handler.call(QScriptValue(),args);

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
      Q_INVOKABLE void log(QString msg);
    ~MainWindow();

private slots:

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<qscriptengine.h>
#include<qscriptenginedebugger.h>
#include<qlineedit.h>
#include<qdebug.h>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QScriptEngine eng;
    QScriptEngineDebugger debugger;
    debugger.attachTo(&eng);
    QScriptValue consoleObj =  eng.newQObject(this);
    eng.globalObject().setProperty("asd", consoleObj);
    QScriptValue handler= eng.evaluate("(function(text) { asd.log('text was changed to '+text); })");
    QLineEdit *edit = new QLineEdit(this);
    qDebug()<<qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler);
    edit->show();
}

MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::log(QString msg)
{
    qDebug() << "jsConsole: "<< msg;
}

What does it mean of *is not working*? that description is very ambiguous — eyllanesc, May 26 '18 at 00:26
qScriptConnect returns true but when line edit's text changes nothing happens.. doesn't works that slot — Nishad, May 26 '18 at 00:28
You have to created a q_invokable function called log(Qstring).. — Nishad, May 26 '18 at 00:37
I am calling that c++ function from js... Log function prints to application out put console using qdebug — Nishad, May 26 '18 at 00:42
That's what I meant with MCVE, the code you showed initially did not show the cause of the error. — eyllanesc, May 26 '18 at 01:57

score 1 · Accepted Answer · answered May 26 '18 at 01:54

A variable created in a method that is not created in the heap is deleted when it finishes executing the method, in your case the QScriptEngine is created in the constructor reason why it is eliminated, and all the script depends on it. The solution is simple, make the QScriptEngine member of the class:

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QScriptEngine>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

    Q_INVOKABLE void log(const QString & text);

private:
    Ui::MainWindow *ui;
    QScriptEngine eng; // member
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QLineEdit>
#include <QScriptEngine>
#include <QScriptEngineDebugger>

#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QScriptEngineDebugger debugger;
    debugger.attachTo(&eng);
    QScriptValue consoleObj =  eng.newQObject(this);
    eng.globalObject().setProperty("asd", consoleObj);
    QScriptValue handler= eng.evaluate("(function(text) { asd.log('text was changed to '+text); })");
    QLineEdit *edit = new QLineEdit(this);
    qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler);
    edit->show();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::log(const QString &text)
{
    qDebug()<< text;
}

QT qScriptConnect is not working

1 Answers1