Can't call my C++ function from QML

DavidM29

Hello,

I tried to make a C++ function that call the terminal via the system() method. But my problem is that I can't get it to work on my qml side. I have this error :

TypeError: Property 'send' of object true is not a function

I don't really understand I already have some C++ function in my QML.
Here is the code :
terminal.h :

#ifndef TERMINAL_H
#define TERMINAL_H

#include <QObject>

class Terminal : public QObject
{
    Q_OBJECT
public:
    Terminal(QObject *parent = NULL);
    Q_INVOKABLE void send(const char *commande);
};

#endif // TERMINAL_H

terminal.cpp :

#include "terminal.h"
#include <stdlib.h>

Terminal::Terminal(QObject *parent) :
    QObject(parent)
{

}

void Terminal::send(const char *commande){
    system(commande);
}

main.cpp lines to expose this Class :



#include <terminal.h>

Terminal cons();

 view->rootContext()->setContextProperty("cons", &cons);

I also have this warning :

main.cpp:40: warning: the address of 'Terminal cons()' will always evaluate as 'true' [-Waddress]
     view->rootContext()->setContextProperty("cons", &cons);

It is probably something really basic or simple but I don't see it...
Thank you for your help in advance

JonB

@DavidM29

Terminal cons();

[(I think) this declares cons as a function returning a Terminal.]

Do you not mean either:

Terminal cons;
view->rootContext()->setContextProperty("cons", &cons);

or

Terminal *cons = new Terminal;
view->rootContext()->setContextProperty("cons", cons);

?

6thC

Have you registered Terminal? http://doc.qt.io/qt-5/qtqml-cppintegration-definetypes.html
probably want something like qmlRegisterUncreatableType()

DavidM29

Thank you for your answer !
JonB you were wright ! this declared a function !
It works fine now !

Qt World Summit: Register Today!

Can't call my C++ function from QML