CODEWITHSUNDEEP
c++qt
Xweque
Xweque

Reputation: 645

Convert nativeObject to QObject qt5 c++

I am having problems using the QObject. In my code I attempt to add a object to Javascript in Qt5. 

#include <QtGui>
#include <QtWebKit>
#include <QApplication>
#include <QWebView>
#include <QWebFrame>
#include <QWebPage>
#include <iostream>
#include <string>

using namespace std;

class nativeObject : public QObject {
    Q_OBJECT
    public:
        string version;
};

int main(int argc, char** argv) {
    nativeObject test;
    test.version = "BETA";

    QApplication app(argc, argv);
    QWebView view;
    QWebFrame *frame = view.page()->mainFrame();
    frame->addToJavaScriptWindowObject("someNameForMyObject", &test);
    view.setUrl(QUrl("http://google.com"));
    view.show();

    return app.exec();
}

Running the code gives the following errors:

main.obj:-1: error: LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall nativeObject::metaObject(void)const " (?metaObject@nativeObject@@UBEPBUQMetaObject@@XZ)

main.obj:-1: error: LNK2001: unresolved external symbol "public: virtual void * __thiscall nativeObject::qt_metacast(char const *)" (?qt_metacast@nativeObject@@UAEPAXPBD@Z)

main.obj:-1: error: LNK2001: unresolved external symbol "public: virtual int __thiscall nativeObject::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@nativeObject@@UAEHW4Call@QMetaObject@@HPAPAX@Z)

release\webkit.exe:-1: error: LNK1120: 3 unresolved externals

I cannot find any "good" and relevant documentation as I am very new in programming in qt and C++. Have I declared the QObject incorrectly or is there something else I am doing wrong?

Upvotes: 0

Views: 225

Answers (1)

Jablonski
Jablonski

Reputation: 18504

Try this:

frame->addToJavaScriptWindowObject("someNameForMyObject", &test);

It requires QObject* but you set QObject.

void QWebFrame::addToJavaScriptWindowObject(const QString & name, QObject * object, ValueOwnership own = QtOwnership)

& used here to get address of object because it is not a pointer, you can also create nativeObject as pointer:

nativeObject *test = new nativeObject;

In this case

frame->addToJavaScriptWindowObject("someNameForMyObject", test);

will be valid because test is already pointer. Note that for pointers we use -> instead of .

Upvotes: 1

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