Why can't ie11 load the DLL generated by the qt-5.6/activeqt-hierarchy-example?

hskoglund

If you look in the Hiierarchy example, there are already some signals sent from Javascript to the C++ code, for example this line in Javascript:

function createSubWidget( form )
{
    ParentWidget.createSubWidget( form.nameEdit.value );
}

which arrives to this C++ code in objects.cpp:

void QParentWidget::createSubWidget(const QString &name)
{
    QSubWidget *sw = new QSubWidget(this, name);
    m_vbox->addWidget(sw);
    sw->setLabel(name);
    sw->show();
}

So if you want to implement your own signal in Javascript to a slot in C++ try to copy that example...

mirro

@hskoglund said in Why can't ie11 load the DLL generated by the qt-5.6/activeqt-hierarchy-example?:

So if you want to implement your own signal in Javascript to a slot in C++ try to copy that example...

sorry,I want to implement own slot in Javascript to a signal in C++. What to do?

hskoglund

Aha, you mean you want the other way around? Start with C++ in Qt, emit a signal from there into IE11, which will then launch some Javascript code?

It's supported by ActiveQt, you just use the normal signals: keyword, let's add a timeout event to the hiearchy example above:

to communicate with the Javascript code you can declare C++ variables using the Q_PROPERTY keyword.
So at the top of objects.h I added a timer timeout variable:

...
class QParentWidget : public QWidget
{
    Q_OBJECT

    Q_PROPERTY( int timeout READ timeout WRITE setTimeout )

    Q_CLASSINFO("ClassID", "{d574a747-8016-46db-a07c-b2b4854ee75c}");
    Q_CLASSINFO("InterfaceID", "{4a30719d-d9c2-4659-9d16-67378209f822}");
    Q_CLASSINFO("EventsID", "{4a30719d-d9c2-4659-9d16-67378209f823}");
public:
    QParentWidget(QWidget *parent = 0);

    QSize sizeHint() const;
    int timeout() const { return 0; };      // dummy (not used)

signals:
    void signalFromQt(QString);

public slots:
    void createSubWidget( const QString &name );
    QSubWidget *subWidget( const QString &name );
    void setTimeout( const int value);      // this one we call from Javascript

private:
    QVBoxLayout *vbox;
};
...

then in objects.cpp
I added #include "qtimer.h" and the setTimeout function:

...
void QParentWidget::setTimeout(const int value)
{
    static int i = 0;
    QTimer::singleShot(value * 1000,[this] { signalFromQt("Hello no.:" + QString::number(++i)); });
}
...

finally I modifed test.html to this:

<script language="javascript">
function createSubWidget( form )
{
    ParentWidget.createSubWidget( form.nameEdit.value );
}

function renameSubWidget( form )
{
    var SubWidget = ParentWidget.subWidget( form.nameEdit.value );
    if ( !SubWidget ) {
        alert( "No such widget " + form.nameEdit.value + "!" );
        return;
    }
    SubWidget.label = form.labelEdit.value;
    form.nameEdit.value = SubWidget.label;
}

function setTimeout( form )
{
    ParentWidget.timeout = form.timerEdit.value;
}
</script>

<p>
This widget can have many children!
</p>
<object ID="ParentWidget" CLASSID="CLSID:d574a747-8016-46db-a07c-b2b4854ee75c"
CODEBASE="C:\Qt\Examples\Qt-5.7\activeqt\build-hierarchy-Desktop_Qt_5_7_1_MSVC2013_32bit-Release\release\hierarchyax.dll">
[Object not available! Did you forget to build and register the server?]
</object><br />
<form>
<input type="edit" ID="nameEdit" value="" />
<input type="button" value="Create" onClick="createSubWidget(this.form)" />
<input type="edit" ID="labelEdit" />
<input type="button" value="Rename" onClick="renameSubWidget(this.form)" />
<br />
<input type="edit" ID="timerEdit" value="2" />
<input type="button" value = "set Timeout" onClick="setTimeout(this.form)" />
</form>

<script language="javascript">
function ParentWidget::signalFromQt( Message )
{
    alert ("Got a signal from Qt: " + Message);
}
</script>

I tossed the setFont() functionality and instead I added the "set Timeout" button. Every time you press it, the QTimer::singleShot will be armed and when it fires it will emit the signalFromQt() which is caught by the Javascript code ParentWidget::signalFromQt()

Edit: note that in the test.html file above, the Javascript code for the function ParentWidget::signalFromQt() is at the end, because it has to be placed after the object ID="ParentWidget".... html code ifor the signal to work and the alert box to be shown. Don't know if this is a bug or a feature :-)

mirro

@hskoglund hi~thank you again!
I can receive a signal from qt in javascript now. But there's a problem.
I'm sending a qt setTimeout() signal to change IE11 window size and ActiveQT window size.
What's wrong with the javascript ? Why doesn't it change window size ? the following code.

class osgActiveGLQT : public QWidget,public QAxBindable
{
	Q_OBJECT
	Q_PROPERTY(QString WindowSize READ getWindowSize WRITE setWindowSize)
public:
	osgActiveGLQT(QWidget *parent = 0);
	QSize sizeHint() const
	{
		return QWidget::sizeHint().expandedTo(QSize(100, 100));
	}
	QString getWindowSize() const
	{
		return _strWindowSize;
	} 
private:
	//Ui::osgActiveGLQTClass ui;
signals:
	void signalFromQt(QString);

public slots:
	void setWindowSize(const QString &string);
	void resetWindowSize(const QString &string);
public slots:
	void setTimeout();// this one we call from Javascript
private:
	QString    _strWindowSize;
	bool       _isFullScreen;
private:
	QPushButton* _windowSizeButton;
};

osgActiveGLQT::osgActiveGLQT(QWidget *parent)
	: QWidget(parent), _strWindowSize("0,0"), _isFullScreen(false)
{
	if (this->objectName().isEmpty())
		this->setObjectName(QStringLiteral("osgActiveGLQTClass"));
	//this->resize(900, 600);
	_windowSizeButton = new QPushButton(this);
	_windowSizeButton->setObjectName(QStringLiteral("windowSizeButton"));
	_windowSizeButton->setGeometry(QRect(10, 5, 75, 23));
	_windowSizeButton->setText(QString::fromLocal8Bit("FullWindow"));
	connect(_windowSizeButton, SIGNAL(clicked()), this, SLOT(setTimeout()));
}

void osgActiveGLQT::setWindowSize(const QString &string)
{
	if (!requestPropertyChange("WindowSize"))
		return;

	propertyChanged("WindowSize");

	_strWindowSize = string;
	int curIndex = _strWindowSize.indexOf(",");
	QString wid  = _strWindowSize.mid(0, curIndex);
	QString hei  = _strWindowSize.mid(curIndex + 1, _strWindowSize.length());
	//
	//
	//resize(wid.toInt(), hei.toInt());
	//update();
}
//
void osgActiveGLQT::resetWindowSize(const QString &string)
{
	QString strWindowSize = string;
	int curIndex   = strWindowSize.indexOf(",");
	QString wid    = strWindowSize.mid(0, curIndex);
	QString hei    = strWindowSize.mid(curIndex + 1, strWindowSize.length());
	//
	//QMessageBox::information(this, "About QSimpleAX", strWindowSize);

	//resize(wid.toInt(), hei.toInt());
	//update();
}

void osgActiveGLQT::setTimeout()
{
	_isFullScreen = !_isFullScreen;
	if (_isFullScreen)
	{
		QRect rct = QApplication::desktop()->availableGeometry();
		static int screenWidth  = rct.width();
		static int screenHeight = rct.height();
		QTimer::singleShot(150, [this] { signalFromQt(QString::number(screenWidth) + "," + QString::number(screenHeight)); });
		_windowSizeButton->setText(QString::fromLocal8Bit("resetWindow"));
	}
	else
	{
		int curIndex = _strWindowSize.indexOf(",");
		QString wid  = _strWindowSize.mid(0, curIndex);
		QString hei  = _strWindowSize.mid(curIndex + 1, _strWindowSize.length());
		static int screenWidth  = wid.toInt();
		static int screenHeight = hei.toInt();
		QTimer::singleShot(150, [this] { signalFromQt(QString::number(screenWidth) + "," + QString::number(screenHeight)); });
		_windowSizeButton->setText(QString::fromLocal8Bit("fullWindow"));
	}
}

<object ID ="osgActiveGLQT" HSPACE="0" VSPACE="0" WIDTH="900" HEIGHT="600" CLASSID="CLSID:B0545661-8607-43BA-A1C2-B43C0A93D976">
<PARAM NAME="WindowSize" VALUE ="900,600" />
[Object not available! Did you forget to build and register the server?]
</object>


<script language="javascript">
function osgActiveGLQT::signalFromQt( Message )
{
    //alert ("Got a signal from Qt: " + Message);
	var curIndex = Message.indexOf(",");  //
	var widthFormQt  = Message.substr(0,curIndex);
	var heightFormQt = Message.substr(curIndex+1, Message.length);  //
	
	document.getElementById("osgActiveGLQT").style.WIDTH  = widthFormQt;
	document.getElementById("osgActiveGLQT").style.HEIGHT = heightFormQt;
	
	var IntwidthFormQt  = parseInt(widthFormQt);
	var IntheightFormQt = parseInt(heightFormQt);
	
	window.moveTo(0,0);//
	window.resizeTo(IntwidthFormQt,IntheightFormQt);//
	var strWindowSize = "window.resizeTo(" + widthFormQt + "," + heightFormQt + ");";
	
	//osgActiveGLQT.resetWindowSize(Message);
}
</script>

hskoglund

Hmm, looked at your code, C++ seems ok, but the Javascript window resizing stuff I don't know, I'm not that good with Javascript.

If you put back that alert, does it work and show the correct message (width,height)?

If so, then perhaps you need some kind of update/refresh of the window at the end, so make the resizing visible.

mirro

@hskoglund I put back that alert, It shows the correct width and height.

How do I reset width and height styles of osgActiveGLQT in javascript?

<object ID ="osgActiveGLQT" HSPACE="0" VSPACE="0" WIDTH="900" HEIGHT="600" CLASSID="CLSID:B0545661-8607-43BA-A1C2-B43C0A93D976">
<PARAM NAME="WindowSize" VALUE ="900,600" />
[Object not available! Did you forget to build and register the server?]
</object>

hskoglund

Don't think it's possible to do in Javascript, but what I do know, is that it's pretty easy to change width and height of a QWidget (e.g. setGeometry(), same as in osgActiveGLQT's constructor)

So, easiest would be to implement 2 new slots in your C++ code for the osgActiveGLQT object, for example setHeight() and setWidth().
Then you could call those 2 functions from Javascript, in the same way you call setTimeout() now.

mirro

@hskoglund the following code successfully changes window size in javascript.

<script language="javascript">
function ResetWidget()
{
     var e1 = document.getElementById("ParentWidget");
     e1.style.width  = "1000px";
     e1.style.height = "800px";
}
</script>

<object ID="ParentWidget" WIDTH="900" HEIGHT="600" CLASSID="CLSID:d574a747-8016-46db-a07c-b2b4854ee75c"
CODEBASE="http://www.qt-project.org/demos/hierarchy.cab">
[Object not available! Did you forget to build and register the server?]
</object><br />
<form>
<input type="button" value="ResetWidget" onClick="ResetWidget()" />
</form>

mirro

Why is the activeQT window size wrong when i set window size injavascript?

The following screenshots and code
link text

<object ID ="osgActiveGLQT" WIDTH = "900" HEIGHT = "600" CLASSID="CLSID:B0545661-8607-43BA-A1C2-B43C0A93D976">
[Object not available! Did you forget to build and register the server?]
</object>

#ifndef ActiveQTOSGWidget_H
#define ActiveQTOSGWidget_H

#include <iostream>

#include <QtWidgets/QWidget>
#include <QtWidgets/QLayout>
#include <QtWidgets/QApplication>
#include <QtWidgets/QLCDNumber>
#include <QTimer>
#include <QMessageBox>

#include <osgViewer/CompositeViewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgGA/MultiTouchTrackballManipulator>
#include <osgDB/ReadFile>
#include <osgQt/GraphicsWindowQt>
#include <osg/PolygonOffset>

class ActiveQTOSGWidget : public QWidget
{
public:
	ActiveQTOSGWidget(QWidget *parent = 0);
public:
	virtual void paintEvent(QPaintEvent* event)
	{
		// Update the camera
		QPainter paint(this);
		QPen pen;
		pen.setColor(QColor(255, 0, 0));
		QBrush brush(QColor(255, 0, 0));
		paint.setPen(pen);
		paint.setBrush(brush);
		int ss = width();
		paint.drawRect(0, 0, width(), height());
	}
};
#endif // OSGVIEW_H

#ifndef OSGACTIVEGLQT_H
#define OSGACTIVEGLQT_H
#include <iostream>

#include <QtWidgets/QWidget>
#include <ActiveQt/QAxBindable>
#include <QtWidgets/QLayout>
#include <QtWidgets/QApplication>
#include <QtWidgets/QLCDNumber>
#include <QTimer>
#include <QApplication>
#include <QDesktopWidget>
#include <QMessageBox>
#include <QPushButton>

#include "ui_osgactiveglqt.h"

#include "ActiveQTOSGWidget.h"

class osgActiveGLQT : public QWidget,public QAxBindable
{
	Q_OBJECT
public:
	osgActiveGLQT(QWidget *parent = 0);
private:
	Ui::osgActiveGLQTClass ui;
};

#endif // OSGACTIVEGLQT_H

hskoglund

Nice! Resizing is most likely is part of the ActiveX specification, and ActiveQt being of good quality supports it.

mirro

@hskoglund

Is... there? Why is the activeQT window's size less than QT Createor window's size when I set the size of 'WIDTH' and 'HEIGHT' Properties of ActiveQT Object in javascript?

The following screenshots and code
link text

<object ID ="osgActiveGLQT" WIDTH = "900" HEIGHT = "600" CLASSID="CLSID:B0545661-8607-43BA-A1C2-B43C0A93D976">
[Object not available! Did you forget to build and register the server?]
</object>

#ifndef ActiveQTOSGWidget_H
#define ActiveQTOSGWidget_H

#include <iostream>

#include <QtWidgets/QWidget>
#include <QtWidgets/QLayout>
#include <QtWidgets/QApplication>
#include <QtWidgets/QLCDNumber>
#include <QTimer>
#include <QMessageBox>

#include <osgViewer/CompositeViewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgGA/MultiTouchTrackballManipulator>
#include <osgDB/ReadFile>
#include <osgQt/GraphicsWindowQt>
#include <osg/PolygonOffset>

class ActiveQTOSGWidget : public QWidget
{
public:
	ActiveQTOSGWidget(QWidget *parent = 0);
public:
	virtual void paintEvent(QPaintEvent* event)
	{
		// Update the camera
		QPainter paint(this);
		QPen pen;
		pen.setColor(QColor(255, 0, 0));
		QBrush brush(QColor(255, 0, 0));
		paint.setPen(pen);
		paint.setBrush(brush);
		int ss = width();
		paint.drawRect(0, 0, width(), height());
	}
};
#endif // OSGVIEW_H

#ifndef OSGACTIVEGLQT_H
#define OSGACTIVEGLQT_H
#include <iostream>

#include <QtWidgets/QWidget>
#include <ActiveQt/QAxBindable>
#include <QtWidgets/QLayout>
#include <QtWidgets/QApplication>
#include <QtWidgets/QLCDNumber>
#include <QTimer>
#include <QApplication>
#include <QDesktopWidget>
#include <QMessageBox>
#include <QPushButton>

#include "ui_osgactiveglqt.h"

#include "ActiveQTOSGWidget.h"

class osgActiveGLQT : public QWidget,public QAxBindable
{
	Q_OBJECT
public:
	osgActiveGLQT(QWidget *parent = 0);
private:
	Ui::osgActiveGLQTClass ui;
};

#endif // OSGACTIVEGLQT_H

hskoglund

Hmm it works for me, I tried with the hierarchyax sample and when I set WIDTH and HEIGHT in test.html:

..
<p>
This widget can have many children!
</p>
<object ID="ParentWidget" WIDTH = "900" HEIGHT = "600" CLASSID="CLSID:d574a747-8016-46db-a07c-b2b4854ee75c"
[Object not available! Did you forget to build and register the server?]
</object><br />
...

the ActiveQt window is set to 900x600:
Screenshot 2020-06-04 at 11.43.31.png

mirro

@hskoglund
oh~~ How to get the widget window from HWND in Qt5?

The following QT4 code

QWidget *myWidget;
HWND hwnd;
myWidget=QWidget::find(hwnd);

hskoglund

In Qt5 I think you have to step through all the QWidgets and look for a HWND match, like this:

QWidget *myWidget = nullptr;
HWND hwnd;

for (auto w : findChildren<QWidget*>())
    if (hwnd == (HWND) w->winId())
        myWidget = w;

mirro

Thank you very much.

How does the following lambda qt5 code translate into a normal slot for the singleshot in QT4?

 QTimer::singleShot(value * 1000,[this] { signalFromQt("Hello no.:" + QString::number(++i)); });

mrjj

@mirro
Qt4 does not support lambdas as far as i know as it must use the new connect syntax that came in Qt5.
So in Qt4 you have to use a normal slot for the singleshot.

mirro

@mrjj

How does the following lambda qt5 code translate into a normal slot for the singleshot in QT4?
[this] { signalFromQt("Hello no.:" + QString::number(++i)); }

mrjj

@mirro
QTimer::singleShot(0, this, SLOT(theslot()));

like any other slot

theslot must be in the class that is /this/
the i variable must be also be a class member of same class

mirro

@hskoglund
Start with C++ in Qt, emit a signal from there into IE11,Can it be implemented in QT4?

QTimer::singleShot(value * 1000,[this] { signalFromQt("Hello no.:" + QString::number(++i)); });

mrjj

@mirro
Hi
As told, Qt4 has no lamdas./ the new connect syntax.
so no you cannot use that syntax in Qt4.