P2: Important C++ code:
class Global : public QObject
{
Q_OBJECT
public slots:
QPixmap pixmap() const
{
QPixmap px(100, 100);
px.fill(Qt::red);
return px;
}
};
class WebView : public QWebView
{
Q_OBJECT
public:
WebView()
{
QObject::connect(page()->mainFrame(), SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(addJSObject()));
}
public slots:
void addJSObject()
{
page()->mainFrame()->addToJavaScriptWindowObject("global", &m_global);
}
private:
Global m_global;
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
WebView *view = new WebView;
view->load(QUrl::fromLocalFile(QApplication::applicationDirPath() + QDir::separator() + "screenshot.html"));
view->show();
return app.exec();
}
HTML page:
<!doctype html>
<html>
<head>
<script>
function go()
{
try {
var s = global.pixmap();
alert("Size: " + s.width + "x" + s.height + "\nType: " + s);
// CRASH
//for(var i in s)
//alert(i);
alert(s.toDataURL());
} catch(ex) {
alert("Exception: " + ex);
}
}
</script>
</head>
<body>
<button onClick="go()">Go</button>
</body>
</html>
Compile and run. Press "Go" button. Two messages will appear:
Size: 100x100
Type: [Qt Native Pixmap 100,100]
Exception: TypeError: undefined is not a function (evaluating 's.toDataURL()')