How to send an exception to the JavaScript context?

[jampy81]

I have a simple Qt 4.7 application that uses QtWebKit to display a HTML/JavaScript page. Using addToJavaScriptWindowObject() a few C++ functions are provided to the JavaScript environment.

Is there a way to raise an exception in the JavaScript context in certain situations when such an exported C++ function is called from JavaScript?

• Throwing a C++ exception, like { throw 123; }, simply crashes the Qt application
• Using @m_view->page()->mainFrame()->evaluateJavaScript("throw new Error('whatever');")@ I can throw an exception but apparently it is not being passed to the calling JavaScript context (i.e. just the eval() code itself is being aborted)

Looking at the source code I see methods like setException() and similar but apparently I need a JSContext or some other reference to the calling JavaScript context, but I have no clue how to get it (there is no such thing in QWebFrame although WebKit itself or QWebFramePrivate seem to have such a reference).

My final goal is that a JavaScript code like

@try {
specialBrowserObject.someFunction();
} catch (e) {
document . write("Exception: "+e.message);
}@

shows the exception created in C++ (specialBrowserObject being the object exposed via addToJavaScriptWindowObject()).

Any suggestions?