[Qt-creator] Strange difference when running with debug, as opposed to just running

Harri Pasanen harri at mpaja.com
Mon Jul 2 10:19:03 CEST 2012

As it happens, I can live without QML debugging, I'm hunting issues in  
C++ anyway.  Disabling QML debugging did the trick, thanks!

I'm on Linux, plus what I'm doing is rather compute heavy, so running on 
a device is something I try to avoid at this point.


On 07/02/2012 09:51 AM, kai.koehne at nokia.com wrote:
> The "Arrow with the bug in it" starts the application inside the Debugger. Unfortunately enabling QML debugging (checkbox in Run Settings of your project) breaks some Symbian components, so this is a known issue :( You can either decide to live with the effects, or disable QML debugging.
> (The technical reason is that the QML Debugger in Qt 4.x runs it's own event loop inside the GUI event loop. This however can change the order of events being delivered to the application, which somehow breaks the components. This has been fixed in Qt 5.0 by moving the QML debugger into it's own thread, but that of course doesn't help for the Symbian case).
> Hoe this helps,
> Kai
> PS: I'm not sure whether it makes a difference whether you let  your application run in the Simulator or on the device.
> ________________________________________
> From: qt-creator-bounces+kai.koehne=nokia.com at qt-project.org [qt-creator-bounces+kai.koehne=nokia.com at qt-project.org] on behalf of ext Harri Pasanen [harri at mpaja.com]
> Sent: Thursday, June 28, 2012 5:54 PM
> To: qt-creator at qt-project.org
> Subject: [Qt-creator] Strange difference when running with debug,       as opposed to just running
> I have some code that runs ok in Qt Simulator when launched from Qt
> Creator  by clicking on the green arrow head.
> But if I run it clicking the arrow head with a bug on it,  I see
> messages like
> file:///home/harri/QtSDK/Simulator/Qt/gcc/imports/com/nokia/symbian.1.1/ContextMenu.qml:89:
> Unable to assign QObject* to Popup_QMLTYPE_18*
> file:///home/harri/QtSDK/Simulator/Qt/gcc/imports/com/nokia/symbian.1.1/MenuContent.qml:64:
> TypeError: Result of expression 'containingPopup' [null] is not an object.
> and when the application comes up, the toolbar (ToolBarLayout) is empty,
> without any buttons.
> Similarly, running with valgrind memcheck, the toolbar is populated ok,
> and none of the above errors appear.
> I'm not sure exactly at what moment this started happening, might have
> been back when added the toolbar, as previous revision did not have
> any.   I don't run the debugger so often, so I did not notice until now.
> I don't have any breakpoints set.
> Kind of strange, any ideas?
> /Harri
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