[Qt-interest] Memory issues with painter->drawText() (shiva sitamraju)
shiva sitamraju
shivaenigma at gmail.com
Tue May 19 12:53:47 CEST 2009
Hi Martin,
Thanks very much. I added
Qt::WA_DeleteOnClose flag and the memory usage is not coming down.
Attaching the updated code.
Thanks
On Tue, May 19, 2009 at 3:30 PM, <qt-interest-request at trolltech.com> wrote:
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> 1. Re: How the Qt-designer "Widget-Box" is developed. - Can I
> see the source code for the same! (Tiago Correia)
> 2. Memory issues with painter->drawText() (shiva sitamraju)
> 3. Doubt in qInstallMsgHandler (Ravi Krishna)
> 4. Re: Doubt in qInstallMsgHandler (Mohammed Sameer)
>
>
> ---------- Forwarded message ----------
> From: Tiago Correia <tiago at cnotinfor.pt>
> To: "qt-interest at trolltech.com" <qt-interest at trolltech.com>
> Date: Tue, 19 May 2009 09:25:34 +0100
> Subject: Re: [Qt-interest] How the Qt-designer "Widget-Box" is developed. -
> Can I see the source code for the same!
> Hi,
> The source code from QDesigner is available, in the folder
> <QT Dir>/tools/designer/src/
>
> On Tue, May 19, 2009 at 6:37 AM, Santhosh Y <santhosh at softjin.com> wrote:
>
>> Hi,
>>
>> Please find the attached file in which the Qt-Designer snapshot is shown.
>> In widget Box which is highlighted in red in the attached document,
>> "Layouts, Spacers, Buttons, Item Views" are in layout.
>>
>> How they developed this Widget Box, so that the underlying items having
>> such layout so that, each item can be expanded or collapsed.
>>
>> Please help me or suggest me where to find the code for the same.
>>
>> Is the source code for developing Qt-designer is available?
>>
>> --
>> ----------------------------------------------------
>> Y Santhosh Kumar
>> Senior Software Engineer
>> SoftJin Technologies Private Limited
>> Unit No. 102, Mobius Tower,
>> I Floor, SJR I - Park,
>> EPIP, White Field,
>> Bangalore - 560066, India
>> U : www.softjin.com
>> E : santhosh at softjin.com
>> T : +91-80-41779999
>> M : +91-9740535265
>> ----------------------------------------------------
>>
>>
>>
>> Business Disclaimer
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> ---------- Forwarded message ----------
> From: shiva sitamraju <shivaenigma at gmail.com>
> To: qt-interest at trolltech.com
> Date: Tue, 19 May 2009 14:16:24 +0530
> Subject: [Qt-interest] Memory issues with painter->drawText()
> Hi everyone,
>
> Here is my issue. Whenever i call painter->drawText (with some newlines in
> the text) the resident memory usage shoots up by around 10MB. Also to add to
> the problems, the memory is not released when I close the widget.
>
> I am attaching the code to test this problem. I create a widget with a
> pushbutton and on clicking the button I set a flag, due to which text is
> drawn in paintEvent.
>
> After the paintEvent starts painting text the resident memory (res shown in
> top) shoots up by around 10MB which is not released even after I close the
> widget. Virtual memory usage also shoots up by a large number(around 100MB)
> and is not reclaimed.
>
> I would be glad if someone can throw some insight on why this is happening.
>
> Thanks
> -Shiva
>
>
> ---------- Forwarded message ----------
> From: Ravi Krishna <ravik at softjin.com>
> To: qt-interest at trolltech.com
> Date: Tue, 19 May 2009 14:57:55 +0530
> Subject: [Qt-interest] Doubt in qInstallMsgHandler
> Hi,
> When I run my QT application I am getting the following error
> "QList: Out of Memory"
> on stdout when the message handler is not set.
>
> To catch all the fatal error messages I set qInstallMsgHandler to myMsgOut.
>
> void myMsgOut(QtMsgType type, const char *msg)
> {
> switch (type) {
> case QtCriticalMsg:
> std::cout << msg << std::endl;
> break;
> case QtFatalMsg:
> std::cout << msg << std::endl;
> QMessageBox::critical(NULL, "Fatal error", msg);
> break;
> default:
> std::cout << msg << std::endl;
> break;
> }
> }
>
> But after setting the message handler to myMsgOut, the application is
> crashing, without giving any output. I wanted to know is there any problem
> in my message handler function.
>
>
> Regards,
> Ravi krishna.M
>
>
>
> Business Disclaimer
> ____________________________________________________________
> This e-mail message and any files transmitted with it are intended solely
> for the use of the individual or entity to which they are addressed.
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> If you are not the intended recipient please be advised that you have
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> immediately delete it and all copies of it from your system, destroy any
> hard copies of it and notify the sender by return mail. You must
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> directly or indirectly, use, disclose, distribute, print, or copy any
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>
> ---------- Forwarded message ----------
> From: Mohammed Sameer <msameer at foolab.org>
> To: qt-interest at trolltech.com
> Date: Tue, 19 May 2009 12:30:41 +0300
> Subject: Re: [Qt-interest] Doubt in qInstallMsgHandler
> On Tue, May 19, 2009 at 02:57:55PM +0530, Ravi Krishna wrote:
> > Hi,
> > When I run my QT application I am getting the following error
> > "QList: Out of Memory"
> > on stdout when the message handler is not set.
> >
> > To catch all the fatal error messages I set qInstallMsgHandler to
> myMsgOut.
> >
> > void myMsgOut(QtMsgType type, const char *msg)
> > {
> > switch (type) {
> > case QtCriticalMsg:
> > std::cout << msg << std::endl;
> > break;
> > case QtFatalMsg:
> > std::cout << msg << std::endl;
> > QMessageBox::critical(NULL, "Fatal error", msg);
> > break;
> > default:
> > std::cout << msg << std::endl;
> > break;
> > }
> > }
> >
> > But after setting the message handler to myMsgOut, the application is
> > crashing, without giving any output. I wanted to know is there any
> > problem in my message handler function.
>
> I don't know the reason for the crash but if it's an out of memory
> condition then
> I guess you should not create new widgets because it'll probably fail (No
> memory) and if it
> fails because of an out of memory condition then it might end up calling
> your handler again
> ... and so on ;-)
>
> Just my 0.02
>
>
> Cheers,
>
> --
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