QWebView, Google maps

[Viper666]

Hi everyone,
i need help i make browser and i found bug: connection:
connect(view, SIGNAL(loadStarted()), this, SLOT(loadStarted()));
slot loadStarted():

urlLine->RefreshButton()->setVisible(false);
urlLine->StopButton()->setVisible(true);
//progressbar->setVisible(true); when this isn't comment line it crash program i don't know why i try try, catch blocks, program has been crashed too
Thanks

[wysota]

Does "progressbar" point to a valid object? Where is the declaration and initialization of that object?

[Viper666]

Yes I have Widget- Browser in this widget is Url line search line actions(go Back, Forward...) and progress bar is in this widget and connection too

progressBar = new QProgressBar(this);
statusBar->addPermanentWidget(progressBar);

progressBar->setMaximumWidth(250);
progressBar->setMinimum(0);
progressBar->setMaximum(100);
progressBar->setValue(0);
And new tab is simple new Browser

[wysota]

Are you sure you are not shadowing a member variable with a local variable?

[Viper666]

Yes, but it do only in google maps when i try street view and when you are in google document try page and for example you type something in urlLine and load it never otherwise and

[Viper666]

pls help i don't know what do i can send code here if it help i try debug
0x678bb21f <+139579>:\tjmp 0x678bb1ed <ZrsR11QDataStreamR12QPaintBuffer+139529>\n"


>~" 0x678bb4df <+140283>:\tjmp 0x678bb3e3 <ZrsR11QDataStreamR12QPaintBuffer+140031>\n"
>~" 0x678bb4e4 <+140288>:\timul %edx,%eax\n"
>~" 0x678bb4e7 <+140291>:\tadd %eax,%ecx\n"
>~" 0x678bb4e9 <+140293>:\tmov %ecx,%eax\n"
>~" 0x678bb4eb <+140295>:\tsar $0x8,%eax\n"
>~" 0x678bb4ee <+140298>:\tlea 0x80(%ecx,%eax,1),%edx\n"
>~" 0x678bb4f5 <+140305>:\tsar $0x8,%edx\n"
>~" 0x678bb4f8 <+140308>:\tjmp 0x678bb38e <ZrsR11QDataStreamR12QPaintBuffer+139946>\n"
>~" 0x678bb4fd <+140313>:\tlea 0x0(%esi),%esi\n"
>~" 0x678bb500 <+140316>:\tadd $0x5c,%esp\n"
>~" 0x678bb503 <+140319>:\tpop %ebx\n"
>~" 0x678bb504 <+140320>:\tpop %esi\n"
>~" 0x678bb505 <+140321>:\tpop %edi\n"
>~" 0x678bb506 <+140322>:\tleave \n"
>~" 0x678bb507 <+140323>:\tret \n"
>~" 0x678bb508 <+140324>:\tmov %ecx,(%esp)\n"
>~" 0x678bb50b <+140327>:\tcall 0x67d1d7bc <Z6qAlphaj>\n"
>~" 0x678bb510 <+140332>:\tmov %eax,%esi\n"
>~" 0x678bb512 <+140334>:\tmov %ebx,(%esp)\n"
>~" 0x678bb515 <+140337>:\tcall 0x67d1d630 <Z4qRedj>\n"
>~" 0x678bb51a <+140342>:\tmov %eax,-0x30(%ebp)\n"
>~" 0x678bb51d <+140345>:\tmov %ebx,(%esp)\n"
>~" 0x678bb520 <+140348>:\tcall 0x67d1d7c8 <Z6qGreenj>\n"
>~" 0x678bb525 <+140353>:\tmov %eax,-0x34(%ebp)\n"
>~" 0x678bb528 <+140356>:\tmov %ebx,(%esp)\n"
>~" 0x678bb52b <+140359>:\tcall 0x67d1d66c <Z5qBluej>\n"
>~" 0x678bb530 <+140364>:\tmov %eax,-0x38(%ebp)\n"
>~" 0x678bb533 <+140367>:\tmov -0x3c(%ebp),%ecx\n"
>~" 0x678bb536 <+140370>:\ttest %ecx,%ecx\n"
>~" 0x678bb538 <+140372>:\tjle 0x678bb500 <ZrsR11QDataStreamR12QPaintBuffer+140316>\n"
>~" 0x678bb53a <+140374>:\tmov 0x8(%ebp),%eax\n"
>~" 0x678bb53d <+140377>:\tsub %esi,%eax\n"
>~" 0x678bb53f <+140379>:\tmov %eax,-0x20(%ebp)\n"
>~" 0x678bb542 <+140382>:\tmov -0x30(%ebp),%edx\n"
>~" 0x678bb545 <+140385>:\tshl %edx\n"
>~" 0x678bb547 <+140387>:\tmov %edx,-0x2c(%ebp)\n"
>~" 0x678bb54a <+140390>:\tmov -0x38(%ebp),%ecx\n"
>~" 0x678bb54d <+140393>:\tshl %ecx\n"
>~" 0x678bb54f <+140395>:\tmov %ecx,-0x28(%ebp)\n"
>~" 0x678bb552 <+140398>:\tmov -0x34(%ebp),%ebx\n"
>~" 0x678bb555 <+140401>:\tshl %ebx\n"
>~" 0x678bb557 <+140403>:\tmov %ebx,-0x1c(%ebp)\n"
>~" 0x678bb55a <+140406>:\tmov -0x34(%ebp),%eax\n"
>~" 0x678bb55d <+140409>:\tsub %esi,%eax\n"
>~" 0x678bb55f <+140411>:\tshl %eax\n"
>~" 0x678bb561 <+140413>:\tmov %eax,-0x40(%ebp)\n"
>~" 0x678bb564 <+140416>:\tmov -0x38(%ebp),%eax\n"
>~" 0x678bb567 <+140419>:\tsub %esi,%eax\n"
>~" 0x678bb569 <+140421>:\tshl %eax\n"
>~" 0x678bb56b <+140423>:\tmov %eax,-0x44(%ebp)\n"
>~" 0x678bb56e <+140426>:\tmov -0x30(%ebp),%eax\n"
>~" 0x678bb571 <+140429>:\tsub %esi,%eax\n"
>~" 0x678bb573 <+140431>:\tshl %eax\n"
>~" 0x678bb575 <+140433>:\tmov %eax,-0x48(%ebp)\n"
>~" 0x678bb578 <+140436>:\txor %edi,%edi\n"
>~" 0x678bb57a <+140438>:\tmov %esi,-0x14(%ebp)\n"
>~" 0x678bb57d <+140441>:\tjmp 0x678bb676 <ZrsR11QDataStreamR12QPaintBuffer+140690>\n"
>~" 0x678bb582 <+140446>:\txchg %ax,%ax\n"
>~" 0x678bb584 <+140448>:\tmov %ebx,%ecx\n"
>~" 0x678bb586 <+140450>:\tsub %eax,%ecx\n"
>~" 0x678bb588 <+140452>:\tmov -0x48(%ebp),%eax\n"
>~" 0x678bb58b <+140455>:\timul %ecx,%eax\n"
>~" 0x678bb58e <+140458>:\tmov -0x14(%ebp),%ecx\n"
>~" 0x678bb591 <+140461>:\timul %ebx,%ecx\n"
>~" 0x678bb594 <+140464>:\tadd %ecx,%eax\n"
>~" 0x678bb596 <+140466>:\tlea (%eax,%edx,1),%edx\n"
>~" 0x678bb599 <+140469>:\tmov %edx,%eax\n"
>~" 0x678bb59b <+140471>:\tsar $0x8,%eax\n"
>~" 0x678bb59e <+140474>:\tlea 0x80(%edx,%eax,1),%eax\n"
>~" 0x678bb5a5 <+140481>:\tsar $0x8,%eax\n"
>~" 0x678bb5a8 <+140484>:\tmov %eax,-0x18(%ebp)\n"
>~" 0x678bb5ab <+140487>:\tmov %esi,(%esp)\n"
>~" 0x678bb5ae <+140490>:\tcall 0x67d1d66c <Z5qBluej>\n"
>~" 0x678bb5b3 <+140495>:\tmov -0x20(%ebp),%ecx\n"
>~" 0x678bb5b6 <+140498>:\timul %eax,%ecx\n"
>~" 0x678bb5b9 <+140501>:\tmov -0x10(%ebp),%edx\n"
>~" 0x678bb5bc <+140504>:\timul -0x38(%ebp),%edx\n"
>~" 0x678bb5c0 <+140508>:\tadd %edx,%ecx\n"
>~" 0x678bb5c2 <+140510>:\tmov -0x28(%ebp),%edx\n"
>~" 0x678bb5c5 <+140513>:\tcmp %edx,-0x14(%ebp)\n"
>~" 0x678bb5c8 <+140516>:\tjg 0x678bb6dc <ZrsR11QDataStreamR12QPaintBuffer+140792>\n"
>~" 0x678bb5ce <+140522>:\tmov %ebx,%edx\n"
>~" 0x678bb5d0 <+140524>:\tsub %eax,%edx\n"
>~" 0x678bb5d2 <+140526>:\tmov -0x44(%ebp),%eax\n"
>~" 0x678bb5d5 <+140529>:\timul %edx,%eax\n"
>~" 0x678bb5d8 <+140532>:\tmov -0x14(%ebp),%edx\n"
>~" 0x678bb5db <+140535>:\timul %ebx,%edx\n"
>~" 0x678bb5de <+140538>:\tadd %edx,%eax\n"
>~" 0x678bb5e0 <+140540>:\tlea (%eax,%ecx,1),%ecx\n"
>~" 0x678bb5e3 <+140543>:\tmov %ecx,%eax\n"
>~" 0x678bb5e5 <+140545>:\tsar $0x8,%eax\n"
>~" 0x678bb5e8 <+140548>:\tlea 0x80(%ecx,%eax,1),%edx\n"
>~" 0x678bb5ef <+140555>:\tsar $0x8,%edx\n"
>~" 0x678bb5f2 <+140558>:\tmov %esi,(%esp)\n"
>~" 0x678bb5f5 <+140561>:\tmov %edx,-0x58(%ebp)\n"
>~" 0x678bb5f8 <+140564>:\tcall 0x67d1d7c8 <Z6qGreenj>\n"
>~" 0x678bb5fd <+140569>:\tmov -0x20(%ebp),%esi\n"
>~" 0x678bb600 <+140572>:\timul %eax,%esi\n"
>~" 0x678bb603 <+140575>:\tmov -0x10(%ebp),%ecx\n"
>~" 0x678bb606 <+140578>:\timul -0x34(%ebp),%ecx\n"
>~" 0x678bb60a <+140582>:\tlea (%esi,%ecx,1),%ecx\n"
>~" 0x678bb60d <+140585>:\tmov -0x1c(%ebp),%esi\n"
>~" 0x678bb610 <+140588>:\tcmp %esi,-0x14(%ebp)\n"
>~" 0x678bb613 <+140591>:\tmov -0x58(%ebp),%edx\n"
>~" 0x678bb616 <+140594>:\tjg 0x678bb6c0 <ZrsR11QDataStreamR12QPaintBuffer+140764>\n"
>~" 0x678bb61c <+140600>:\tmov %ebx,%esi\n"
>~" 0x678bb61e <+140602>:\tsub %eax,%esi\n"
>~" 0x678bb620 <+140604>:\tmov -0x40(%ebp),%eax\n"
>~" 0x678bb623 <+140607>:\timul %esi,%eax\n"
>~" 0x678bb626 <+140610>:\timul -0x14(%ebp),%ebx\n"
>~" 0x678bb62a <+140614>:\tadd %ebx,%eax\n"
>~" 0x678bb62c <+140616>:\tlea (%eax,%ecx,1),%ecx\n"
>~" 0x678bb62f <+140619>:\tmov %ecx,%eax\n"
>~" 0x678bb631 <+140621>:\tsar $0x8,%eax\n"
>~" 0x678bb634 <+140624>:\tlea 0x80(%ecx,%eax,1),%eax\n"
>~" 0x678bb63b <+140631>:\tsar $0x8,%eax\n"
>~" 0x678bb63e <+140634>:\tmov -0x10(%ebp),%ecx\n"
>~" 0x678bb641 <+140637>:\timul -0x20(%ebp),%ecx\n"
>~" 0x678bb645 <+140641>:\tsar $0x8,%ecx\n"
>~" 0x678bb648 <+140644>:\tmov $0xff,%ebx\n"
>~" 0x678bb64d <+140649>:\tsub %ecx,%ebx\n"
>~" 0x678bb64f <+140651>:\tmov %ebx,0xc(%esp)\n"
>~" 0x678bb653 <+140655>:\tmov %edx,0x8(%esp)\n"
>~" 0x678bb657 <+140659>:\tmov %eax,0x4(%esp)\n"
>~" 0x678bb65b <+140663>:\tmov -0x18(%ebp),%esi\n"
>~" 0x678bb65e <+140666>:\tmov %esi,(%esp)\n"
>~" 0x678bb661 <+140669>:\tcall 0x67d1d6f0 <Z5qRgbaiiii>\n"
>~" 0x678bb666 <+140674>:\tmov -0x24(%ebp),%edx\n"
>~" 0x678bb669 <+140677>:\tmov %eax,(%edx,%edi,4)\n"
>~" 0x678bb66c <+140680>:\tinc %edi\n"
>~" 0x678bb66d <+140681>:\tcmp -0x3c(%ebp),%edi\n"
>~" 0x678bb670 <+140684>:\tje 0x678bb500 <ZrsR11QDataStreamR12QPaintBuffer+140316>\n"
>~" 0x678bb676 <+140690>:\tmov -0x24(%ebp),%eax\n"
>~" 0x678bb679 <+140693>:\tmov (%eax,%edi,4),%esi\n"
>~" 0x678bb67c <+140696>:\tmov %esi,(%esp)\n"
>~" 0x678bb67f <+140699>:\tcall 0x67d1d7bc <Z6qAlphaj>\n"
>~" 0x678bb684 <+140704>:\tmov %eax,%ebx\n"
>~" 0x678bb686 <+140706>:\tmov %esi,(%esp)\n"
>~" 0x678bb689 <+140709>:\tcall 0x67d1d630 <Z4qRedj>\n"
>~" 0x678bb68e <+140714>:\tmov $0xff,%edx\n"
>~" 0x678bb693 <+140719>:\tsub %ebx,%edx\n"
>~" 0x678bb695 <+140721>:\tmov %edx,-0x10(%ebp)\n"
>~" 0x678bb698 <+140724>:\tmov -0x30(%ebp),%ecx\n"
>~" 0x678bb69b <+140727>:\timul %edx,%ecx\n"
>~" 0x678bb69e <+140730>:\tmov -0x20(%ebp),%edx\n"
>~" 0x678bb6a1 <+140733>:\timul %eax,%edx\n"
>~" 0x678bb6a4 <+140736>:\tlea (%ecx,%edx,1),%edx\n"
>~" 0x678bb6a7 <+140739>:\tmov -0x2c(%ebp),%ecx\n"
>~" 0x678bb6aa <+140742>:\tcmp %ecx,-0x14(%ebp)\n"
>~" 0x678bb6ad <+140745>:\tjle 0x678bb584 <ZrsR11QDataStreamR12QPaintBuffer+140448>\n"
>~" 0x678bb6b3 <+140751>:\timul %ecx,%eax\n"
>~" 0x678bb6b6 <+140754>:\tadd %eax,%edx\n"
>~" 0x678bb6b8 <+140756>:\tjmp 0x678bb599 <ZrsR11QDataStreamR12QPaintBuffer+140469>\n"
I see QPaintBuffer. Can crash cause overflow QPaintBuffer?
If can: what can i do?

[wysota]

Please prepare a minimal compilable example reproducing the problem.

[Viper666]

Widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QtGui>
#include <QtCore>
#include <QtWebKit>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
Q_OBJECT

public:
explicit Widget(QWidget *parent = 0);
~Widget();

private slots:
void loadStarted();
void loadFinished(bool ok);
void load(int progress);

private:
Ui::Widget *ui;
QVBoxLayout *layout;
QWebView *view;
QStatusBar *statusbar;
QProgressBar *bar;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
layout = new QVBoxLayout(this);
this->setLayout(layout);
view = new QWebView(this);
layout->addWidget(view);
statusbar = new QStatusBar(this);
layout->addWidget(statusbar);
bar = new QProgressBar(this);
statusbar->addPermanentWidget(bar);
view->settings()->setAttribute(QWebSettings::PluginsEnabled, true);
view->load(QUrl("http://google.com"));
connect(view, SIGNAL(loadStarted()), this, SLOT(loadStarted()));
connect(view, SIGNAL(loadFinished(bool)), this, SLOT(loadFinished(bool)));
connect(view, SIGNAL(loadProgress(int)), this, SLOT(load(int)));
}

Widget::~Widget()
{
delete ui;
}

void Widget::loadStarted()
{
bar->setVisible(true);
}

void Widget::loadFinished(bool ok)
{
bar->setVisible(false);
}

void Widget::load(int progress)
{
bar->setValue(progress);
}


Added after 40 minutes:

go google maps type for example washington DC and drag market and wait it will crash program

[Viper666]

Video : http://www.youtube.com/watch?v=TdSb6FEde0o

[ChrisW67]

After cutting out the (unused) Designer UI stuff the program does not fail here.

[Viper666]

Widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QtGui>
#include <QtCore>
#include <QtWebKit>



class Widget : public QWidget
{
Q_OBJECT

public:
explicit Widget(QWidget *parent = 0);
~Widget();

private slots:
void loadStarted();
void loadFinished(bool ok);
void load(int progress);

private:
// Ui::Widget *ui;
QVBoxLayout *layout;
QWebView *view;
QStatusBar *statusbar;
QProgressBar *bar;
};

#endif // WIDGET_H

Widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
QWidget(parent)
//ui(new Ui::Widget)
{
// ui->setupUi(this);
layout = new QVBoxLayout(this);
this->setLayout(layout);
view = new QWebView(this);
layout->addWidget(view);
statusbar = new QStatusBar(this);
layout->addWidget(statusbar);
bar = new QProgressBar(this);
statusbar->addPermanentWidget(bar);
view->settings()->setAttribute(QWebSettings::PluginsEnabled, true);
view->load(QUrl("http://google.com"));
connect(view, SIGNAL(loadStarted()), this, SLOT(loadStarted()));
connect(view, SIGNAL(loadFinished(bool)), this, SLOT(loadFinished(bool)));
connect(view, SIGNAL(loadProgress(int)), this, SLOT(load(int)));
}

Widget::~Widget()
{
//delete ui;
}

void Widget::loadStarted()
{
bar->setVisible(true);
}

void Widget::loadFinished(bool ok)
{
bar->setVisible(false);
}

void Widget::load(int progress)
{
bar->setValue(progress);
}

Ok i deleted it. prigram is crashed still

[ChrisW67]

Remove any plugins from the equation

[Viper666]

I don't quite understand what i must remove please example or thing that i must remove

[wysota]

I don't quite understand what i must remove please example or thing that i must remove


view->settings()->setAttribute(QWebSettings::PluginsEnabled, true);

[Viper666]

but now google mpas won't work and any flash app/pages too

[wysota]

Google Maps doesn't require any plugins.

As for "other apps", we're not dealing with "other apps" right now so let's isolate the problem with a minimalistic environment (e.g. let's reduce the possibility of a broken plugin kicking in and crashing your app).