Qt Forum
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search
    • Unsolved

    Update: Forum Guidelines & Code of Conduct

    Access Violation when using QWebPage

    Qt WebKit
    4
    7
    3483
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Z
      ZaQQQ last edited by

      Hi,
      I'm using QWebPage inside QState child class.
      QWebPage is created inside OnEntry() and deleted inside OnExit(). load method is called inside OnEntry().

      The problem is access violation error after calling load method but before loadFinished signal. This issue appears randomly after 4-10 state enters/exits.

      What am I doing wrong?

      Thanks.

      Env:
      MSVC2010
      Qt 4.7.2

      Violation Stack:
      @ msvcr100d.dll!cmpDWORD(const void * lhs, const void * rhs) + 0x1c bytes C
      msvcr100d.dll!unaligned_memcmp(const unsigned char * bLHS, const unsigned char * bRHS, unsigned int siz) + 0x1f bytes C
      msvcr100d.dll!memcmp(const void * lhs, const void * rhs, unsigned int siz) + 0x19c bytes C
      QtWebKitd4.dll!WebCore::setUpIterator(WebCore::TextBreakIterator & iterator, QTextBoundaryFinder::BoundaryType type, const wchar_t * string, int length) Line 59 + 0x3d bytes
      QtWebKitd4.dll!WebCore::lineBreakIterator(const wchar_t * string, int length) Line 89 + 0x14 bytes
      QtWebKitd4.dll!WebCore::nextBreakablePosition(const wchar_t * str, int pos, int len, bool treatNoBreakSpaceAsBreak) Line 120 + 0xd bytes
      QtWebKitd4.dll!WebCore::isBreakable(const wchar_t * str, int pos, int len, int & nextBreakable, bool breakNBSP) Line 33 + 0x16 bytes
      QtWebKitd4.dll!WebCore::RenderText::calcPrefWidths(int leadWidth, WTF::HashSet<WebCore::SimpleFontData const *,WTF::PtrHash<WebCore::SimpleFontData const *>,WTF::HashTraits<WebCore::SimpleFontData const *> > & fallbackFonts, WebCore::GlyphOverflow & glyphOverflow) Line 668 + 0x22 bytes
      QtWebKitd4.dll!WebCore::RenderText::calcPrefWidths(int leadWidth) Line 581
      QtWebKitd4.dll!WebCore::RenderText::trimmedPrefWidths(int leadWidth, int & beginMinW, bool & beginWS, int & endMinW, bool & endWS, bool & hasBreakableChar, bool & hasBreak, int & beginMaxW, int & endMaxW, int & minW, int & maxW, bool & stripFrontSpaces) Line 480
      QtWebKitd4.dll!WebCore::RenderBlock::calcInlinePrefWidths() Line 4287
      QtWebKitd4.dll!WebCore::RenderBlock::calcPrefWidths() Line 3966
      QtWebKitd4.dll!WebCore::RenderTableCell::calcPrefWidths() Line 133
      QtWebKitd4.dll!WebCore::AutoTableLayout::recalcColumn(int effCol) Line 85
      QtWebKitd4.dll!WebCore::AutoTableLayout::fullRecalc() Line 208 + 0xc bytes
      QtWebKitd4.dll!WebCore::AutoTableLayout::calcPrefWidths(int & minWidth, int & maxWidth) Line 248
      QtWebKitd4.dll!WebCore::RenderTable::calcPrefWidths() Line 539
      QtWebKitd4.dll!WebCore::RenderBox::minPrefWidth() Line 461
      QtWebKitd4.dll!WebCore::RenderTable::calcWidth() Line 206 + 0x1b bytes
      QtWebKitd4.dll!WebCore::RenderTable::layout() Line 254
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox * child, WebCore::RenderBlock::MarginInfo & marginInfo, int & previousFloatBottom, int & maxFloatBottom) Line 1364
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChildren(bool relayoutChildren, int & maxFloatBottom) Line 1304
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlock(bool relayoutChildren) Line 749
      QtWebKitd4.dll!WebCore::RenderBlock::layout() Line 674
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox * child, WebCore::RenderBlock::MarginInfo & marginInfo, int & previousFloatBottom, int & maxFloatBottom) Line 1364
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChildren(bool relayoutChildren, int & maxFloatBottom) Line 1304
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlock(bool relayoutChildren) Line 749
      QtWebKitd4.dll!WebCore::RenderBlock::layout() Line 674
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox * child, WebCore::RenderBlock::MarginInfo & marginInfo, int & previousFloatBottom, int & maxFloatBottom) Line 1364
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChildren(bool relayoutChildren, int & maxFloatBottom) Line 1304
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlock(bool relayoutChildren) Line 749
      QtWebKitd4.dll!WebCore::RenderBlock::layout() Line 674
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox * child, WebCore::RenderBlock::MarginInfo & marginInfo, int & previousFloatBottom, int & maxFloatBottom) Line 1364
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChildren(bool relayoutChildren, int & maxFloatBottom) Line 1304
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlock(bool relayoutChildren) Line 749
      QtWebKitd4.dll!WebCore::RenderBlock::layout() Line 674
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox * child, WebCore::RenderBlock::MarginInfo & marginInfo, int & previousFloatBottom, int & maxFloatBottom) Line 1364
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChildren(bool relayoutChildren, int & maxFloatBottom) Line 1304
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlock(bool relayoutChildren) Line 749
      QtWebKitd4.dll!WebCore::RenderBlock::layout() Line 674
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox * child, WebCore::RenderBlock::MarginInfo & marginInfo, int & previousFloatBottom, int & maxFloatBottom) Line 1364
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlockChildren(bool relayoutChildren, int & maxFloatBottom) Line 1304
      QtWebKitd4.dll!WebCore::RenderBlock::layoutBlock(bool relayoutChildren) Line 749
      QtWebKitd4.dll!WebCore::RenderBlock::layout() Line 674
      QtWebKitd4.dll!WebCore::RenderView::layout() Line 125
      QtWebKitd4.dll!WebCore::FrameView::layout(bool allowSubtree) Line 720
      QtWebKitd4.dll!WebCore::FrameView::layoutTimerFired(WebCore::TimerWebCore::FrameView * __formal) Line 1263
      QtWebKitd4.dll!WebCore::TimerWebCore::FrameView::fired() Line 98 + 0x1f bytes
      QtWebKitd4.dll!WebCore::ThreadTimers::sharedTimerFiredInternal() Line 115
      QtWebKitd4.dll!WebCore::ThreadTimers::sharedTimerFired() Line 91
      QtWebKitd4.dll!WebCore::SharedTimerQt::timerEvent(QTimerEvent * ev) Line 118
      QtCored4.dll!QObject::event(QEvent * e) Line 1176
      @

      1 Reply Last reply Reply Quote 0
      • Zlatomir
        Zlatomir last edited by

        Have you built Qt 4.7.2 with VS 2010 or are you using the VS2008 binaries? This types of errors can be caused by binary incompatibility between different versions of Visual Studio

        https://forum.qt.io/category/41/romanian

        1 Reply Last reply Reply Quote 0
        • Z
          ZaQQQ last edited by

          Qt was built from sources on VS2010.

          1 Reply Last reply Reply Quote 0
          • Z
            ZapB last edited by

            Is this a 32 or 64 bit build of Qt? If it is 64-bit have you applied the hotfix to stop VC generating broken code?

            Nokia Certified Qt Specialist
            Interested in hearing about Qt related work

            1 Reply Last reply Reply Quote 0
            • Z
              ZaQQQ last edited by

              It's 32 bit build. Some more info from WhenHit breakpoint for setUpIterator:
              signature (\src\3rdparty\webkit\WebCore\platform\text\qt\TextBreakIteratorQt.cpp):
              @TextBreakIterator* setUpIterator(TextBreakIterator& iterator, QTextBoundaryFinder::BoundaryType type, const UChar* string, int length)@

              @ITERATOR {length=187 string=0x05750c0c <Bad Ptr> } STRING 0x05b6ee2c "Copyright © 1995-2011 eBay Inc. All Rights Reserved. Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the eBay ﷽﷽ꮫꮫꮫꮫﻮ" LENGTH 187@

              1 Reply Last reply Reply Quote 0
              • K
                kling last edited by

                This is a bug in WebKit, it was fixed here: https://bugs.webkit.org/show_bug.cgi?id=55139

                1 Reply Last reply Reply Quote 0
                • Z
                  ZaQQQ last edited by

                  great! thanks!

                  1 Reply Last reply Reply Quote 0
                  • First post
                    Last post