Qt Charts: Access Violation exception
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Hi there having a weird problem with QtCharts. I was following the example from here: https://doc.qt.io/qt-5/qtcharts-linechart-example.html
but at the line where I declare
QChart *chart = new QChart();
It gives me the error:
Exception thrown at 0x00007FF87757B51C (Qt5Gui.dll) in QtChartTest2.exe: 0xC0000005: Access violation reading location 0x0000000000000000.
Which makes no sense to me. I isolated the line and it's seems that it is what is causing the error.
I am using Visual Studio Community 2017 on windows 10 and I have included in the project properties the Qt5Charts dependencies, which I have included, like here: https://forum.qt.io/topic/69915/qtcharts-causing-linking-errors-lnk2019/11.I ran the same example in QtCreator and I am not having the same issue.
I feel like I am missing something very obvious that I am missing.
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Hi there having a weird problem with QtCharts. I was following the example from here: https://doc.qt.io/qt-5/qtcharts-linechart-example.html
but at the line where I declare
QChart *chart = new QChart();
It gives me the error:
Exception thrown at 0x00007FF87757B51C (Qt5Gui.dll) in QtChartTest2.exe: 0xC0000005: Access violation reading location 0x0000000000000000.
Which makes no sense to me. I isolated the line and it's seems that it is what is causing the error.
I am using Visual Studio Community 2017 on windows 10 and I have included in the project properties the Qt5Charts dependencies, which I have included, like here: https://forum.qt.io/topic/69915/qtcharts-causing-linking-errors-lnk2019/11.I ran the same example in QtCreator and I am not having the same issue.
I feel like I am missing something very obvious that I am missing.
I don't know how is your implementation.
You're trying to access a NULL pointer.
Use static constructor instead, QChart chart(args);
Kind Regards,
Enrique Hdz
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Qt5Gui.dll!initPalette() Line 219 C++ Symbols loaded. Qt5Gui.dll!QGuiApplication::palette() Line 2961 C++ Symbols loaded. Qt5Widgets.dll!QApplication::palette(const char * className) Line 1400 C++ Symbols loaded. Qt5Widgets.dll!QWidgetTextControlPrivate::setContent(Qt::TextFormat format, const QString & text, QTextDocument * document) Line 437 C++ Symbols loaded. Qt5Widgets.dll!QWidgetTextControlPrivate::init(Qt::TextFormat format, const QString & text, QTextDocument * document) Line 417 C++ Symbols loaded. Qt5Widgets.dll!QWidgetTextControl::QWidgetTextControl(QObject * parent) Line 862 C++ Symbols loaded. Qt5Widgets.dll!QGraphicsTextItemPrivate::textControl() Line 10531 C++ Symbols loaded. Qt5Widgets.dll!QGraphicsTextItem::document() Line 10193 C++ Symbols loaded. Qt5Charts.dll!QtCharts::ChartTitle::ChartTitle(QGraphicsItem * parent) Line 42 C++ Symbols loaded. [Inline Frame] Qt5Charts.dll!QtCharts::ChartPresenter::createTitleItem() Line 241 C++ Symbols loaded. Qt5Charts.dll!QtCharts::ChartPresenter::setTitleFont(const QFont & font) Line 338 C++ Symbols loaded. Qt5Charts.dll!QtCharts::ChartThemeManager::decorateChart(QtCharts::QChart * chart, QtCharts::ChartTheme * theme) Line 107 C++ Symbols loaded. Qt5Charts.dll!QtCharts::ChartThemeManager::setTheme(QtCharts::QChart::ChartTheme theme) Line 87 C++ Symbols loaded. [Inline Frame] Qt5Charts.dll!QtCharts::QChart::setTheme(QtCharts::QChart::ChartTheme) Line 383 C++ Symbols loaded. [Inline Frame] Qt5Charts.dll!QtCharts::QChartPrivate::init() Line 876 C++ Symbols loaded. Qt5Charts.dll!QtCharts::QChart::QChart(QGraphicsItem * parent, QFlags<enum Qt::WindowType> wFlags) Line 250 C++ Symbols loaded. > QtChartTest2.exe!QtChartTest2::weightsHist() Line 30 C++ Symbols loaded. QtChartTest2.exe!QtChartTest2::qt_static_metacall(QObject * _o, QMetaObject::Call _c, int _id, void * * _a) Line 76 C++ Symbols loaded. Qt5Cored.dll!QMetaObject::activate(QObject * sender, int signalOffset, int local_signal_index, void * * argv) Line 3768 C++ Symbols loaded. Qt5Cored.dll!QMetaObject::activate(QObject * sender, const QMetaObject * m, int local_signal_index, void * * argv) Line 3629 C++ Symbols loaded. Qt5Widgetsd.dll!QAbstractButton::clicked(bool _t1) Line 310 C++ Symbols loaded. Qt5Widgetsd.dll!QAbstractButtonPrivate::emitClicked() Line 416 C++ Symbols loaded. Qt5Widgetsd.dll!QAbstractButtonPrivate::click() Line 408 C++ Symbols loaded. Qt5Widgetsd.dll!QAbstractButton::mouseReleaseEvent(QMouseEvent * e) Line 1011 C++ Symbols loaded. Qt5Widgetsd.dll!QWidget::event(QEvent * event) Line 8819 C++ Symbols loaded. Qt5Widgetsd.dll!QAbstractButton::event(QEvent * e) Line 969 C++ Symbols loaded. Qt5Widgetsd.dll!QPushButton::event(QEvent * e) Line 686 C++ Symbols loaded. Qt5Widgetsd.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3722 C++ Symbols loaded. Qt5Widgetsd.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 3198 C++ Symbols loaded. Qt5Cored.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1018 C++ Symbols loaded. Qt5Cored.dll!QCoreApplication::sendSpontaneousEvent(QObject * receiver, QEvent * event) Line 236 C++ Symbols loaded. Qt5Widgetsd.dll!QApplicationPrivate::sendMouseEvent(QWidget * receiver, QMouseEvent * event, QWidget * alienWidget, QWidget * nativeWidget, QWidget * * buttonDown, QPointer<QWidget> & lastMouseReceiver, bool spontaneous) Line 2702 C++ Symbols loaded. Qt5Widgetsd.dll!QWidgetWindow::handleMouseEvent(QMouseEvent * event) Line 623 C++ Symbols loaded. Qt5Widgetsd.dll!QWidgetWindow::event(QEvent * event) Line 244 C++ Symbols loaded. Qt5Widgetsd.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e) Line 3722 C++ Symbols loaded. Qt5Widgetsd.dll!QApplication::notify(QObject * receiver, QEvent * e) Line 3094 C++ Symbols loaded. Qt5Cored.dll!QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1018 C++ Symbols loaded. Qt5Cored.dll!QCoreApplication::sendSpontaneousEvent(QObject * receiver, QEvent * event) Line 236 C++ Symbols loaded. Qt5Guid.dll!QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent * e) Line 1950 C++ Symbols loaded. Qt5Guid.dll!QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent * e) Line 1734 C++ Symbols loaded. Qt5Guid.dll!QWindowSystemInterface::sendWindowSystemEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 945 C++ Symbols loaded. qwindowsd.dll!QWindowsGuiEventDispatcher::sendPostedEvents() Line 83 C++ Symbols loaded. Qt5Cored.dll!qt_internal_proc(HWND__ * hwnd, unsigned int message, unsigned __int64 wp, __int64 lp) Line 237 C++ Symbols loaded. [External Code] Annotated Frame Qt5Cored.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 628 C++ Symbols loaded. qwindowsd.dll!QWindowsGuiEventDispatcher::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 74 C++ Symbols loaded. Qt5Cored.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 135 C++ Symbols loaded. Qt5Cored.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 212 C++ Symbols loaded. Qt5Cored.dll!QCoreApplication::exec() Line 1291 C++ Symbols loaded. Qt5Guid.dll!QGuiApplication::exec() Line 1680 C++ Symbols loaded. Qt5Widgetsd.dll!QApplication::exec() Line 2911 C++ Symbols loaded. QtChartTest2.exe!main(int argc, char * * argv) Line 9 C++ Symbols loaded. QtChartTest2.exe!WinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, char * __formal, int __formal) Line 104 C++ Symbols loaded. [External Code] Annotated Frame -
can you post the content of
QtChartTest2::weightsHist()? and maybe tell us which line is line 30@VRonin
Sorry yeah, I should have been more clear.
WeightsHist is a method that is called by a button being clicked, that is meant to open a dialog with a hist chart. I was just testing the example from above out when I encountered the issue.void QtChartTest2::weightsHist()
{
QDialog *dialog = new QDialog(this);QLineSeries* series = new QLineSeries(); series->append(0, 6); series->append(2, 4); QHBoxLayout *chartLayout = new QHBoxLayout; dialog->setLayout(chartLayout); QChart *chart = new QChart(); chart->legend()->hide(); chart->addSeries(series); chart->createDefaultAxes(); chart->setTitle("Weights Histogram"); QChartView *chartView = new QChartView(chart); chartView->setRenderHint(QPainter::Antialiasing); chartLayout->addWidget(chartView); dialog->exec();}
Line 30 is QChart *chart = new QChart();
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Strange... what version of Qt are you running? are you using the MSVC2017 compiler in Qt creator too?
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In case anyone else falls into this error, i found the solution was that my Debug build in Visual studio was linked against QChart.lib, not QChartd.lib. Once i changed this it worked.
