QStyledItemDelegate from library

cultivation

Hi,

I am using a Subclass of QStyledItemDelegate named : EuroFormat. It is placed in a Library.
When using the EuroFormat i am getting a segmenation fault.

What am i doing wrong? can QStyledItemDelegate not be in another library?

Added an example. A executable with Dll.
"http://speedy.sh/ScUDg/TestApplication.zip":http://speedy.sh/ScUDg/TestApplication.zip "or dropbox":https://www.dropbox.com/s/1vlmiaccjkpnfyh/TestApplication.zip
Any help is appreciated, thanks.

francescmm

I'm currently using Delegates inside libraries, so its not the problem.

Could you post the code when the EuroFormat() is created and called?

cultivation

zip contains an example

Here the code from the example

@
*.pro

....

DEPENDPATH += . EuroFormat
INCLUDEPATH += EuroFormat
LIBS+= -LEuroFormat/release -lEuroFormat

....
@

@
main.cpp

#include "euroformat.h" //include from library

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

QTableView view;
QStandardItemModel model(1,1);
model.setData(model.index(0,0),10);
view.setModel(&model);
view.show();
QAbstractItemDelegate* del = new EuroFormat;

view.setItemDelegateForColumn(0, del);

return a.exec&#40;&#41;;
delete del;

}@

@
EuroFormat.h + cpp + global

#include <QtCore/qglobal.h>
#include <QStyledItemDelegate>

#if defined(EUROFORMAT_LIBRARY)

define EUROFORMATSHARED_EXPORT Q_DECL_EXPORT

#else

define EUROFORMATSHARED_EXPORT Q_DECL_IMPORT

#endif

class EUROFORMATSHARED_EXPORT EuroFormat : public QStyledItemDelegate
{
Q_OBJECT

public:
explicit EuroFormat(QObject *parent = 0) : QStyledItemDelegate(parent){}
virtual ~EuroFormat(){}

virtual QString displayText(const QVariant &value, const QLocale &locale) const {

return QString("€ %1").arg(locale.toString(value.toDouble(), 'f', 2));
}
};
@

francescmm

Yesterday I run your code and it compiles and runs a lot of times well. The problem is that some times it crashes when is executed a.exec(). With VisualStudio debugger it tells that the library was not well created.

I don't know why it doesn't work, today I'll take a look using the .lib to ensure that is not the delegate.

When I used the libraries with delegates I was done it with .lib not with .dll.

francescmm

I confirm that using .lib there is no problems!

cultivation

Someone else told me that the code works fine under Unix.

I am using Qt 5.0.1 under windows.

So the library is fine. what could be causing this?

wild guess: Is the delegation object created in another threat?

cultivation

sort of stack trace

UNADDRESSABLE ACCESS: reading 0x00000000-0x00000004 4 byte(s)
0 Qt5Gui.dll!ZNK22QGuiApplicationPrivate15isWindowBl ockedEP7QWindowPS1_ +0x51b (0x61955ddb <Qt5Gui.dll+0x15ddb>)
1 Qt5Gui.dll!ZN15QGuiApplication4fontEv +0x17 (0x619577b8 <Qt5Gui.dll+0x177b8>)
2 Qt5Gui.dll!ZN5QFontC1Ev +0x18 (0x619d9bd9 <Qt5Gui.dll+0x99bd9>)
3 Qt5Widgets.dll!ZN12QStyleOptionC2Eii +0x4b (0x11351b0c <Qt5Widgets.dll+0x61b0c>)
4 Qt5Widgets.dll!ZN20QStyleOptionViewItemC1ERKS_ +0x26 (0x11646987 <Qt5Widgets.dll+0x356987>)
5 Qt5Widgets.dll!ZNK19QStyledItemDelegate5paintEP8QP ainterRK20QStyleOptionViewItemRK11QModelIndex+0x1f (0x1157ee40 <Qt5Widgets.dll+0x28ee40>)
6 Qt5Widgetsd.dll!QTableView:aintEvent() [itemviews/qtableview.cpp:1439]
7 Qt5Widgetsd.dll!QWidget::event() [kernel/qwidget.cpp:7986]
8 Qt5Widgetsd.dll!QFrame::event() [widgets/qframe.cpp:534]
9 Qt5Widgetsd.dll!QAbstractScrollArea::viewportEvent () [widgets/qabstractscrollarea.cpp:1163]
10 Qt5Widgetsd.dll!QAbstractItemView::viewportEvent() [itemviews/qabstractitemview.cpp:1679]
11 Qt5Widgetsd.dll!QAbstractScrollAreaPrivate::viewpo rtEvent() [../../include/QtWidgets/5.0.1/QtWidgets/private/../../../../../src/widgets/widgets/qabstractscrollarea_p.h:105]
Note: instruction: mov (