Segmentation fault in setupUi() method

? This user is from outside of this forum

Hello everyone,

I'm experiencing a strange error with a dialog box. I designed the dialog box with QtDesigner and used multi-inheritance to code it's functionality. When I launch the dialog box, I receive a segmentation fault. The debugger indicates that it's this line which causes the error
@ label->setObjectName(QString::fromUtf8("label"));
@
which is in the setupUi() method of my dialog box.

And I have this message in the application output
@*** glibc detected *** /home/shiru/projects/app-build-desktop-release/bin/app: corrupted double-linked list: 0x0850e208 ***
@
followed by a backtrace
@======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x6b961)[0x1036961]
/lib/i386-linux-gnu/libc.so.6(+0x6e99c)[0x103999c]
/lib/i386-linux-gnu/libc.so.6(__libc_malloc+0x63)[0x103af53]
/usr/lib/libQtCore.so.4(_Z7qMallocj+0x1d)[0xc4db8d]
/usr/lib/libQtCore.so.4(_ZN7QStringC1EiN2Qt14InitializationE+0x2c)[0xc9a07c]
/usr/lib/libQtCore.so.4(+0x18bd7a)[0xd7ed7a]
/usr/lib/libQtCore.so.4(_ZN7QString8fromUtf8EPKci+0x43)[0xc9bf33]
/home/shiru/projects/app-build-desktop-release/plugins/libdsale.so(_ZN17Ui_MakeSaleDialog7setupUiEP7QDialog+0x1d8)[0x2d7b39e]
/home/shiru/projects/app-build-desktop-release/plugins/libdsale.so(_ZN14MakeSaleDialogC2EP7QWidget+0xb2)[0x2d796ca]
/home/shiru/projects/app-build-desktop-release/plugins/libdsale.so(_ZN14SaleMainWidget8makeSaleEv+0x33)[0x2d70ebf]
/home/shiru/projects/app-build-desktop-release/plugins/libdsale.so(_ZN14SaleMainWidget11qt_metacallEN11QMetaObject4CallEiPPv+0x8a)[0x2d8c114]
/usr/lib/libQtCore.so.4(_ZN11QMetaObject8metacallEP7QObjectNS_4CallEiPPv+0x3a)[0xd4e6ba]
....@

But sometimes, I have this in the application output
@*** glibc detected *** /home/shiru/projects/app-build-desktop-release/bin/app: realloc(): invalid old size: 0x08598a50 ***
@

And the debugger indicates another line in the setupUi() method

@priceSpinBox->setMinimum(1);
@

I don't understand this problem, can someone help me ?

I'm using Qt 4.7.2 on Ubuntu 11.04.

Thank you.

p-himik

Maybe these lines don't cause errors. Try to put some qDebug() around these lines and see your app's output.

lgeyer

Please provide a more complete example, especially code showing the call to setupUi(). Your memory most likely gets corrupted long before the code you've shown.

? This user is from outside of this forum

This is the complete code of my class

@#include "makesaledialog.h"

#include <QtCore/QDebug>
#include <QtCore/QDate>
#include <QtCore/QSettings>
#include <QtGui/QCloseEvent>
#include <QtGui/QCompleter>

#include <sale/sale.h>
#include <sale/sqlmodels/vendormodel.h>
#include <sale/sqlmodels/customermodel.h>
#include <sale/sqlmodels/salemodel.h>

#include <repository/repository.h>
#include <repository/repositoryproduct.h>
#include <repository/sqlmodels/repositorymodel.h>

#include <utils.h>

using namespace Px;

MakeSaleDialog::MakeSaleDialog(QWidget *parent) :
QDialog(parent)
{
setupUi(this);

saleOptionsGroupBox->setVisible(false);

readSettings();

initialise();

setupOptionsComboBoxes();
setupComboBoxes();
setupCompleter();

initialiseMemosAndList();

}

void MakeSaleDialog::initialise()
{
Sale::List list = Sale::fetchByQuery("WHERE sale_date = '" + QDate::currentDate().toString("dd/MM/yyyy") + "'");

saleNumberEdit->setText(QVariant(list.size() + 1).toString());

}

void MakeSaleDialog::setupOptionsComboBoxes()
{
QSettings settings;

RepositoryModel *repositoryModel = new RepositoryModel;
repositoryModel->select();

repositoryComboBox->setModel(repositoryModel);
repositoryComboBox->setModelColumn(Repository::NameColumn);

int defaultRepositoryID = settings.value("saleoptions/default_repository_id", 0).toInt();
Repository::Pointer repository = Repository::fetchByPrimaryKey(defaultRepositoryID);

if(repository->isValid())
    repositoryComboBox->setCurrentIndex(repositoryComboBox->findText(repository->name()));

SaleTypeModel *saleTypeModel = new SaleTypeModel;
saleTypeModel->select();

saleTypeComboBox->setModel(saleTypeModel);
saleTypeComboBox->setModelColumn(SaleType::NameColumn);

int defaultSaleTypeID = settings.value("saleoptions/default_sale_type_id", 0).toInt();
SaleType::Pointer saleType = SaleType::fetchByPrimaryKey(defaultSaleTypeID);

if(saleType->isValid())
    saleTypeComboBox->setCurrentIndex(saleTypeComboBox->findText(saleType->name()));

PaymentModeModel *paymentModeModel = new PaymentModeModel;
paymentModeModel->select();

paymentModeComboBox->setModel(paymentModeModel);
paymentModeComboBox->setModelColumn(PaymentMode::NameColumn);

int defaultPaymentModeID = settings.value("saleoptions/default_payment_mode_id", 0).toInt();
PaymentMode::Pointer paymentMode = PaymentMode::fetchByPrimaryKey(defaultPaymentModeID);

if(paymentMode->isValid())
    paymentModeComboBox->setCurrentIndex(paymentModeComboBox->findText(paymentMode->name()));

}

void MakeSaleDialog::setupComboBoxes()
{
VendorModel *vendorModel = new VendorModel;
vendorModel->select();

vendorComboBox->setModel(vendorModel);
vendorComboBox->setModelColumn(Vendor::NameColumn);

CustomerModel *customerModel = new CustomerModel;
customerModel->select();

customerComboBox->setModel(customerModel);
customerComboBox->setModelColumn(Customer::NameColumn);

}

void MakeSaleDialog::setupCompleter()
{
m_designationModel = new QStringListModel;
m_designationModel->setStringList(m_designationList);

QCompleter *designationCompleter = new QCompleter(this);
designationCompleter->setModel(m_designationModel);
designationCompleter->setCaseSensitivity(Qt::CaseInsensitive);

designationEdit->setCompleter(designationCompleter);

}

void MakeSaleDialog::initialiseMemosAndList()
{
QString repositoryName = repositoryComboBox->currentText();

Repository::Pointer repository = Repository::fetchFirstByQuery("WHERE repository_name = '" + repositoryName + "'");

if(repository->isValid())
{
    RepositoryProduct::List list = RepositoryProduct::fetchByQuery("WHERE repository_id = " + QVariant(repository->id()).toString());

    foreach(RepositoryProduct::Pointer repoProduct, list)
    {
        ProviderProduct::Pointer providerProduct = repoProduct->providerProduct();
        Product::Pointer product = providerProduct->coreProduct();

        QString designation = getProductDesignation(product);
        designation += providerProduct->provider()->name() + " / " + repoProduct->entryDateInStock().toString("dd/MM/yyyy")
                + " / " + repoProduct->expireDate().toString("dd/MM/yyyy");

        quantityMemo[designation] = repoProduct->quantity();
        priceMemo[designation] = providerProduct->price();

        qDebug() << designation;

        m_designationList << designation;
    }
}

}

QString MakeSaleDialog::getProductDesignation(Product::Pointer p)
{
QString name = p->name();
QString dosage = p->dosage()->name();
QString form = p->form()->name();
QString packaging = p->packaging()->name();

QString designation = name;

if(dosage != Product::UnAvailable)
    designation += " " + dosage;

if(form != Product::UnAvailable)
    designation += " " + form;

if(packaging != Product::UnAvailable)
    designation += " " + packaging;

return designation;

}

void MakeSaleDialog::changeEvent(QEvent *e)
{
QDialog::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
retranslateUi(this);
break;
default:
break;
}
}

void MakeSaleDialog::closeEvent(QCloseEvent *e)
{
writeSettings();
e->accept();
}

void MakeSaleDialog::readSettings()
{
QSettings settings;
resize(settings.value("makesaledialog/size", QSize(954, 693)).toSize());
}

void MakeSaleDialog::writeSettings()
{
QSettings settings;
settings.setValue("makesaledialog/size", size());
}@

andre

And the offending .ui file?