Difference in release and debug versions
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I have such code:
@ImageWidget::ImageWidget( QWidget * parent, const QString & filename ) : QWidget(parent)
{
m_imageLabel = new QLabel();
m_imageLabel->setBackgroundRole(QPalette::Base);
m_imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
m_imageLabel->setScaledContents(true);m_scrollArea = new QScrollArea(this);
m_scrollArea->setBackgroundRole(QPalette::Dark);
m_scrollArea->setWidget(m_imageLabel);QVBoxLayout * layout = new QVBoxLayout();
layout->addWidget(m_scrollArea);
setLayout(layout);setWindowTitle(filename);
resize(500, 400);// open file
m_image = QImage(filename);
if (m_image.isNull()) {
QMessageBox::information(this, tr("Warning"),
tr("Cannot load %1.").arg(filename));
return;
}m_imageLabel->setPixmap(QPixmap::fromImage(m_image));
m_scaleFactor = 1.0;
normalSize();m_pixelatorFlag = false;
//connect(parent->ui.actionPixelator, SIGNAL(triggered()), this, SLOT(pixelatorOn()));
m_difference = 20;
m_currentColor = Qt::black;
}@So when I run in debug I have m_image.isNull() = false, and program works correctle, but when making release and execute it on computer without Qt installed (I mean only my *.exe and core,gui dlls) m_image.isNull() = false. So m_image is QImage (not pointer), and filename gets here:
@void MainWnd::onOpen()
{
QStringList files = QFileDialog::getOpenFileNames(this, "Select one or more files to open", "", "Images (*.png *.bmp *.jpeg *.jpg)");for(int i = 0; i<files.count();i++)
createChildWindow(files.at(i));
}@Then :
@void MainWnd::createChildWindow(QString fileName)
{
ImageWidget * widget = new ImageWidget(this,fileName);
connect(widget,SIGNAL(colorSelected(const QString & , int, int)),m_prcPanel, SLOT(showColorCoord(const QString &, int, int)));
connect(m_prcPanel->m_difference,SIGNAL(valueChanged(int)),widget,SLOT(onChangeDifference(int)));QMdiSubWindow * window = m_area->addSubWindow(widget);
if (window) {
window->setAttribute(Qt::WA_DeleteOnClose, true);
m_area->setActiveSubWindow(qobject_cast<QMdiSubWindow *>--(widget));
widget->show();
}
}@ -
you can try do something like this:
@bool isError = true;
if(filename.isEmpty() == flase && QFile::exists(filename)){
m_image = QImage(filename);
if (m_image.isNull() == false)
isError = false;
}
if(isError){
QMessageBox::information(this, tr("Warning"),
tr("Cannot load %1.").arg(filename));
return;
}
}@