@Christian-Ehrlicher What do you mean really make sure? I call it inside the constructor of classes of my static libraries (if the class uses resources). In my GUI application I call it in main after the application class (QApplication in this case) is created and before the main window is created.

2nd UPDATE: Problem was by natural source. The light reflects from window into camera. 2nd problem was using file as buffer. I solved it by using grab image from QCameraViewFinder widget and send by memory.

@SGaist Thanks for the suggestion. Sorry for the very delayed reply. I tried few options as in the mentioned link. Adding the qrc path in the application's pro file worked. Thank you!!

@Devopia53 It works! , Thanks.

I got the answer. QDir directory = QFileDialog::getExistingDirectory(this, tr("Open Directory"),"/home", QFileDialog::ShowDirsOnly| QFileDialog::DontResolveSymlinks); auto listWidget_images = new QListWidget();//set listwidget to display images listWidget_images->setMinimumSize(1200,400); listWidget_images->setViewMode(QListWidget::IconMode); listWidget_images->setIconSize(QSize(320,240)); listWidget_images->setResizeMode(QListWidget::Adjust); for(const QFileInfo & finfo: directory.entryInfoList()){ ui->listWidget_dirs->addItem(finfo.absoluteFilePath()); } connect(ui->listWidget_dirs, & QListWidget::itemClicked,[listWidget_images,this](QListWidgetItem *item) { listWidget_images->show(); listWidget_images->clear(); QDir directory(item->text()); directory.setNameFilters({"*.png", "*.jpg"}); for(const QFileInfo & finfo: directory.entryInfoList()){ QListWidgetItem *item = new QListWidgetItem(QIcon(finfo.absoluteFilePath()), finfo.fileName()); listWidget_images->addItem(item); } });

@SGaist Thank you! Right now I am just looking around yet... I will read the introduction and I will be back for sure :)

Yes they do. The files you put in a qrc file are compiled in your project. Each file is translated to a text version so currently you are building a file that weights more than 12MB.

Thank you all. It finally worked.