QAxObject enables COM automation of Microsoft Excel on Windows. When an .xlsx file is opened by Excel, a hidden lock file named ~$.xlsx is created in the same directoyr. If this lock file is present, writing via QAxObject typically fails due to the workbook being read-only. Detecting and avoiding th...
Streaming XML in Qt with QXmlStreamReader and QXmlStreamWriter aligns with SAX-style processing: data is consumed sequentially without building an in-memory tree. Compared to the legacy DOM and SAX APIs, the streaming classes are lighter, faster for large documents, and still easy to use for both re...
Qt Custom Widget: Draggable Progress Ruler (QWidget + QPainter) A QWidget-based progress indicator that combines a filled progress track with a graduated ruler. The scale can be rendered on the top or bottom edge, supports click/drag positioning, integer or fractional labels, negative ranges, and op...
Installing linuxdeployqt Download the prebuilt AppImage for your architecture and place it on your PATH. Then make it executable and verify the version. chmod +x linuxdeployqt-x86_64.AppImage sudo mv linuxdeployqt-x86_64.AppImage /usr/local/bin/linuxdeployqt linuxdeployqt --version # Example output...
User interface uses QWidget as the top-level window, QLineEdit to show and edit the expression/result, and QPushButton for keypad input. Normalize user input as it’s typed to simplify later evaluation. Parentheses are tracked sothat a closing parenthesis is only allowed when a matching opening paren...