QPrinter printer; printer.setResolution(600);
QPrinter printer(QPrinter::HighResolution); printer.setResolution(1200);In this example, we create a QPrinter object with a default resolution of "HighResolution", and then set the resolution to 1200 DPI. Both of these examples use the QPrinter class from the Qt framework. The necessary package libraries for using this class would be the Qt libraries.