23 - QtPrintSupport - Qt PrintSupport module provides classes to make printing easier and portable
QAbstractPrintDialog - Base implementation for print dialogs used to configure printers
QPageSetupDialog - Configuration dialog for the page-related options on a printer
QPrintDialog - Dialog for specifying the printer‘s configuration
QPrintEngine - Defines an interface for how QPrinter interacts with a given printing subsystem
QPrintPreviewDialog - Dialog for previewing and configuring page layouts for printer output
QPrintPreviewWidget - Widget for previewing page layouts for printer output
QPrinter - Paint device that paints on a printer
QPrinterInfo - Gives access to information about existing printers
原文：http://www.cnblogs.com/stycpp-2016/p/6383010.html