Detailed Description
The QPrinter class is a paint device that paints on a printer.
This device represents a series of pages of printed output, and is used in almost exactly the same way as other paint devices such as QWidget and QPixmap. A set of additional functions are provided to manage device-specific features, such as orientation and resolution, and to step through the pages in a document as it is generated.
When printing directly to a printer on Windows or Mac OS X, QPrinter uses the built-in printer drivers. On X11, QPrinter uses the Common Unix Printing System (CUPS) or the standard Unix lpr utility to send PostScript or PDF output to the printer. As an alternative, the printProgram() function can be used to specify the command or utility to use instead of the system default.
QPrinter supports a number of parameters, most of which can be changed by the end user through a print dialog. In general, QPrinter passes these functions onto the underlying QPrintEngine.
The most important parameters are:
setOrientation() tells QPrinter which page orientation to use.
setPageSize() tells QPrinter what page size to expect from the printer.
setResolution() tells QPrinter what resolution you wish the printer to provide, in dots per inch (DPI).
setFullPage() tells QPrinter whether you want to deal with the full page or just with the part the printer can draw on.
setNumCopies() tells QPrinter how many copies of the document it should print.
Many of these functions can only be called before the actual printing begins (i.e., before QPainter::begin() is called). This usually makes sense because, for example, it's not possible to change the number of copies when you are halfway through printing. There are also some settings that the user sets (through the printer dialog) and that applications are expected to obey. See QAbstractPrintDialog's documentation for more details.
When QPainter::begin() is called, the QPrinter it operates on is prepared for a new page, enabling the QPainter to be used immediately to paint the first page in a document. Once the first page has been painted, newPage() can be called to request a new blank page to paint on, or QPainter::end() can be called to finish printing. The second page and all following pages are prepared using a call to newPage() before they are painted.
The first page in a document does not need to be preceded by a call to newPage(). You only need to calling newPage() after QPainter::begin() if you need to insert a blank page at the beginning of a printed document. Similarly, calling newPage() after the last page in a document is painted will result in a trailing blank page appended to the end of the printed document.
If you want to abort the print job, abort() will try its best to stop printing. It may cancel the entire job or just part of it.
Since QPrinter can print to any QPrintEngine subclass, it is possible to extend printing support to cover new types of printing subsystem by subclassing QPrintEngine and reimplementing its interface.
See also QPrintDialog and Printing with Qt.
Linux窗口程序设计—Qt4精彩实例分析源码 （817个子文件） 
128-1.bmp 2KB 127-1.bmp 2KB
butterfly 34KB combine 60KB mainwidget.cpp 10KB cursor.cpp 7KB mainwidget.cpp 6KB histogramview.cpp 6KB imgprocessor.cpp 6KB palette.cpp 5KB fileinformation.cpp 5KB listalign.cpp 5KB drawer.cpp 4KB table.cpp 4KB httpclient.cpp 4KB eventfilter.cpp 4KB mapwidget.cpp 4KB messagebox.cpp 4KB tcpclient.cpp 4KB ftpclient.cpp 4KB fontset.cpp 4KB stringcodec.cpp 4KB mainwidget.cpp 4KB mainwindow.cpp 3KB inputdialog.cpp 3KB mainwindow.cpp 3KB mainwindow.cpp 3KB layoutdlg.cpp 3KB geometry.cpp 3KB mainwidget.cpp 3KB style.cpp 3KB baseinfo.cpp 3KB baseinfo.cpp 3KB pararw.cpp 3KB mainwidget.cpp 3KB extension.cpp 2KB standarddialogs.cpp 2KB mainwindow.cpp 2KB networkinformation.cpp 2KB keyevent.cpp 2KB mainwidget.cpp 2KB main.cpp 2KB painter.cpp 2KB progress.cpp 2KB configdialog.cpp 2KB stringlistmodel.cpp 2KB dragwidget.cpp 2KB paintarea.cpp 2KB settings.cpp 2KB mouseevent.cpp 2KB printimage.cpp 2KB paintarea.cpp 2KB fileviewer.cpp 2KB pictrans.cpp 2KB contact.cpp 2KB contact.cpp 2KB dragwidget.cpp 2KB butterfly.cpp 2KB drawwidget.cpp 2KB udpserver.cpp 1KB combodelegate.cpp 1KB mainwindow.cpp 1KB printtext.cpp 1KB toolbar.cpp 1KB datedelegate.cpp 1KB dockwindows.cpp 1KB udpclient.cpp 1KB tcpserver.cpp 1KB paintarea.cpp 1KB detail.cpp 1KB detail.cpp 1KB digiclock.cpp 1KB paintarea.cpp 1KB graphicsitem.cpp 1KB spindelegate.cpp 1KB svgwindow.cpp 1KB main.cpp 1KB server.cpp 1KB dragicon.cpp 1KB content.cpp 1KB main.cpp 1KB draglabel.cpp 1002B stack.cpp 986B main.cpp 956B fader.cpp 950B shapewidget.cpp 935B rubberband.cpp 879B main.cpp 857B mywidget.cpp 791B items.cpp 750B mainwindow.cpp 720B mywidget.cpp 678B tcpclientsocket.cpp 651B svgwidget.cpp 609B main.cpp 561B main.cpp 455B main.cpp 437B main.cpp 437B main.cpp 416B main.cpp 412B共 817 条
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