The QPrinter class is a paint device that paints on a printer. 更多...
| 头： | #include <QPrinter> |
| qmake: | QT += printsupport |
| 继承： | QPagedPaintDevice |
注意： 此类的所有函数 可重入 .
| enum | ColorMode { Color, GrayScale } |
| enum | DuplexMode { DuplexNone, DuplexAuto, DuplexLongSide, DuplexShortSide } |
| enum | Orientation { Portrait, Landscape } |
| enum | OutputFormat { NativeFormat, PdfFormat } |
| enum | PageOrder { FirstPageFirst, LastPageFirst } |
| typedef | PaperSize |
| enum | PaperSource { Auto, Cassette, Envelope, EnvelopeManual, ..., LastPaperSource } |
| enum | PrintRange { AllPages, Selection, PageRange, CurrentPage } |
| enum | PrinterMode { ScreenResolution, PrinterResolution, HighResolution } |
| enum | PrinterState { Idle, Active, Aborted, Error } |
| enum | Unit { Millimeter, Point, Inch, Pica, ..., DevicePixel } |
| QPrinter (PrinterMode mode = ScreenResolution) | |
| QPrinter (const QPrinterInfo & printer , PrinterMode mode = ScreenResolution) | |
| ~QPrinter () | |
| bool | abort () |
| bool | collateCopies () const |
| ColorMode | colorMode () const |
| int | copyCount () const |
| QString | creator () const |
| QString | docName () const |
| DuplexMode | duplex () const |
| bool | fontEmbeddingEnabled () const |
| int | fromPage () const |
| bool | fullPage () const |
| bool | isValid () const |
| QString | outputFileName () const |
| OutputFormat | outputFormat () const |
| QPageLayout | pageLayout () const |
| PageOrder | pageOrder () const |
| QRectF | pageRect (Unit unit ) const |
| QRectF | paperRect (Unit unit ) const |
| PaperSource | paperSource () const |
| QPrintEngine * | printEngine () const |
| QString | printProgram () const |
| PrintRange | printRange () const |
| QString | printerName () const |
| QString | printerSelectionOption () const |
| PrinterState | printerState () const |
| int | resolution () const |
| void | setCollateCopies (bool collate ) |
| void | setColorMode (ColorMode newColorMode ) |
| void | setCopyCount (int count ) |
| void | setCreator (const QString & creator ) |
| void | setDocName (const QString & name ) |
| void | setDuplex (DuplexMode duplex ) |
| void | setFontEmbeddingEnabled (bool enable ) |
| void | setFromTo (int from , int to ) |
| void | setFullPage (bool fp ) |
| void | setOutputFileName (const QString & fileName ) |
| void | setOutputFormat (OutputFormat format ) |
| bool | setPageLayout (const QPageLayout & newLayout ) |
| bool | setPageMargins (const QMarginsF & margins ) |
| bool | setPageMargins (const QMarginsF & margins , QPageLayout::Unit units ) |
| void | setPageOrder (PageOrder pageOrder ) |
| bool | setPageOrientation (QPageLayout::Orientation orientation ) |
| bool | setPageSize (const QPageSize & pageSize ) |
| void | setPaperSource (PaperSource source ) |
| void | setPrintProgram (const QString & printProg ) |
| void | setPrintRange (PrintRange range ) |
| void | setPrinterName (const QString & name ) |
| void | setPrinterSelectionOption (const QString & option ) |
| void | setResolution (int dpi ) |
| QList<PaperSource> | supportedPaperSources () const |
| QList<int> | supportedResolutions () const |
| bool | supportsMultipleCopies () const |
| int | toPage () const |
| virtual bool | newPage () |
| virtual QPaintEngine * | paintEngine () const |
(obsolete)
virtual void
|
setMargins (const Margins & m ) |
(obsolete)
virtual void
|
setPageSize (PageSize newPageSize ) |
(obsolete)
virtual void
|
setPageSizeMM (const QSizeF & size ) |
| void | setEngines (QPrintEngine * printEngine , QPaintEngine * paintEngine ) |
The QPrinter class is a paint device that paints on a printer.
此设备表示一系列打印输出页面，且使用方式几乎准确如同其它描绘设备，譬如 QWidget and QPixmap 。提供了一组额外函数来管理特定设备特征，譬如：取向和分辨率，及在生成文档时遍历文档页面。
When printing directly to a printer on Windows or macOS, QPrinter uses the built-in printer drivers. On X11, QPrinter 使用 CUPS (公共 Unix 打印系统) to send 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.
Note that setting parameters like paper size and resolution on an invalid printer is undefined. You can use QPrinter::isValid () to verify this before changing any parameters.
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 .
最重要参数：
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.
当 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.
由于 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.
另请参阅 QPrintDialog and Qt Print Support .
This enum type is used to indicate whether QPrinter should print in color or not.
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::Color
|
1
|
print in color if available, otherwise in grayscale. |
QPrinter::GrayScale
|
0
|
print in grayscale, even on color printers. |
This enum is used to indicate whether printing will occur on one or both sides of each sheet of paper (simplex or duplex printing).
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::DuplexNone
|
0
|
Single sided (simplex) printing only. |
QPrinter::DuplexAuto
|
1
|
The printer's default setting is used to determine whether duplex printing is used. |
QPrinter::DuplexLongSide
|
2
|
Both sides of each sheet of paper are used for printing. The paper is turned over its longest edge before the second side is printed |
QPrinter::DuplexShortSide
|
3
|
Both sides of each sheet of paper are used for printing. The paper is turned over its shortest edge before the second side is printed |
该枚举在 Qt 4.4 引入或被修改。
This enum type (not to be confused with
取向
) is used to specify each page's orientation.
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::Portrait
|
0
|
the page's height is greater than its width. |
QPrinter::Landscape
|
1
|
the page's width is greater than its height. |
This type interacts with QPrinter::PaperSize and QPrinter::setFullPage () to determine the final size of the page available to the application.
The OutputFormat enum is used to describe the format QPrinter should use for printing.
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::NativeFormat
|
0
|
QPrinter will print output using a method defined by the platform it is running on. This mode is the default when printing directly to a printer. |
QPrinter::PdfFormat
|
1
|
QPrinter will generate its output as a searchable PDF file. This mode is the default when printing to a file. |
另请参阅 outputFormat (), setOutputFormat ()，和 setOutputFileName ().
This enum type is used by QPrinter to tell the application program how to print.
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::FirstPageFirst
|
0
|
the lowest-numbered page should be printed first. |
QPrinter::LastPageFirst
|
1
|
the highest-numbered page should be printed first. |
typdef for the enum QPagedPaintDevice::PageSize .
This enum type specifies what paper size QPrinter should use. QPrinter does not check that the paper size is available; it just uses this information, together with QPrinter::Orientation and QPrinter::setFullPage (), to determine the printable area.
The defined sizes (with setFullPage (true)) are found in QPagedPaintDevice .
采用 setFullPage (false) (the default), the metrics will be a bit smaller; how much depends on the printer in use.
Due to historic reasons QPageSize::Executive is not the same as the standard Postscript and Windows Executive size, use QPageSize::ExecutiveStandard 代替。
The Postscript standard size QPageSize::Folio is different to the Windows DMPAPER_FOLIO size, use the Postscript standard size QPageSize::FanFoldGermanLegal if needed.
This typedef was introduced in Qt 4.4.
This enum type specifies what paper source QPrinter is to use. QPrinter does not check that the paper source is available; it just uses this information to try and set the paper source. Whether it will set the paper source depends on whether the printer has that particular source.
警告： This is currently only implemented for Windows.
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::Auto
|
6
|
|
QPrinter::Cassette
|
11
|
|
QPrinter::Envelope
|
4
|
|
QPrinter::EnvelopeManual
|
5
|
|
QPrinter::FormSource
|
12
|
|
QPrinter::LargeCapacity
|
10
|
|
QPrinter::LargeFormat
|
9
|
|
QPrinter::Lower
|
1
|
|
QPrinter::MaxPageSource
|
13
|
Deprecated, use LastPaperSource instead |
QPrinter::Middle
|
2
|
|
QPrinter::Manual
|
3
|
|
QPrinter::OnlyOne
|
0
|
|
QPrinter::Tractor
|
7
|
|
QPrinter::SmallFormat
|
8
|
|
QPrinter::Upper
|
OnlyOne
|
|
QPrinter::CustomSource
|
14
|
A PaperSource defined by the printer that is unknown to Qt |
QPrinter::LastPaperSource
|
CustomSource
|
The highest valid PaperSource value, currently CustomSource |
用于指定打印范围选定选项。
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::AllPages
|
0
|
应打印所有页面。 |
QPrinter::Selection
|
1
|
Only the selection should be printed. |
QPrinter::PageRange
|
2
|
The specified page range should be printed. |
QPrinter::CurrentPage
|
3
|
Only the current page should be printed. |
另请参阅 setPrintRange (), printRange ()，和 QAbstractPrintDialog::PrintRange .
This enum describes the mode the printer should work in. It basically presets a certain resolution and working mode.
| 常量 | 值 | 描述 |
|---|---|---|
QPrinter::ScreenResolution
|
0
|
Sets the resolution of the print device to the screen resolution. This has the big advantage that the results obtained when painting on the printer will match more or less exactly the visible output on the screen. It is the easiest to use, as font metrics on the screen and on the printer are the same. This is the default value. ScreenResolution will produce a lower quality output than HighResolution and should only be used for drafts. |
QPrinter::PrinterResolution
|
1
|
This value is deprecated. It is equivalent to ScreenResolution on Unix and HighResolution on Windows and Mac. Due to the difference between ScreenResolution and HighResolution, use of this value may lead to non-portable printer code. |
QPrinter::HighResolution
|
2
|
On Windows, sets the printer resolution to that defined for the printer in use. For PDF printing, sets the resolution of the PDF driver to 1200 dpi. |
注意： When rendering text on a QPrinter device, it is important to realize that the size of text, when specified in points, is independent of the resolution specified for the device itself. Therefore, it may be useful to specify the font size in pixels when combining text with graphics to ensure that their relative sizes are what you expect.
| 常量 | 值 |
|---|---|
QPrinter::Idle
|
0
|
QPrinter::Active
|
1
|
QPrinter::Aborted
|
2
|
QPrinter::Error
|
3
|
This enum type is used to specify the measurement unit for page and paper sizes.
| 常量 | 值 |
|---|---|
QPrinter::Millimeter
|
0
|
QPrinter::Point
|
1
|
QPrinter::Inch
|
2
|
QPrinter::Pica
|
3
|
QPrinter::Didot
|
4
|
QPrinter::Cicero
|
5
|
QPrinter::DevicePixel
|
6
|
Note the difference between Point and DevicePixel. The Point unit is defined to be 1/72th of an inch, while the DevicePixel unit is resolution dependant and is based on the actual pixels, or dots, on the printer.
该枚举在 Qt 4.4 引入或被修改。
创建新的打印机对象采用给定 mode .
创建新的打印机对象采用给定 printer and mode .
该函数在 Qt 4.4 引入。
Destroys the printer object and frees any allocated resources. If the printer is destroyed while a print job is in progress this may or may not affect the print job.
中止当前打印运行。返回
true
if the print run was successfully aborted and
printerState
() 会返回
QPrinter::Aborted
；否则返回
false
.
It is not always possible to abort a print job. For example, all the data has gone to the printer but the printer cannot or will not cancel the job when asked to.
返回
true
if collation is turned on when multiple copies is selected. Returns
false
if it is turned off when multiple copies is selected. When collating is turned off the printing of each individual page will be repeated the numCopies() amount before the next page is started. With collating turned on all pages are printed before the next copy of those pages is started.
该函数在 Qt 4.1 引入。
另请参阅 setCollateCopies ().
返回当前颜色模式。
另请参阅 setColorMode ().
Returns the number of copies that will be printed. The default value is 1.
该函数在 Qt 4.7 引入。
另请参阅 setCopyCount () 和 supportsMultipleCopies ().
Returns the name of the application that created the document.
另请参阅 setCreator ().
返回文档名称。
另请参阅 setDocName () 和 QPrintEngine::PrintEnginePropertyKey .
返回当前双工模式。
该函数在 Qt 4.4 引入。
另请参阅 setDuplex ().
返回
true
if font embedding is enabled.
该函数在 Qt 4.1 引入。
另请参阅 setFontEmbeddingEnabled ().
Returns the number of the first page in a range of pages to be printed (the "from page" setting). Pages in a document are numbered according to the convention that the first page is page 1.
By default, this function returns a special value of 0, meaning that the "from page" setting is unset.
注意： If fromPage() and toPage () both return 0, this indicates that the whole document will be printed .
该函数在 Qt 4.1 引入。
另请参阅 setFromTo () 和 toPage ().
返回
true
if the origin of the printer's coordinate system is at the corner of the page and false if it is at the edge of the printable area.
见 setFullPage () for details and caveats.
另请参阅 setFullPage () 和 pageLayout ().
返回
true
if the printer currently selected is a valid printer in the system, or a pure PDF printer; otherwise returns
false
.
To detect other failures check the output of QPainter::begin () 或 QPrinter::newPage ().
QPrinter printer;
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setOutputFileName("/foobar/nonwritable.pdf");
QPainter painter;
if (! painter.begin(&printer)) { // failed to open file
qWarning("failed to open file, is it writable?");
return 1;
}
painter.drawText(10, 10, "Test");
if (! printer.newPage()) {
qWarning("failed in flushing page to disk, disk full?");
return 1;
}
painter.drawText(10, 10, "Test 2");
painter.end();
该函数在 Qt 4.4 引入。
另请参阅 setPrinterName ().
[虚拟]
bool
QPrinter::
newPage
()
重实现自 QPagedPaintDevice::newPage ().
Tells the printer to eject the current page and to continue printing on a new page. Returns
true
if this was successful; otherwise returns
false
.
Calling newPage() on an inactive QPrinter object will always fail.
Returns the name of the output file. By default, this is an empty string (indicating that the printer shouldn't print to file).
另请参阅 setOutputFileName () 和 QPrintEngine::PrintEnginePropertyKey .
Returns the output format for this printer.
该函数在 Qt 4.1 引入。
另请参阅 setOutputFormat ().
返回当前页面的布局。使用此方法以访问当前 QPageSize , QPageLayout::Orientation , QMarginsF , fullPageRect() and paintRect().
Note that you cannot use the setters on the returned object, you must either call the QPrinter methods or setPageLayout ().
该函数在 Qt 5.3 引入。
另请参阅 setPageLayout (), setPageSize (), setPageOrientation ()，和 setPageMargins ().
返回当前页面次序。
The default page order is
FirstPageFirst
.
另请参阅 setPageOrder ().
Returns the page's rectangle in unit ; this is usually smaller than the paperRect() since the page normally has margins between its borders and the paper.
该函数在 Qt 4.4 引入。
另请参阅 paperSize ().
[虚拟]
QPaintEngine
*QPrinter::
paintEngine
() const
重实现自 QPaintDevice::paintEngine ().
Returns the paint engine used by the printer.
Returns the paper's rectangle in unit ; this is usually larger than the pageRect().
该函数在 Qt 4.4 引入。
另请参阅 pageRect ().
Returns the printer's paper source. This is
Manual
or a printer tray or paper cassette.
另请参阅 setPaperSource ().
Returns the print engine used by the printer.
该函数在 Qt 4.1 引入。
Returns the name of the program that sends the print output to the printer.
The default is to return an empty string; meaning that QPrinter will try to be smart in a system-dependent way. On X11 only, you can set it to something different to use a specific print program. On the other platforms, this returns an empty string.
另请参阅 setPrintProgram () 和 setPrinterSelectionOption ().
Returns the page range of the QPrinter . After the print setup dialog has been opened, this function returns the value selected by the user.
该函数在 Qt 4.1 引入。
另请参阅 setPrintRange ().
Returns the printer name. This value is initially set to the name of the default printer.
另请参阅 setPrinterName ().
Returns the printer options selection string. This is useful only if the print command has been explicitly set.
The default value (an empty string) implies that the printer should be selected in a system-dependent manner.
Any other value implies that the given value should be used.
This function always returns an empty string on Windows and Mac.
另请参阅 setPrinterSelectionOption () 和 setPrintProgram ().
Returns the current state of the printer. This may not always be accurate (for example if the printer doesn't have the capability of reporting its state to the operating system).
Returns the current assumed resolution of the printer, as set by setResolution () or by the printer driver.
另请参阅 setResolution ().
Sets the default value for collation checkbox when the print dialog appears. If collate is true, it will enable setCollateCopiesEnabled(). The default value is false. This value will be changed by what the user presses in the print dialog.
该函数在 Qt 4.1 引入。
另请参阅 collateCopies ().
Sets the printer's color mode to
newColorMode
, which can be either
Color
or
GrayScale
.
另请参阅 colorMode ().
Sets the number of copies to be printed to count .
The printer driver reads this setting and prints the specified number of copies.
该函数在 Qt 4.7 引入。
另请参阅 copyCount () 和 supportsMultipleCopies ().
Sets the name of the application that created the document to creator .
This function is only applicable to the X11 version of Qt. If no creator name is specified, the creator will be set to "Qt" followed by some version number.
另请参阅 creator ().
Sets the document name to name .
On X11, the document name is for example used as the default output filename in QPrintDialog . Note that the document name does not affect the file name if the printer is printing to a file. Use the setOutputFile() function for this.
另请参阅 docName () 和 QPrintEngine::PrintEnginePropertyKey .
Enables double sided printing based on the duplex 模式。
该函数在 Qt 4.4 引入。
另请参阅 duplex ().
[protected]
void
QPrinter::
setEngines
(
QPrintEngine
*
printEngine
,
QPaintEngine
*
paintEngine
)
This function is used by subclasses of QPrinter to specify custom print and paint engines ( printEngine and paintEngine , respectively).
QPrinter does not take ownership of the engines, so you need to manage these engine instances yourself.
Note that changing the engines will reset the printer state and all its properties.
该函数在 Qt 4.1 引入。
另请参阅 printEngine (), paintEngine ()，和 setOutputFormat ().
Enabled or disables font embedding depending on enable .
该函数在 Qt 4.1 引入。
另请参阅 fontEmbeddingEnabled ().
Sets the range of pages to be printed to cover the pages with numbers specified by from and to ，其中 from corresponds to the first page in the range and to corresponds to the last.
注意： Pages in a document are numbered according to the convention that the first page is page 1. However, if from and to are both set to 0, the whole document will be printed .
This function is mostly used to set a default value that the user can override in the print dialog when you call setup().
该函数在 Qt 4.1 引入。
若 fp is true, enables support for painting over the entire page; otherwise restricts painting to the printable area reported by the device.
By default, full page printing is disabled. In this case, the origin of the QPrinter 's coordinate system coincides with the top-left corner of the printable area.
If full page printing is enabled, the origin of the QPrinter 's coordinate system coincides with the top-left corner of the paper itself. In this case, the device metrics will report the exact same dimensions as indicated by PaperSize . It may not be possible to print on the entire physical page because of the printer's margins, so the application must account for the margins itself.
另请参阅 fullPage (), pageLayout (), setPageSize (), width ()，和 height ().
Sets the name of the output file to fileName .
Setting a null or empty name (0 or "") disables printing to a file. Setting a non-empty name enables printing to a file.
This can change the value of outputFormat (). If the file name has the ".pdf" suffix PDF is generated. If the file name has a suffix other than ".pdf", the output format used is the one set with setOutputFormat ().
QPrinter uses Qt's cross-platform PDF print engines respectively. If you can produce this format natively, for example macOS can generate PDF's from its print engine, set the output format back to NativeFormat .
另请参阅 outputFileName () 和 setOutputFormat ().
Sets the output format for this printer to format .
若 format 与目前设置的值相同，则不会有任何改变。
若 format is NativeFormat 那么 printerName will be set to the default printer. If there are no valid printers configured then no change will be made. If you want to set NativeFormat 采用特有 printerName then use setPrinterName ().
该函数在 Qt 4.1 引入。
另请参阅 outputFormat () 和 setPrinterName ().
将页面布局设为 newLayout .
若 newLayout is not valid for the current printer then the page layout will not be changed. For example, if the page size is not supported by the printer, or if the margins fall outside the printable area.
返回 true 若页面布局被成功设为 newLayout .
该函数在 Qt 5.3 引入。
另请参阅 pageLayout (), setPageSize (), setPageOrientation ()，和 setPageMargins ().
Set the page margins to
margins
using the current units. Returns
true
if the page margins were set successfully.
另请参阅 pageLayout () 和 setPageLayout ().
Set the page margins to margins 以给定 units 。若 units are not provided then the current units are used.
If in Full Page mode then no check is performed on the margins set, otherwise the margins must fall within the printable area for the page size on the current printer.
To obtain the current page margins use pageLayout ().pageMargins().
返回
true
if the page margins was successfully set to
margins
.
该函数在 Qt 5.3 引入。
另请参阅 pageLayout () 和 setPageLayout ().
Sets the page order to pageOrder .
The page order can be QPrinter::FirstPageFirst or QPrinter::LastPageFirst . The application is responsible for reading the page order and printing accordingly.
This function is mostly useful for setting a default value that the user can override in the print dialog.
This function is only supported under X11.
另请参阅 pageOrder ().
设置页面 orientation to QPageLayout::Portrait or QPageLayout::Landscape .
The printer driver reads this setting and prints the page using the specified orientation.
On Windows and Mac, this option can be changed while printing and will take effect from the next call to newPage ().
To obtain the current QPageLayout::Orientation 使用 pageLayout ().pageOrientation().
返回 true 若页面取向被成功设为 orientation .
该函数在 Qt 5.3 引入。
另请参阅 pageLayout () 和 setPageLayout ().
将页面大小设为 pageSize .
若 pageSize is not valid for the current printer then the page size will not be changed.
Changing the page size may affect the current page margins if they fall outside the printable margins for the new page size on the current printer.
To obtain the current QPageSize 使用 pageLayout ().pageSize().
返回 true 若页面大小被成功设为 pageSize .
该函数在 Qt 5.3 引入。
另请参阅 pageSize (), pageLayout ()，和 setPageLayout ().
Sets the paper source setting to source .
Windows only: This option can be changed while printing and will take effect from the next call to newPage ()
另请参阅 paperSource ().
Sets the name of the program that should do the print job to printProg .
On X11, this function sets the program to call with the PDF output. On other platforms, it has no effect.
另请参阅 printProgram ().
Sets the print range option in to be range .
该函数在 Qt 4.1 引入。
另请参阅 printRange ().
Sets the printer name to name .
若 name is empty then the output format will be set to PdfFormat .
若 name is not a valid printer then no change will be made.
若 name is a valid printer then the output format will be set to NativeFormat .
另请参阅 printerName (), isValid ()，和 setOutputFormat ().
Sets the printer to use option to select the printer. option is null by default (which implies that Qt should be smart enough to guess correctly), but it can be set to other values to use a specific printer selection option.
If the printer selection option is changed while the printer is active, the current print job may or may not be affected.
This function has no effect on Windows or Mac.
另请参阅 printerSelectionOption () 和 setPrintProgram ().
Requests that the printer prints at dpi or as near to dpi as possible.
此设置影响返回坐标系，例如 QPainter::viewport ().
This function must be called before QPainter::begin () to have an effect on all platforms.
另请参阅 resolution () 和 setPaperSize ().
Returns the supported paper sizes for this printer.
The values will be either a value that matches an entry in the QPrinter::PaperSource enum or a driver spesific value. The driver spesific values are greater than the constant DMBIN_USER declared in wingdi.h.
警告： 此函数只可用于 Windows。
Returns a list of the resolutions (a list of dots-per-inch integers) that the printer says it supports.
For X11 where all printing is directly to PDF, this function will always return a one item list containing only the PDF resolution, i.e., 72 (72 dpi -- but see PrinterMode ).
返回
true
if the printer supports printing multiple copies of the same document in one job; otherwise false is returned.
On most systems this function will return true. However, on X11 systems that do not support CUPS, this function will return false. That means the application has to handle the number of copies by printing the same document the required number of times.
该函数在 Qt 4.7 引入。
另请参阅 setCopyCount () 和 copyCount ().
Returns the number of the last page in a range of pages to be printed (the "to page" setting). Pages in a document are numbered according to the convention that the first page is page 1.
By default, this function returns a special value of 0, meaning that the "to page" setting is unset.
注意： 若 fromPage () and toPage() both return 0, this indicates that the whole document will be printed .
The programmer is responsible for reading this setting and printing accordingly.
该函数在 Qt 4.1 引入。