Category: Qt print to pdf

Qt print to pdf

Vokree / 08.12.2020

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have tried to write some code to print a pdf file using Qt but somehow it's not working. If anybody has any idea to solve this problem, please provide your tips.

I didn't understand your question, but now I get it. Qt does not have support for loading and display PDF. For PDF support in Qt you need external library poppler.

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Check this article. I tried to edit your code so that I can test it a bit and it works for me, can you check? Maybe try to check if QPrinter::isValid returns true in your environment. Learn more. How to print pdf file in Qt Ask Question. Asked 8 years, 4 months ago. Active 1 year, 5 months ago. Viewed 23k times. HostileFork says dont trust SE 30k 7 7 gold badges 85 85 silver badges bronze badges. Post the code that doesn't work, we can't help you otherwise.

Edit your question to include the code in it. Do this yourself next time. Don't add it in the comments. Bart:- Sure Bart Thanks for your help.

While StackOverflow often gives answers surprisingly quickly, don't comment a mere hour after your post with "Please help! Also, you have the ability to edit your posts AND to delete comments you have made. So you can delete the long comments you made with source code to make this question cleaner Active Oldest Votes.

Here is how do you print text into PDF file. LukasT LukasT 1 1 silver badge 12 12 bronze badges. Dear Thomas,Thanks a lot for your response.

I will check this and get back 2 u surely. Dear Thomas,Colud you please help me to print pdf file on printer in windows system environment? Did you check if QPrinter::isValid returns true?

Qt is cross-platform, so it should work. Dear Lukas,It's not working for me as i m getting warning "QPrintDialog: Cannot be used on non-native printers " and not able to printing the pdf file.Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions. Please download a browser that supports JavaScript, or enable it if it's disabled i. I know this topic has been discussed a million times, but i dont understand why it isnt working for me.

I want to create and write into a PDF file, when i click on a button. This is just one of many different approaches i tried. The problem is, QT doesnt create any file. Here's a working example. Eddy Yes. Thanks for your answers. I am not sure about the arguments in painter. Just use painter2. Have you read the QPainter documentation? I try it. Pixmap and I run my program I clicked the createpdf button and it show a blank paper it didn't show this painter. Please refer to the documentation I linked in one of my previous posts - in that webpage together with a quite detailed overview on how to use QPainter there is also a list of the methods provided.

You will see that QPainter::drawPixmap comes in many variants with different arguments list so you can choose the one that best suits your needs. It seems to me that taking a look at Paint System would also bring you some significant benefits in terms of overall understanding how to accomplish what you aim for.

Handling PDF

Please refer to the documentation I linked above to learn how to draw on widgets. It would be more helpful and consistent than explaining every detail in here.

Qt Forum. Only users with topic management privileges can see it.Qt provides extensive cross-platform support for printing. Using the printing systems on each platform, Qt applications can print to attached printers and across networks to remote printers.

qt print to pdf

Qt's printing system also supports PDF file generation, providing the foundation for basic report generation facilities. In Qt, printers are represented by QPrintera paint device that provides functionality specific to printing, such as support for multiple pages and double-sided output.

As a result, printing involves using a QPainter to paint onto a series of pages in the same way that you would paint onto a custom widget or image. Although QPrinter objects can be constructed and set up without requiring user input, printing is often performed as a result of a request by the user; for example, when the user selects the File Print In such cases, a newly-constructed QPrinter object is supplied to a QPrintDialogallowing the user to specify the printer to use, paper size, and other printing properties.

It is also possible to set certain default properties by modifying the QPrinter before it is supplied to the print dialog. For example, applications that generate batches of reports for printing may set up the QPrinter to write to a local file by default rather than to a printer.

Once a QPrinter object has been constructed and set up, a QPainter can be used to perform painting operations on it. We can construct and set up a painter in the following way:. Since the QPrinter starts with a blank page, we only need to call the newPage function after drawing each page, except for the last page.

The document is sent to the printer, or written to a local file, when we call end. QPrinter provides functions that can be used to obtain information about the dimensions of the paper the paper rectangle and the dimensions of the printable area the page rectangle. These are given in logical device coordinates that may differ from the physical coordinates used by the device itself, indicating that the printer is able to render text and graphics at a typically higher resolution than the user's display.

Although we do not need to handle the conversion between logical and physical coordinates ourselves, we still need to apply transformations to painting operations because the pixel measurements used to draw on screen are often too small for the higher resolutions of typical printers. The paperRect and pageRect functions provide information about the size of the paper used for printing and the area on it that can be painted on.

The rectangle returned by pageRect usually lies inside the rectangle returned by paperRect. You do not need to take the positions and sizes of these area into account when using a QPainter with a QPrinter as the underlying paint device; the origin of the painter's coordinate system will coincide with the top-left corner of the page rectangle, and painting operations will be clipped to the bounds of the drawable part of the page. The paint system automatically uses the correct device metrics when painting text but, if you need to position text using information obtained from font metrics, you need to ensure that the print device is specified when you construct QFontMetrics and QFontMetricsF objects, or ensure that each QFont used is constructed using the form of the constructor that accepts a QPaintDevice argument.

To print a widget, you can use the QWidget::render function. As mentioned, the printer's resolution is usually higher than the screen resolution, so you will have to scale the painter.

You may also want to position the widget on the page. The following code sample shows how this may look. As a result, it is these content handling classes that usually provide printing functionality, either via a function that can be used to perform the complete task, or via a function that accepts an existing QPainter object. Some widgets provide convenience functions to expose underlying printing features, avoiding the need to obtain the content handler just to call a single function.

The following table shows which class and function are responsible for printing from a selection of different widgets. For widgets that do not expose printing functionality directly, the content handling classes containing this functionality can be obtained via a function in the corresponding widget's API.Qt provides extensive cross-platform support for printing. Using the printing systems on each platform, Qt applications can print to attached printers and across networks to remote printers.

Qt's printing system also enables PostScript and PDF files to be generated, providing the foundation for basic report generation facilities. In Qt, printers are represented by QPrintera paint device that provides functionality specific to printing, such as support for multiple pages and double-sided output. As a result, printing involves using a QPainter to paint onto a series of pages in the same way that you would paint onto a custom widget or image.

Although QPrinter objects can be constructed and set up without requiring user input, printing is often performed as a result of a request by the user; for example, when the user selects the File Print In such cases, a newly-constructed QPrinter object is supplied to a QPrintDialogallowing the user to specify the printer to use, paper size, and other printing properties.

It is also possible to set certain default properties by modifying the QPrinter before it is supplied to the print dialog. For example, applications that generate batches of reports for printing may set up the QPrinter to write to a local file by default rather than to a printer. Once a QPrinter object has been constructed and set up, a QPainter can be used to perform painting operations on it.

We can construct and set up a painter in the following way:. Since the QPrinter starts with a blank page, we only need to call the newPage function after drawing each page, except for the last page.

The document is sent to the printer, or written to a local file, when we call end. QPrinter provides functions that can be used to obtain information about the dimensions of the paper the paper rectangle and the dimensions of the printable area the page rectangle. These are given in logical device coordinates that may differ from the physical coordinates used by the device itself, indicating that the printer is able to render text and graphics at a typically higher resolution than the user's display.

Although we do not need to handle the conversion between logical and physical coordinates ourselves, we still need to apply transformations to painting operations because the pixel measurements used to draw on screen are often too small for the higher resolutions of typical printers.

The paperRect and pageRect functions provide information about the size of the paper used for printing and the area on it that can be painted on. The rectangle returned by pageRect usually lies inside the rectangle returned by paperRect. You do not need to take the positions and sizes of these area into account when using a QPainter with a QPrinter as the underlying paint device; the origin of the painter's coordinate system will coincide with the top-left corner of the page rectangle, and painting operations will be clipped to the bounds of the drawable part of the page.

The paint system automatically uses the correct device metrics when painting text but, if you need to position text using information obtained from font metrics, you need to ensure that the print device is specified when you construct QFontMetrics and QFontMetricsF objects, or ensure that each QFont used is constructed using the form of the constructor that accepts a QPaintDevice argument.

To print a widget, you can use the QWidget::render function. As mentioned, the printer's resolution is usually higher than the screen resolution, so you will have to scale the painter. You may also want to position the widget on the page. The following code sample shows how this may look.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.

Qt Documentation

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. Many of these functions can only be called before the actual printing begins i.

Printing with Qt

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.

qt print to pdf

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. This enum type is used to indicate whether QPrinter should print in color or not. This enum is used to indicate whether printing will occur on one or both sides of each sheet of paper simplex or duplex printing.

This enum type not to be confused with Orientation is used to specify each page's orientation. The OutputFormat enum is used to describe the format QPrinter should use for printing.

qt print to pdf

This enum type is used by QPrinter to tell the application program how to print. 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::setFullPageto determine the printable area.

With setFullPage false the defaultthe metrics will be a bit smaller; how much depends on the printer in use. 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. This enum describes the mode the printer should work in. It basically presets a certain resolution and working mode.

Note: 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.

Note the difference between Point and DevicePixel. 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. Aborts the current print run. Returns true if the print run was successfully aborted and printerState will return QPrinter::Aborted ; otherwise returns false.

Qt Tutorials For Beginners 31 - QPrintDialog and QPrinter

It is not always possible to abort a print job.Please also read the general considerations outlined on the Handling Document Formats page.

The most basic but not necessarily simplest way of creating PDF documents with QPrinter is by manually painting the document's content with Qt's Arthur paint system. Just pass the QPrinter object as a reference to the constructor of QPainter or, alternatively, to QPainter::begin for an already existing QPainter and then perform any painting operations with that QPainter instance like you usually would with intermittent calls to QPrinter::newPage whenever you want to move on to the next PDF page.

For a more high-level API for creating structured rich-text documents, use Qt's Scribe framework see Handling Document Formatswhich is based on a cursor interface that mimics the behavior of a cursor in a text editor.

Qt's Graphics View framework can be a more suitable alternative for creating PDF documents with content that is mainly based on arbitrarily positioned and transformed 2D graphical items rather than continuous flowed rich text.

The conversion tool could be bundled with your application or specified as a prerequisite, and controlled via QProcess. Some possibilities are:. More details here. For rendering pages or elements from existing PDF documents to image files or in-memory pixmaps useful e.

Many users have already chosen and installed a stand-alone PDF viewer according to their personal preferences, so simply letting the operating system open the PDF file with whatever it considers the default viewer for such files, might be the easiest and potentially most user-friendly choice.

qt print to pdf

If you're downloading the file from the Internet, store it on disk using QTemporaryFile first, since not all viewers can handle remote URLs.

As an alternative to using QWebView for running the plugin, it is possible to use a third-party solution that allows embedding NPAPI plugins in a Qt application without the overhead of a full web browser instance:. Jump to: navigationsearch. Category : Developing with Qt. Navigation menu Personal tools Sign in. Namespaces Page Discussion. Views Read View source View history.

Navigation Main page Recent changes Random page Help. This page was last modified on 30 Januaryat Privacy policy About Qt Wiki Disclaimers. Hummus [pdfhummus. PoDoFo [podofo. Inkscape [inkscape. Adobe Reader [get. QtitanMultimedia [devmachines.Qt provides extensive cross-platform support for printing. Using the printing systems on each platform, Qt applications can print to attached printers and across networks to remote printers.

Qt's printing system also enables PostScript and PDF files to be generated, providing the foundation for basic report generation facilities. In Qt, printers are represented by QPrintera paint device that provides functionality specific to printing, such as support for multiple pages and double-sided output. As a result, printing involves using a QPainter to paint onto a series of pages in the same way that you would paint onto a custom widget or image. Although QPrinter objects can be constructed and set up without requiring user input, printing is often performed as a result of a request by the user; for example, when the user selects the File Print In such cases, a newly-constructed QPrinter object is supplied to a QPrintDialogallowing the user to specify the printer to use, paper size, and other printing properties.

It is also possible to set certain default properties by modifying the QPrinter before it is supplied to the print dialog. For example, applications that generate batches of reports for printing may set up the QPrinter to write to a local file by default rather than to a printer.

Once a QPrinter object has been constructed and set up, a QPainter can be used to perform painting operations on it. We can construct and set up a painter in the following way:. Since the QPrinter starts with a blank page, we only need to call the newPage function after drawing each page, except for the last page.

The document is sent to the printer, or written to a local file, when we call end. QPrinter provides functions that can be used to obtain information about the dimensions of the paper the paper rectangle and the dimensions of the printable area the page rectangle. These are given in logical device coordinates that may differ from the physical coordinates used by the device itself, indicating that the printer is able to render text and graphics at a typically higher resolution than the user's display.

Although we do not need to handle the conversion between logical and physical coordinates ourselves, we still need to apply transformations to painting operations because the pixel measurements used to draw on screen are often too small for the higher resolutions of typical printers.

The paperRect and pageRect functions provide information about the size of the paper used for printing and the area on it that can be painted on. The rectangle returned by pageRect usually lies inside the rectangle returned by paperRect. You do not need to take the positions and sizes of these area into account when using a QPainter with a QPrinter as the underlying paint device; the origin of the painter's coordinate system will coincide with the top-left corner of the page rectangle, and painting operations will be clipped to the bounds of the drawable part of the page.

The paint system automatically uses the correct device metrics when painting text but, if you need to position text using information obtained from font metrics, you need to ensure that the print device is specified when you construct QFontMetrics and QFontMetricsF objects, or ensure that each QFont used is constructed using the form of the constructor that accepts a QPaintDevice argument.

To print a widget, you can use the QWidget::render function. As mentioned, the printer's resolution is usually higher than the screen resolution, so you will have to scale the painter. You may also want to position the widget on the page.

The following code sample shows how this may look. As a result, it is these content handling classes that usually provide printing functionality, either via a function that can be used to perform the complete task, or via a function that accepts an existing QPainter object.

Some widgets provide convenience functions to expose underlying printing features, avoiding the need to obtain the content handler just to call a single function. The following table shows which class and function are responsible for printing from a selection of different widgets. For widgets that do not expose printing functionality directly, the content handling classes containing this functionality can be obtained via a function in the corresponding widget's API.

QTextEdit requires a QPrinter rather than a QPainter because it uses information about the configured page dimensions in order to insert page breaks at the most appropriate places in printed documents. Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd.


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