Timothy Pearson
14 years ago
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Frequently Asked Questions
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Please note: the latest version of this and other FAQ lists are available at:
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http://www.trolltech.com/faq/
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What is Trolltech?
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Trolltech is an international software company with headquarters in Oslo,
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the capital of Norway, and with offices in Brisbane, Australia, and Santa
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Clara, California. Our flagship product is Qt, the multi-platform C++ GUI
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toolkit.
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Trolltech AS was founded in 1994, although the development of Qt
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itself began in 1992. Since then, Qt has undergone continual expansion
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and improvement. Qt is currently used in thousands of software
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development projects world-wide.
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----------------------------------------------------------------------------
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Is there a graphical designer/dialog builder for Qt?
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Yes, Qt Designer.
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----------------------------------------------------------------------------
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Are there mailing lists for Qt?
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There are three: qt-interest, qt-announce and snapshot-users. You can tqfind
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descriptions, instructions for joining them, and an archive on
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http://lists.trolltech.com/
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----------------------------------------------------------------------------
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I think I have found a bug in Qt. Where can I report it?
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Please report to qt-bugs@trolltech.com. Remember to include the version
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number of Qt, and the make and version of your compiler and your operating
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system.
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----------------------------------------------------------------------------
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Is the Reference Documentation available in printed form?
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No. But experimental PDF versions are available.
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Is the Reference Documentation available in PDF format?
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Experimentally, yes.
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We recommend using the HTML format documentation which is included in
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the Qt source archive and is updated with every release, minor or
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major. You can browse from your local disk, you don't need to access
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www.trolltech.com. Open the file qt/doc/html/index.html with your
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favorite web browser, or run Qt Assistant. The PDF files are available
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from ftp://ftp.trolltech.com/qt/pdf/3.0
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The PDF files are large, only updated with major version releases, and
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their typesetting is experimental. We hope to improve the PDF
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typesetting in future, if there is sufficient demand for this format.
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----------------------------------------------------------------------------
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What kinds of license exist for Qt?
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The Qt toolkit is available under two different licenses: The Professional
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and Enterprise Editions for commercial use on all platforms, and the Open Source
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Edition for developing open source or free software for the X11 platform.
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What are the differences between the Professional/Enterprise Editions and
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Open Source Edition of Qt?
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You may write commercial/proprietary/non-free software only if you
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have purchased the Professional or Enterprise Edition. The library
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itself is the same. With the commercial editions, you also get
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technical support and upgrades. A non-commercial edition of Qt for
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Microsoft Windows is available. Qt for Mac OS X is only available as
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Professional and Enterprise Editions.
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Can we use the Open Source Edition while developing our non-free application
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and then purchase commercial licenses when we start to sell it?
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No. The Open Source Edition license applies to the development phase
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- anything developed without Professional or Enterprise Edition
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licenses must be released as free/open source software.
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When will version x.y be released? Will it include so-and-so feature?
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We avoid specifying which features will be available in particular
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versions or when versions will be released. This way we never make
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promises that are not kept.
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Are there any books about Qt programming?
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Yes, several. They are listed on
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http://www.trolltech.com/developer/documentation/literature.html
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----------------------------------------------------------------------------
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Is there an evaluation version of Qt for Windows so I can try it out
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before purchasing?
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Yes, see details on
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http://www.trolltech.com/products/qt/evaluate.html
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----------------------------------------------------------------------------
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I don't want to give away my source code. What do I do?
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Then you need a Professional or Enterprise Edition license.
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----------------------------------------------------------------------------
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What tool do you use to create the Reference Documentation? Where can I
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get it?
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The documentation generator we use is an internal tool. You might like
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to investigate the Doxygen program, a free tool specifically designed
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to be used for projects that make use of the Qt toolkit. Doxygen
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offers functionality very similar to our internal tool, and can link
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to the Qt documentation. For more information about Doxygen, visit the
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Doxygen home page ( http://www.stack.nl/~dimitri/doxygen/ ). Note that
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Doxygen is an independent project not supported by Trolltech.
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----------------------------------------------------------------------------
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Can I charge for my application?
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If you have a Professional or Enterprise Edition license: Yes, of
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course. If you use the Open Source Edition your software must be freely
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redistributable and you must include the source. The Open Source Edition
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is intended for open source software. We realize that CD-ROMs cost money
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to produce, for example, so you may charge a copying fee.
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----------------------------------------------------------------------------
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Where can I tqfind Qt Open Source Edition?
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The latest version of Qt Open Source Edition can be downloaded from
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http://www.trolltech.com or from ftp.trolltech.com, and a whole range of
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ftp mirror sites around the world. Look for a mirror near you on the list
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available under http://www.trolltech.com/dl/ We encourage all developers
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of free Qt software to upload their work to ftp.trolltech.com.
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----------------------------------------------------------------------------
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I want to port Qt to a new platform. What do I do?
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If the new platform is POSIX-like and runs the X Window System, it's
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simple. Read the file PORTING for details.
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----------------------------------------------------------------------------
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Can I make a Qt shared library and distribute it with my Linux
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distribution?
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Yes.
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----------------------------------------------------------------------------
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I found this obscure bug and I need it fixed, fast!
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Qt Professional and Enterprise Editions includes a technical support
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service. We try to support the developers using the Qt Open Source Edition
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as well, and we take all bug reports seriously, no matter who they come
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from. But, of course, when there's too much to do, and our customers
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have highest priority.
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----------------------------------------------------------------------------
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How would you compare Qt with Java?
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We believe Qt to be a superiour solution for most development tasks,
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not least for performance and portability reasons. Ref:
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Qt vs. Java whitepaper by Matthias Kalle Dalheimer:
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ftp://ftp.trolltech.com/qt/pdf/qt-vs-java-whitepaper.pdf
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A Java Critique by Peter Becker, including comparisons to Qt:
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http://www.peterbecker.de/texts/javacritique.html
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Why PGS selected Qt after trying Java:
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http://www.trolltech.com/products/success/pgs.html
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----------------------------------------------------------------------------
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