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