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503 lines
22 KiB
503 lines
22 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>The TQt FAQ</h1>
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<p>
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<p> See also the <a href="commonproblems.html">Technical FAQ</a>.
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<p> <!-- toc -->
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<ul>
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<li><a href="#1"> General Questions
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</a>
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<ul>
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<li><a href="#1-1"> What is TQt?
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</a>
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<li><a href="#1-2"> What is Trolltech?
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</a>
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<li><a href="#1-3"> How can I evaluate TQt?
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</a>
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<li><a href="#1-4"> What does TQt cost?
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</a>
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<li><a href="#1-5"> How can I buy TQt?
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</a>
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<li><a href="#1-6"> What kind of technical support is available for TQt?
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</a>
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<li><a href="#1-7"> Who provides training for TQt?
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</a>
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<li><a href="#1-8"> Who provides consultancy for TQt?
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</a>
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<li><a href="#1-9"> Are there any books about TQt programming?
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</a>
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<li><a href="#1-10"> What is the Open Source Edition?
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</a>
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<li><a href="#1-11"> What is the idea behind having a free version of TQt?
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</a>
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<li><a href="#1-12"> Is there a low-cost version of TQt for writing shareware?
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</a>
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</ul>
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<li><a href="#2"> Questions about TQt's Users
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</a>
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<ul>
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<li><a href="#2-1"> How many developers use TQt?
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</a>
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<li><a href="#2-2"> Which major corporations use TQt?
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</a>
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<li><a href="#2-3"> Are there any well-known applications that use TQt?
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</a>
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</ul>
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<li><a href="#3"> Questions about Developing Applications with TQt
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</a>
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<ul>
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<li><a href="#3-1"> Is there a mailing list for TQt?
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</a>
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<li><a href="#3-2"> Is TQt's documentation available online?
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</a>
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<li><a href="#3-3"> Is there a technical newsletter for TQt?
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</a>
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<li><a href="#3-4"> I think I have found a bug in TQt. Where can I report it?
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</a>
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</ul>
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<li><a href="#4"> Questions about Professional Licensing
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</a>
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<ul>
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<li><a href="#4-1"> We have purchased a license, but the developer is leaving the company
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project. Can we transfer the license to another developer?
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</a>
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<li><a href="#4-2"> Can I purchase floating licenses for TQt?
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</a>
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<li><a href="#4-3"> Can we use the Open Source Edition while developing our non-free
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application and then purchase commercial licenses when we start to
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sell it?
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</a>
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</ul>
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<li><a href="#5"> Questions about Open Source Software Licensing
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</a>
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<ul>
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<li><a href="#5-1"> I just want to run KDE and other TQt-based software on my
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machine. Can I do that with the Open Source Edition?
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</a>
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<li><a href="#5-2"> I want to put TQt, and applications that use it, on a CD-ROM or on
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a web site. Can I do that with the Open Source Edition?
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</a>
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<li><a href="#5-3"> Can I make software with the TQt Open Source Edition and release it under
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the GNU GPL, BSD, or Artistic license?
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</a>
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<li><a href="#5-4"> I don't want to give away my source code. What do I do?
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</a>
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<li><a href="#5-5"> Is software based on the TQt Open Source Edition really free? Does it
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carry any Trolltech-specific license restrictions?
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</a>
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<li><a href="#5-6"> What if Trolltech stops releasing Open Source Editions of TQt?
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</a>
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<li><a href="#5-7"> Using the Open Source Edition, can I make non-free software for internal
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use in my company/organization?
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</a>
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<li><a href="#5-8"> Is TQt Open Source Edition really free software in the GNU meaning of the
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word?
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</a>
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<li><a href="#5-9"> If the Open Source Edition is GNU GPL, aren't there license conflicts
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with incompatible open source licenses? How come people can even
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run commercial software like the Opera web browser with it?
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</a>
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<li><a href="#5-10"> Doesn't such an en extra license in addition to the GNU GPL
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violate the terms of the GPL or at least make the whole package
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GPL-incompatible?
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</a>
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<li><a href="#5-11"> Why is TQt Open Source Edition not distributed under the GNU Lesser
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General Public License (LGPL)?
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</a>
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</ul>
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<li><a href="#6"> Questions about other programming languages
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</a>
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<ul>
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<li><a href="#6-1"> Are there bindings to languages other than C++?
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</a>
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<li><a href="#6-2"> Can I develop commercial applications with PerlTQt or PyTQt or other
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TQt wrappers?
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</a>
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</ul>
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</ul>
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<!-- endtoc -->
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<p> <hr>
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<h2> General Questions
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</h2>
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<a name="1"></a><p> <hr width="30%">
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<h3> What is TQt?
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</h3>
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<a name="1-1"></a><p> TQt is a multiplatform C++ GUI toolkit. It
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provides application developers with all the functionality
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needed to build applications with state-of-the-art graphical
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user interfaces. TQt is fully object-oriented, easily
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extensible, and allows true component programming.
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<p> TQt is supported on the following platforms:
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<p> <ul>
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<li> <b>MS/Windows</b> -- 95, 98, NT 4.0, ME, 2000, and XP
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<li> <b>Unix/X11</b> -- Linux, Sun Solaris, HP-UX, Compaq Tru64 UNIX,
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IBM AIX, SGI IRIX and a wide range of others
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<li> <b>Macintosh</b> -- Mac OS X
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<li> <b>Embedded</b> -- Linux platforms with framebuffer support.
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</ul>
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<p> It has become the emerging standard development
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environment for IT professionals who want to:
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<p> <ul>
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<li> Write (and maintain) a single source-tree.
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<li> Port their applications to multiple platforms with a simple
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recompilation.
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<li> Internationalize their applications.
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<li> Provide their applications with native look and feel.
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<li> Have their applications run at native speed.
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</ul>
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<p> <hr width="30%">
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<h3> What is Trolltech?
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</h3>
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<a name="1-2"></a><p> Trolltech is an international software company with
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headquarters in Oslo, the capital of Norway, and with offices
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in Brisbane, Australia, and Redwood City, California. Our
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flagship product is TQt, the multi-platform C++ GUI toolkit.
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<p> Trolltech ASA was founded in 1994, although, the core team of designers
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started TQt's development in 1992.
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<p> More details can be found at <a href="troll.html">Trolltech</a>.
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<p> <hr width="30%">
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<h3> How can I evaluate TQt?
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</h3>
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<a name="1-3"></a><p> We offer 30 day evaluation versions of TQt on all our supported platforms.
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Further details can be found here: <a href="http://www.trolltech.com/evaluate.html">http://www.trolltech.com/evaluate.html</a>.
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<p> <hr width="30%">
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<h3> What does TQt cost?
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</h3>
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<a name="1-4"></a><p> This depends on your number of developers, on how many
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different platforms you target, and on the edition of TQt you
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choose. Currently we offer two different editions (Enterprise
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Edition and Professional Edition) on four different
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platforms (Microsoft Window, Unix/X11, Macintosh and Linux/embedded).
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<p> We also offer discounts for academic and research institutions.
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<p> Details on pricing can be found here:
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<a href="http://www.trolltech.com/pricing.html">http://www.trolltech.com/pricing.html</a>.
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<p> <hr width="30%">
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<h3> How can I buy TQt?
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</h3>
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<a name="1-5"></a><p> To purchase, please visit the <a
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href="https://webshop.trolltech.com/cgi-bin/index.cgi">Trolltech
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webshop</a>. In the webshop, you can generate a Purchase Order, order
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a Quote, or purchase directly using a credit card.
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<p> For further information and assistance, please contact Trolltech sales:
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<p> Email: <a href="mailto:sales@trolltech.com">sales@trolltech.com</a>
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Phone, US office (for North America): <strong>(+1) 650-813-1676</strong>
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Phone, Norway office (for others): <strong>+47 2160 4800</strong>
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<p> <hr width="30%">
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<h3> What kind of technical support is available for TQt?
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</h3>
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<a name="1-6"></a><p> Trolltech offers email support to commercial licensees. The first year
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of Trolltech's Support and Maintenance Service is included with the
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purchase of TQt Professional and TQt Enterprise Edition licenses.
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Licenses can be kept up-to-date and fully supported by buying
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the Support and Maintenance Service for the licenses held in each
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subsequent year.
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<p> For further information see here:
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<a href="http://www.trolltech.com/support/">http://www.trolltech.com/support/</a>.
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<p> <hr width="30%">
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<h3> Who provides training for TQt?
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</h3>
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<a name="1-7"></a><p> A number of companies provide TQt training, in Asia, Europe and the US.
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Trolltech has agreements with a number of official training
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partners, who offer Trolltech approved courses. In addition
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there are a number of independently developed courses run by third
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parties. You can find more information about the partners and the
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courses here: <a href="http://www.trolltech.com/training/">http://www.trolltech.com/training/</a>.
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<p> <hr width="30%">
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<h3> Who provides consultancy for TQt?
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</h3>
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<a name="1-8"></a><p> A number of companies provide consultancy services for TQt and
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TQtopia. You can find a partial list here:
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<a href="http://www.trolltech.com/company/servicepartners.html">http://www.trolltech.com/company/servicepartners.html</a>.
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<p> <hr width="30%">
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<h3> Are there any books about TQt programming?
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</h3>
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<a name="1-9"></a><p> Yes, there are quite a few books on TQt, most of them
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available from amazon.com. You can find a partial list at
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<a href="http://www.trolltech.com/developer/books.html">http://www.trolltech.com/developer/books.html</a>.
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<p> The official TQt book is
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<a href="http://www.amazon.com/exec/obidos/ASIN/0131240722/trolltech/">C++ GUI Programming with TQt 3</a>.
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<p> <hr width="30%">
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<h3> What is the Open Source Edition?
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</h3>
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<a name="1-10"></a><p> The TQt Open Source Edition is our non-commercial versions of
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TQt. You can use this edition to create and run free
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software, i.e. software that is licensed under the GNU GPL or
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a similarly recognized open source license.
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<p> TQt Open Source edition is available for Unix/X11, Macintosh and
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Linux/embedded.
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<p> <hr width="30%">
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<h3> What is the idea behind having a free version of TQt?
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</h3>
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<a name="1-11"></a><p> With the Open Source Edition, Trolltech has found a way to support
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the free software concept. Part of our commitment is to enable
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those who contribute to the free software pool to do so
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without paying license fees.
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<p> <hr width="30%">
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<h3> Is there a low-cost version of TQt for writing shareware?
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</h3>
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<a name="1-12"></a><p> No, but TQt's commercial licenses permit you to write and sell
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shareware written with TQt.
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<p> <hr>
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<h2> Questions about TQt's Users
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</h2>
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<a name="2"></a><p> <hr width="30%">
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<h3> How many developers use TQt?
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</h3>
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<a name="2-1"></a><p> We don't know! We can count our many thousands of commercial
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licensees, but the number of free software developers
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using TQt can only be guessed based on download figures, book
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sales, the number of open source TQt applications available on
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the web, Universities teaching with TQt, and other factors. A
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conservative estimate would put the figure at around 100,000 to
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150,000 developers world-wide.
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<p> <hr width="30%">
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<h3> Which major corporations use TQt?
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</h3>
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<a name="2-2"></a><p> See our list of reference customers at
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<a href="http://www.trolltech.com/company/customers.html">http://www.trolltech.com/company/customers.html</a>. Note that many
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commercial customers do not disclose their use of TQt because they see
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TQt as a competitive advantage.
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<p> <hr width="30%">
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<h3> Are there any well-known applications that use TQt?
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</h3>
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<a name="2-3"></a><p> There are many, e.g. Adobe Photoshop Album from Abobe
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Corporation and the KDE desktop. A partial list can be found at
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<a href="http://www.trolltech.com/products/qt/apps-using-qt.html">http://www.trolltech.com/products/qt/apps-using-qt.html</a>
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<p> <hr>
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<h2> Questions about Developing Applications with TQt
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</h2>
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<a name="3"></a><p> <hr width="30%">
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<h3> Is there a mailing list for TQt?
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</h3>
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<a name="3-1"></a><p> Trolltech operates several mailing lists for TQt users including
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<tt>qt-announce</tt>, <tt>qt-interest</tt> and <tt>snapshot-users</tt>.
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<p> See <a href="http://lists.trolltech.com">Mailing lists</a>.
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<p> <hr width="30%">
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<h3> Is TQt's documentation available online?
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</h3>
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<a name="3-2"></a><p> Yes, at <a href="http://doc.trolltech.com">http://doc.trolltech.com</a>.
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<p> <hr width="30%">
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<h3> Is there a technical newsletter for TQt?
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</h3>
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<a name="3-3"></a><p> Yes, <a href="http://doc.trolltech.com/qq/index.html">TQt
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Quarterly</a>. It is a paper-based newsletter exclusively
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available to TQt licensees.
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<p> As a courtesy and convenience to all our users, a selection of
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articles is also published online about one month after publication.
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<p> <hr width="30%">
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<h3> I think I have found a bug in TQt. Where can I report it?
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</h3>
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<a name="3-4"></a><p> Bugs should be reported to <a href="mailto:qt-bugs@trolltech.com">qt-bugs@trolltech.com</a>. But <em>please</em> read (the very short)
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<a href="bughowto.html">How to Report a Bug</a> page <em>first</em>.
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<p> <hr>
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<h2> Questions about Professional Licensing
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</h2>
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<a name="4"></a><p> <hr width="30%">
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<h3> We have purchased a license, but the developer is leaving the company
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project. Can we transfer the license to another developer?
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</h3>
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<a name="4-1"></a><p> Yes. TQt licences are for the individual use of named developers. If
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the developer associated with a licence leaves the organization, or
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moves on to another project that does not require a TQt license,
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another developer can take over the licence. You can change the name
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of the developer using a licence at any time, but after a change you
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must wait at least six (6) months before changing again.
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<p> <hr width="30%">
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<h3> Can I purchase floating licenses for TQt?
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</h3>
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<a name="4-2"></a><p> No, we do not offer floating licenses.
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<p> The reason is this: Floating licenses are based on the concept
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of defining a maximum number of concurrent users. For example,
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for a word processor, this means the maximum number of
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instances of that application that can be running at any
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time. However, for a library product like TQt, there is no main
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application that is always running when the product is being
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used. Hence, it is not possible to count the number of
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concurrent users, and therefore floating licenses do not
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make sense.
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<p>
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<p> <hr width="30%">
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<h3> Can we use the Open Source Edition while developing our non-free
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application and then purchase commercial licenses when we start to
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sell it?
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</h3>
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<a name="4-3"></a><p> No: our commercial license agreements only apply to software
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that was developed with TQt under the agreement. They do not
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apply to code that was developed with the TQt Open Source Edition
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prior to the agreement. Any software developed with TQt
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without a commercial license agreement must be released as
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free/open source software.
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<p> <hr>
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|
<h2> Questions about Open Source Software Licensing
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</h2>
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<a name="5"></a><p> <hr width="30%">
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<h3> I just want to run KDE and other TQt-based software on my
|
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machine. Can I do that with the Open Source Edition?
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</h3>
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<a name="5-1"></a><p> Yes. You may use the TQt Open Source Edition for running applications,
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both at home and at work, without restrictions.
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<p> <hr width="30%">
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<h3> I want to put TQt, and applications that use it, on a CD-ROM or on
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a web site. Can I do that with the Open Source Edition?
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</h3>
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<a name="5-2"></a><p> Yes. You may copy and redistribute the TQt Open Source Edition, both
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at home and at work, without restrictions.
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<p> <hr width="30%">
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<h3> Can I make software with the TQt Open Source Edition and release it under
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the GNU GPL, BSD, or Artistic license?
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</h3>
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<a name="5-3"></a><p> Yes. The GNU GPL, GPL-compatible licenses, or any other
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approved open source license will do. The FSF.org and
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OpenSource.org web sites list approved software licenses.
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<p> <hr width="30%">
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<h3> I don't want to give away my source code. What do I do?
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</h3>
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<a name="5-4"></a><p> You need to buy a commercial TQt license.
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<p> <hr width="30%">
|
|
<h3> Is software based on the TQt Open Source Edition really free? Does it
|
|
carry any Trolltech-specific license restrictions?
|
|
</h3>
|
|
<a name="5-5"></a><p> Yes, it really is free. This is because the TQt Open Source Edition
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uses the GNU GPL, which forbids the imposition of any license
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|
restrictions on software based on the Open Source Edition that would
|
|
make it non-free. And no, there are no Trolltech-specific
|
|
license restrictions on software produced using the Open Source
|
|
Edition.
|
|
<p> <hr width="30%">
|
|
<h3> What if Trolltech stops releasing Open Source Editions of TQt?
|
|
</h3>
|
|
<a name="5-6"></a><p> We have absolutely no intention of doing that. Together with
|
|
the K Desktop Environment project, we have set up the KDE Free
|
|
TQt Foundation (see
|
|
<a href="http://www.kde.org/whatiskde/kdefreeqtfoundation.php">http://www.kde.org/whatiskde/kdefreeqtfoundation.php</a>) to
|
|
legally guarantee the availability of TQt for free software
|
|
development now and forever - even if circumstances beyound
|
|
our control prevent us from producing new free editions.
|
|
<p> <hr width="30%">
|
|
<h3> Using the Open Source Edition, can I make non-free software for internal
|
|
use in my company/organization?
|
|
</h3>
|
|
<a name="5-7"></a><p> No. Software developed with the Open Source Edition is always free
|
|
software, i.e. it can only be distributed under a free
|
|
software license. In particular, all the source code for all
|
|
the modules your software is based on, regardless of whether
|
|
they have been written by you or by others, must be free
|
|
software. This is part of our commitment to the free software
|
|
community, and enables those who contribute to the free
|
|
software pool to do so without paying license fees.
|
|
<p> Although it is possible to write free software for internal
|
|
use, it is difficult to ensure that such software is used and
|
|
distributed legally. For example, if your free software
|
|
requires any modules that impose conditions on you that
|
|
contradict the conditions of the GNU GPL, including, but not
|
|
limited to, software patents, commercial license agreements,
|
|
copyrighted interface definitions or any sort of
|
|
non-disclosure agreement, then you cannot distribute it at
|
|
all; hence it cannot be given to consultants, employees for
|
|
their personal computers, subsidiaries, other divisions, or
|
|
even to new owners.
|
|
<p> Consequently we recommend using commercial licenses for all
|
|
internal software development.
|
|
<p> <hr width="30%">
|
|
<h3> Is TQt Open Source Edition really free software in the GNU meaning of the
|
|
word?
|
|
</h3>
|
|
<a name="5-8"></a><p> Yes - it is free software both as in "no cost" and as in
|
|
"free speech". Even more, it is actually available under the
|
|
terms of the GNU GPL. This means you can link GPL'ed software
|
|
to it, and you can take code from TQt and put it into other
|
|
GPL'ed software.
|
|
<p> <hr width="30%">
|
|
<h3> If the Open Source Edition is GNU GPL, aren't there license conflicts
|
|
with incompatible open source licenses? How come people can even
|
|
run commercial software like the Opera web browser with it?
|
|
</h3>
|
|
<a name="5-9"></a><p> If the Open Source Edition was licensed purely under the GNU GPL,
|
|
there would be problems. However, as long as TQt-based
|
|
software is either open source or was developed under a
|
|
commercial license agreement with Trolltech, we grant
|
|
permission to compile, link and run those programs with the
|
|
Open Source Edition. This is written down in our second free software
|
|
license, the TQPL.
|
|
<p> <hr width="30%">
|
|
<h3> Doesn't such an en extra license in addition to the GNU GPL
|
|
violate the terms of the GPL or at least make the whole package
|
|
GPL-incompatible?
|
|
</h3>
|
|
<a name="5-10"></a><p> No, because those extra license terms give you rights in
|
|
addition to those of the GNU GPL, including the right to
|
|
remove those extra terms.
|
|
<p> <hr width="30%">
|
|
<h3> Why is TQt Open Source Edition not distributed under the GNU Lesser
|
|
General Public License (LGPL)?
|
|
</h3>
|
|
<a name="5-11"></a><p> The LGPL is designed to "permit developers of non-free
|
|
programs to use free libraries" (quote from the LGPL). In
|
|
other words, if TQt Open Source Edition were LGPL'd, companies would
|
|
not have to purchase our commercial editions in order to make
|
|
commercial/proprietary software, they could just use the Open Source
|
|
Edition, free of charge. That would mean Trolltech would not
|
|
get the revenue necessary for improving and extending TQt.
|
|
<p> Note also that the Free Software Foundation discourages the
|
|
use of the LGPL.
|
|
<p> <hr>
|
|
<h2> Questions about other programming languages
|
|
</h2>
|
|
<a name="6"></a><p> <hr width="30%">
|
|
<h3> Are there bindings to languages other than C++?
|
|
</h3>
|
|
<a name="6-1"></a><p> Yes there are, e.g. bindings to Perl (PerlTQt) and Python
|
|
(PyTQt). These bindings were written by the open source
|
|
community and are not supported by Trolltech.
|
|
<p> <hr width="30%">
|
|
<h3> Can I develop commercial applications with PerlTQt or PyTQt or other
|
|
TQt wrappers?
|
|
</h3>
|
|
<a name="6-2"></a><p> Yes, if you have purchased a commercial license. The licensing
|
|
conditions are the same whether you use the TQt API directly in
|
|
C++, or you use it through some API wrapper in another
|
|
programming language. All developers that write code
|
|
containing calls to the TQt API (directly or through a wrapper)
|
|
need TQt licenses.
|
|
<p>
|
|
<!-- eof -->
|
|
<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|