I would start using C++ and develop commercials application with GUI. I found Qt libraries and seem that are good for my software.
I saw that Qt has LGPL license, I read that the license allow the developer to create an application and release it with different license, but I don't understand if at the moment I can develop a commercial C++ windows application (closed source) with Qt WITHOUT pay for the Commercial license.
Could someone clarify this point?
Thank you!
The LGPL licence means you can use Qt in a commercial application if, and only if, you dynamically link to it. That means using a DLL (or equivalent for your platform) rather than a static library. As long as you do this you can apply whatever licence you like to your actual application.
Look at the Wikipedia article for more information on the LGPL.
if you do so, you have to provide a way to get the source of the libraries under lgpl you are using.
Related
My question is interesting. I'm learning QT Framework with C++ but I wonder a topic. I'm writing a project and want to publish it under the GPL license. In this case, do I have to pay a fee for my QT?
Please answer me. Thanks..
I'm writing a project and want to publish it under the GPL license. In this case, do I have to pay a fee for my QT?
No.
Qt is triply-licensed (details) under GPLv2/GPLv3, LGPLv3 (free) and a commercial license (paid); as long as you use the GPL version, you are in the clear even if you distribute your application as a "derived work".
That being said, you can always use the LGPLv3 version of Qt for free in an application with pretty much any other license (including commercial ones) as long as you link dynamically against it or provide the means to the user to re-link your application with his own version of Qt and your application's license doesn't place requirements incompatible with the LGPLv3 (which apparently is the case for GPLv2).
I would like to make c++ that will work both on Linux and windows as I understand if I use the win32 template in visual studio then it will only work on windows is there something built into c++ like java's jframe that I can use. Also I would like to use any external library at this time.
Here are some cross platform alternatives QT, wxWidgets, Ultimate++. I have used QT, it is intuitive with a huge collection of tools to use in your code. The others are also popular but I have never used them.
I make used of wxWidgets due to it's cross platform and even cross architecture, native look on the OS where it appear. Binary application yields by wxWidgets is small enough thus make it possible to linking statically as portable application. Qt produce huge binary if linked statically (and may be violate qt licensing scheme).
Another reason are licensing flexibly, well documentation and supported by huge community arround the world. wx is considered as mature framework since it first release about 20yrs ago. It's use standard C++ syntax and preprocessor that will make you easily switch from plain C or C++. Complete library are available ranging from appeal window GUI, string, network, stream, webview, xml, and wx is playing very well with 3rd party library as such database SOCI, Asio, etc ....
You may try start to code with wxWidgets easily using Eclipse-IDE and wxFormBuilder as GUI designer. Plese check my experience for ease setup it's IDE+Toolchain. This wx installer can be used do develop, test and run wx application on Linux desktop, and then deploy the binary on Raspberry Pi is available for another board target beside Linux x86_64.
http://yasriady.blogspot.co.id/2016/01/raspberry-pi-toolchain.html
There is a cross-platform application & UI development framework called Qt. I think it meets your requirements. Click here for more info.
There is a long list of both active and dead cross-platform C++ UI libraries here: https://philippegroarke.com/posts/2018/c++_ui_solutions/
What is the license of Qt platform (Qt libraries, QT Creator, Designer, Linguist etc) after Digia bought it from Nokia?
Is it still LGPL? Are they planning to enforce their own commercial license? Or will there be three versions of it (GPL/LGPL/Commercial)?
Taken from the Digia's Qt Commercial Blog
Committed to both commercial and open-source licensing
Since we
acquired the commercial licensing business of Qt a bit more than a
year ago the Digia Qt R&D team has been hard at work developing and
releasing not only new and updated features and functions for Qt
Commercial customers, but also working together with the Qt Project
building and releasing both the commercial and LGPL releases,
contributing documentation, bug fixes and improvements mainly to the
desktop and embedded platforms.
...
With this acquisition Digia will have an increasing responsibility to
the global Qt community, not just the commercial licensing business.
We believe in the power of the Qt dual license. It is a great value
for Qt that it can be used under an open source and commercial
license, since customers have different needs and the licenses have
different purposes. Digia wants to continue the good co-operation with
different individual contributors and companies working together in
the Qt Project. We also are committed to continuing the special
relationship Qt has with the KDE community via the KDE Free Qt
Foundation. We believe that this symbiosis is valuable for everyone
involved.
...
We want to work with the entire Qt ecosystem through
the Qt Project to make sure that Qt will continue to thrive both under
commercial and open-source licenses.
Sounds like they want to keep things running the way they are and focus on making the commercial and open source communities even stronger.
I'm looking for cross platform open source third party library for web services which support c++. I have generated c++ files using WSMakeStubs utility but it uses Core Foundation data types. I want a library which provide web service call through c++ so that I can use it on Windows and Mac both the platform.
I wanted stubs that can be used on both Windows and Mac platform.
Could any one suggest me good library.
thanks
I would like to recommend gSoap. In the company I'm working at, we use it for about 7 years now (since version 2.6.0, the actual version is 2.8.3) and only made good experiences with it. Look at the success stories to get an overview of the companies which are using it.
Related:
C++ and SOAP
What is a good platform for devoloping web services in C++?
A Good C++ Library for SOAP
pion is a possibility, though I don't know how it compares to gSoap or other alternatives. I got it working an evening then got distracted with other reverse economies. I seem to remember it having fewer dependencies of the others I researched.
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I'm looking for free and easy GUI framework that let me create single exe
without dependency (like .Net framework) and to be not GPL
as a side note .. im using Qt and its great but i have to be LGPL to use it that means lots of fat dlls . is there any alternative?
p.s
how did the Dropbox client made of? i know its python but how did they build it? py2exe?
LGPL != GPL. You don't have to make your code LGPL or even make it open to use the library that is covered by this license. It is clarified in this post.
So if LGPL is suitable, then I recommend gtkmm.
AFAIK you can link statically with it.
Another options is wxWidgets which has slightly more liberal license.
As stated here you can create
"an .exe application that will run on any Windows platform with no external dependencies that need to be supplied by the developer" with it.
Also to let you know that from January 14, 2009, Qt version 4.5 is available under LGPL in addition to GPL and commercial license (see here).
What about Win32++?
http://win32-framework.sourceforge.net/index.htm
http://www.codeproject.com/KB/winsdk/framework.aspx
Or WTL?
I found another topic that might interest you
I'm looking for free and easy GUI framework that let me create single exe without dependency (like .Net framework) and to be not GPL
There is no such thing. Three most popular frameworks Qt, GTKmm, wxWidgets are LGPL.
However you can link statically and provide full source code that allows user to replace/update the LGPL part you can do this as it confirms to LGPL requirements
(I'm not a lawyer - don't see this as legal advice).
Now .Net - has lots of dependencies they are just pre-installed.
Now I used to distribute programs with Qt, it was very simple, you need very few dll's. In my case there were: QtCore4.dll, QtGUI4.dll and mingwm10.dll (that is just part of mingw and not Qt). It is not such big problem, so even it is not a single exe but it is simple enough.
Otherwise... Use Win32API -- good luck :-)!
Edit: as it was correctly commented by #vitaut you may even provide compiled objects letting user link the code and replace the Qt version to keep with LGPL requirements.
Or use
http://smartwin.sourceforge.net/
Not specifically C++, but:
AutoIt scripts can be compiled to self-contained executables.
Also consider Free Pascal and the Lazarus IDE which appears to offer the same end-goal.