The Lounge

Our March meetup session materials are now available.
This time, the workshop aim was to discover the Qt.controls.labs. This time, I didn't create a new project for the workshop but used the Gallery example.

@ JKSH...

That's not quite accurate. In fact, I currently use MinGW-64 along with Code::Blocks to develop cross-platform apps which work on both my Windows 10 and Ubuntu systems. I have to change some compiler parameter settings in the Code::Blocks IDE, make a few changes to the make file, then recompile for each different OS. But I use the same compiler and don't have to make any changes to my code.

https://sourceforge.net/p/mingw-w64/wiki2/CrossQuickstart/

I'm quite happy with Code::Blocks and MinGW-64. I was just curious to learn more about the Qt libraries and to see if I might like them better than the xWidgets libraries for GUI development.

While MinGW-64 was a beast to configure for use with Code::Blocks as well, I have a friend set it up for me the first time and she made screen shots of the entire process. Pictures are worth a thousand words, so any time I have to re-install Code::Blocks I just follow the pictures and in about 2 minutes all works perfectly.

But I suppose my question was answered earlier. I've pretty much come to the conclusion that Qt will do what I need, at least not without time-consuming rebuilds or workarounds, and that I should stick with the familiarity of Code::Blocks, Xojo, and Lazarus for cross-platform development, and Visual Studio (C++ and VB.NET) for WIndows only development.

@Sajad-Manal what about this? it looks some guys in Finland are pursuing similar goals. Good luck!

another useful editor for dataflow programming Qt: FloDiEdi
https://sourceforge.net/projects/flodiedi/?source=directory

http://blog.qt.io/blog/2016/02/16/the-qt-company-joins-khronos-group-and-promotes-vulkan/

@tomy
You might be the only one seeing the bookmark, AFAIK it is local.
Therefore probably nobody is going find and answer your specific question.

Even though it is not strongly encouraged in this forum, I suggest that you are starting a new thread with a title already giving an understanding of your problems.

Check this out: http://doc.qt.io/qt-5/qtwidgets-richtext-syntaxhighlighter-example.html

You're welcome !

Don't hesitate to ask them in separated threads (don't forget to search the forum though, there are already a lot of questions related to the RPi) :)

If you're not lost anymore, please mark the thread as solved using the "Topic Tool" button so that other forum uses may know a solution has been found :)

I'm pretty sure it can't be done on a person to person basis, but a poll could be done.

@qDebug
That sounds strange. I don't have FF 43 anymore, so can't test. But it should really not depend on the browser, plus FF 43 is a recent version.
(I just changed your question to a question)

One good way to learn about Qt is to attend training. Here is a link to some scheduled events organized by The Qt Company: http://www.qt.io/events/

In addition, several other companies organize training events around the world. For example, here is a link to some events organized by KDAB: http://www.kdab.com/training/schedule/

Yes, we do read these forums.

Yes, all platforms do not support everything possible, but you do realise that every single platform is evolving all the time and trying to keep up with them on all the details is hard work. Hard work that the developers of Qt are doing pretty well.
(I agree with Bluetooth being a pain, as I'm trying to write something with it myself. Luckily the platforms I want to run on have pretty good support.)

Next the legal questions.
You also need to understand that I have zero hours of law school or training, so getting a comment from me about licenses in third party app stores is like asking a random person on the street. Add to that the fact that some people will take anything as legal advice, and the result is that we do not really like to say anything out here.

As a general guide; and do not mistake this for legal advice, this is a random dude on the internet rambling about licenses.
I have not read what the Apple app store texts say currently, but the text used to be hostile toward open source licenses (again stress on the part where I have not read it recently, I hear they are softening the text).
Google has been more simple in the past, where LGPL Qt has been quite ok, there is even ministro that can handle the libraries for you.
So it's Apple that has been in the gray area where people without a legal degree can't say anything in any direction.

Then again, if you comply with the GPL/LGPL in providing the source/object files when someone asks, you are ok. (except if the Apple agreement says something else)

We do have a commercial option for small business coming out this spring still. The cost will be in line with what a small business / indie developer can afford. So nothing like the 350$/month you found (which is probably about correct for a pro app development license).

So assuming you want to do commercial apps, you can do open source and be prepared to give object / source files depending on the license you go with, or you can get a commercial license. Again assuming you are a small business / indie developer I suggest you wait a bit for the small business license that we have coming out in roughly the Qt 5.6 release timeframe.

Thanks for the tip.

We'll check unixstickers out and see if we can work with them. It looks like we would be in good company there.

Qt like 'cute' :)

In my opinion, it is the cleanest and most elegant C++ framework there is.
It might be hard initially, but it is quite easy to become familiar with it after that because of the consistent architecture - you almost know how to use something as it is very much like what you would expect. :)

@Alkaris said:

What is the standard environment PATHs for Qt and everything it uses?

Short answer: There is no such thing as "standard environment PATHs for Qt and everything it uses".

Long answer: Please note the following:

The environment variables set by QtChooser is for building applications, not for running applications. QtChooser is not the tool you're interested in, since it does not affect how applications load Qt. The place where an application searches for Qt is determined by one or more of these things: (i) how the application itself was built and packaged, (ii) ldconfig, and/or (iii) distro-specific settings. Qt has no control over any of these 3 factors. Qt itself does not require any environment variables. Your system is the one that requires environment variables.

You would have better luck if you had asked the Linux Mint community, since your problem is a question of "How does this system help applications find the libraries they need?".

You say to dynamically link the ones I want to use, but I need to know the default environment PATHs so I can point applications to it.

@Wieland suggested that you use ldconfig. You don't need to know or set any PATHs to follow it.

There are many places to learn ldconfig, including http://codeyarns.com/2014/01/14/how-to-add-library-directory-to-ldconfig-cache/

I know you have now found a solution of your own, but do realize there are multiple ways to get your system to work.

it's not something I broke, the whole Qt package itself came broke, blame the maintainer of the package provider https://launchpad.net/~beineri/+archive/ubuntu/opt-qt551 that's where I got the qt55 from in the first place.

That's an unofficial package created by an Ubuntu community member. It was not created by the Qt Project or by Canonical (the company that maintains Ubuntu).

We understand that you're annoyed and frustrated. But that is no excuse to take it out on the people here.

eventually figured it out and fixed it on my own after messing around trying out a few things.

Glad to hear.

pretty much as long as you are dynamically linking with the libraries or are running open source software, it doesn't cost any money. for android and for linux this is totally allowed. for ios you cant put dynamic linked software on the app store, so you would have to pay 200$ for the license.

Thanks man

Thank you for your reply.