Sorry, I meant for video encoding.

In any case, I would separate the streaming and the preview if possible. Generating the network stream for one or more device can be very heavy CPU wise.

Hi,

You should start your application with the QT_DEBUG_PLUGINS environment variable set to 1. It should show more information with regard to plugin loading.

Hi and welcome to devnet,

AFAIK, there's no such list. Distributions may provide tray icon through different means and some patches Qt to support their custom system.

Did you try on these distribution with their own versions of Qt to see how it's working ?

The only drawback is that 3rd-party modules cannot depend on one another unless they are submitted for inclusion in the core pool of modules. But it seems like this is just the price to pay for this kind of system?

Sorry for the long delay, I was traveling and had no time to actually look at the forum.
Yes, I would say that your summary is correct, and in that light I'd say what @VRonin had suggested as a way to build up the dependencies is probably best. That is - you have a set of core libraries that provide whatever they provide (which was what @SGaist mentioned in passing) and you stick to runtime loaded plugins being self-contained units that can't and/or won't depend on one another.

@anp405, my first guess would be that by setting PYTHONPATH you are losing the location of PyQt5 package. This depends on your Python and environment setup, but if there is some PYTHONPATH existing, you are overriding it completely instead of complementing. You can verify this by opening a new command line session, setting PYTHONPATH to wherever your code sets it, then running Python interpreter and trying to import PyQt5.

Another guess would be that your child process uses different Python environment (e.g. built-in system Python 2), which does not have PyQt5 installed in its site-packages.

One thing you can try is to use the "-I" and "-L" options of the configure script passing there the paths to your MySQL include and library folder.

@DSpider great! please don't forget to mark your post as solved. Thanks.

@JonB @MrShawn

Thanks you two for clarifying.

After downloading/installing a MySQL server in a school computer, I could build/run my app on my computer and insert/update data successfully to the server. That part's all good. Thanks from y'all.

Marking as solved.

You should only use -developer-build is you plant to contribute to Qt. If you're building for yourself, there is no need to add that flag.

Why do you have your plugins and application all in the same project ?

Thanks for your input, the problem was that the DLL was actually not in the place where it should have been, my mistake.

SOLUTION

with the help of @mrjj i found solution. It's just that instructions were not clear on tutorial

Steps

get the Qt creator source : git clone --recursive https://code.qt.io/qt-creator/qt-creator.git

set qmake version . your qmake version should be close to the qt version you are using . for e.g. if you are building for 5.10 your qmake should also use 5.10.

you can set qmake version by

sudo mv /usr/lib/x86_64-linux-gnu/qt-default/qtchooser/default.conf /usr/lib/x86_64-linux-gnu/qt-default/qtchooser/default.conf_orig sudo vim /usr/share/qtchooser/my_Qt_5.10.0_Desktop_gcc_x64.conf <Qt_dir>/5.10.0/gcc_64/bin <Qt_dir>/5.10.0/gcc_64/lib ln -s /usr/share/qtchooser/my_Qt_5.10.0_Destop_gcc_x64.conf /usr/lib/x86_64-linux-gnu/qt-default/qtchooser/default.conf

check qmake by qmake --version

mkdir qt-creator-build
cd qt-creator-build
qmake ../qt-creator/qtcreator.pro

4. ``` cd qt-creator-build make qmake_all make -j <number-of-cpu-cores+1>

wait for some time . it will take long time to build.

now you have both source and build of Qt creator . Now just follow the wizard and point the qt soruce and build locations

build and run

voila !! \0/

@kshegunov yes that is exactly what I was wondering. I was not sure if plugins can be loaded into other C++ plugins or not. I will give this a shot.

@SGaist good point about creating a library. I think isolating the communication API into a dynamic library would be an even better solution as you suggested. I will have to do some refactoring.

Thank you both for sharing the quick and helpful response!

Hi
Also for my first attempt i used
http://doc.qt.io/qt-5/qtwidgets-tools-echoplugin-example.html

which is pretty small and easy to understand.

I've been trying to find the same solution... and have come across the same issues.

QGIS can show WMS maps via Qt. So in theory you could pull apart its source, but then you're dealing with GPL issues.

Has anyone written a WMS plugin and published it?