@jsulm
thanks for you reply! it is work! thanks again!

@danielheise said in Qt5.0 Graphics acceleration improvement:

Generally speaking what visual performance improves might be gained by moving to Qt5.0+? I understand this is quite the loaded question on several fronts.

I assume that you have widgets-based kiosk application where almost everything is done by Q(Graphics)WebView. In this case, moving to Qt 5.x may be very important for you because it allows you to use newer WebKit.

If your application allows browsing untrusted content, e.g. arbitrary web sites, using older WebKit may be dangerous because of unfixed security vulnerabilities In addition to security matters, QtWebKit 5.212 is much more compatible with moder Web content than older versions Even if you have control over the content that you disaply in your "browser", using newer WebKit allows you to use modern Web technologies like ES6, new HTML and CSS features etc.

Now about "hardware graphics acceleration". It's possible with both Qt 4 and Qt 5. In Qt 4, hardware accelerated graphics is possible with DirectFB or platform-specific QWS plugins. You also can use OpenGL, in this case you need to use QGraphicsWebView with QGLWidget viewport (in Qt 5 there is newer QOpenGLWidget).

I re-built the file system image, this time with Buildroot-2017.02 and Qt version 5.6.2.

I ran, on the target board, the audiooutput example that Qt provides and got a lots of pulseaudio warnings.

Remembering the above QT_DEBUG_PLUGINS hint, I took a look inside the /usr/lib/qt/plugins/audio directory on the target board and found two plugins: libqtmedia_pulse.so and libqtaudio_alsa.so .

Removing the libqtmedia_pulse.so plugin solved the race condition with libqtaudio_alsa.so and solved the problem.

In addition, make sure that alsa-lib builds before qt5multimedia (commit 8d7dd837e5e from mainline Buildroot: "qt5multimedia: conditionally add alsa-lib to dependencies").

Please have a look at the bug report I just submitted on this issue: https://bugreports.qt.io/browse/QTBUG-61059

@SGaist : Unfortunately we live in an imperfect world.
Thanks for your help - much appreciated.

I will mark this post as solved, even though it's not really, but I have no more time to spend on this.

Hi, if you're not having that many different rows/layouts, say 3: flavor A, flavor B, flavor C, flavor A again, you could do it using spanned columns http://doc.qt.io/qt-5/qtableview.html#setSpan

For example, in one of my healthcare/insurance apps, I use that to implement 2 different width schemas in my QTableWidget, screen shot here:

@SGaist thank you for that! That took care of the qtquickcontrols2. Now I just have a hand full of other modules I need to build and install, according to these errors:

/Live3DWidget.qml:4 module "QtQuick.Scene3D" is not installed /Live3DWidget.qml:9 module "Qt3D.Extras" is not installed /Live3DWidget.qml:7 module "Qt3D.Render" is not installed /Live3DWidget.qml:6 module "Qt3D.Core" is not installed /Live3DWidget.qml:8 module "Qt3D.Input" is not installed /Live3DWidget.qml:4 module "QtQuick.Scene3D" is not installed /Live3DWidget.qml:9 module "Qt3D.Extras" is not installed /Live3DWidget.qml:7 module "Qt3D.Render" is not installed /Live3DWidget.qml:6 module "Qt3D.Core" is not installed /Live3DWidget.qml:8 module "Qt3D.Input" is not installed /Live3DWidget.qml:4 module "QtQuick.Scene3D" is not installed /Live3DWidget.qml:9 module "Qt3D.Extras" is not installed /Live3DWidget.qml:7 module "Qt3D.Render" is not installed /Live3DWidget.qml:6 module "Qt3D.Core" is not installed /Live3DWidget.qml:8 module "Qt3D.Input" is not installed /Live3DWidget.qml:4 module "QtQuick.Scene3D" is not installed /Live3DWidget.qml:9 module "Qt3D.Extras" is not installed /Live3DWidget.qml:7 module "Qt3D.Render" is not installed /Live3DWidget.qml:6 module "Qt3D.Core" is not installed /Live3DWidget.qml:8 module "Qt3D.Input" is not installed /Live3DWidget.qml:4 module "QtQuick.Scene3D" is not installed /Live3DWidget.qml:9 module "Qt3D.Extras" is not installed /Live3DWidget.qml:7 module "Qt3D.Render" is not installed /Live3DWidget.qml:6 module "Qt3D.Core" is not installed /Live3DWidget.qml:8 module "Qt3D.Input" is not installed

I will try to install relevant modules and try again. Will report back.

Do you have a commericial license? The DataVisualization module was only added to the open source license (GPL) in Qt 5.7. Also, how did you install Qt? Using the online installer/maintenance tool, the examples are in sub-directories by version (e.g., C:/Qt/Examples/Qt-5.6), but yours doesn't not seem to use the versioned sub-directories structure.

You have here a list of the modules and their state.

QtWebkit as been deprecated and removed.
QtQuick1 as been deprecated and removed

You can still build them from sources but you have to clone them specifically.

@raven-worx
ah right, couldn't be easier. :)
Maybe I'll come up with another solution for my issue like subclassing and repainting the tabbar. For now that'll do the trick.
Cheers

Hi,

Check the version of gstreamer that the plugin uses. It could be 0.1. In that case the quick and dirty way is to install that version of gstreamer with the corresponding plugin packages.

Hope it helps

I also use a QQmlComponent for loading a qml file. I use this file for the application settings (i exploit the QmlEngine for this so I can get away easy with creating my settings files as if they were qml files).

m_mcdeSettingsComponent(new QQmlComponent(m_settingsEngine, this)); m_mcdeSettingsComponent->loadUrl(QUrl::fromLocalFile(QApplication::applicationDirPath() + QDir::separator() + "config.rc"), QQmlComponent::Asynchronous); void Core::onSettingsComponentStatusChanged(const QQmlComponent::Status &status) { ... ... // here i create my component with: if (status == QQmlComponent::Ready) { m_mcdeSettingsComponent->create(); // other operations ... } else { ... } }

Seeing as i load them both at the same time (the settings and the quickview) could it be that for some reason they mess up with each other?

SOLUTION: i added the "projectToSecondScreen" call at the end of the loading of the QQmlComponent i use for loading my qml plugins i use and all is well. The QQuickView is correctly created and shown.
( or load the QQmlComponent with QQmlCompnent::PreferSynchronous)

QUESTION
Why does this error occur? What happens during the loading of the QQmlComponent that messes up the loading of the QQuickView if done simultaneously?

@QtExchange said in Segmentation fault or overflow when streaming from a QSerialPort:

The trick is one QByteArray receives the data (on signal slot basis)

QByteArray can receive nothing, it's an array of bytes - a container, nothing more, nothing less.

where the other container (which is just a copy of the receiver-QByteArray) is parsing the received Data, as the symbols come in a random order.

??!
How can you parse something that doesn't have any order? And where is this other container?

I could think of having an extra signal-slot that exchanges the data between both containers whenever it is demanded, but it sounds like I have to double check if I'm actually dealing with the most current data.

I don't follow. Why would be this even needed ...?

There's an extra mutex for the device access, and another one for the shared message container.

Qt imposes thread affinity on QObject instances, you don't need a mutex for device access, and you shouldn't share the message container.

and because I'm dealing with QElapsedTimer, that needs the thread.

In what universe QElapsedTimer needs a thread ...?! It's like saying that an integer needs a thread ... I don't get it.

Hi and welcome to devnet,

What kind of transformation do you have ing mind ?

Well in this case I have about 20 qml files.

I have just solved the problem. I did as you said. The things were going fine, but the error was still exist. Therefore, I tried to find the source of the problem. In makefiles of the program what I am dealing with, the library links are referred as

libQtMultimedia

However, in my library location there is no library exactly the same name. There is :

libQt5Multimedia

So, I redefined it in makefile, and the problem is solved.

Thanks for your helps..

@VRonin

With the provided code the whole dropdown list will be invisible. Do you know how to keep the items unaffected?

@raven-worx
Jackpot! Thank you so much for your help!! Finally I did it using QFileSystemWatcher.
Thumbs up for you (if possible?!). :)

Thread marked as solved.
Cheers

@M4RZB4Ni
Hi,
From what I see here it probably died with Qt 4. I have such code, but it's proprietary, so I can't share, sorry. You can implement it yourself though.

You'd need the QtSerialPort module to communicate with the device and implement a limited subset of the AT communication protocol. After configuring the port and the modem, you basically issue +CMGS to send a message. While you can retrieve the SMS messages on the modem with +CMGL.

Kind regards.

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@SGaist According to comments in the bug report the posted code should work in qt 5.6.1, and I have been able to verify this is indeed the case. So I guess I should consider this question as 'answered' then. Thanx for the help

@VRonin Thanks for the answer.
Just to be sure, this is my output when I run otool -L on my .app
Does that look ok?

@executable_path/../Frameworks/libopencv_core.3.1.dylib (compatibility version 3.1.0, current version 3.1.0) @executable_path/../Frameworks/libopencv_imgcodecs.3.1.dylib (compatibility version 3.1.0, current version 3.1.0) @executable_path/../Frameworks/libopencv_highgui.3.1.dylib (compatibility version 3.1.0, current version 3.1.0) @executable_path/../Frameworks/libopencv_imgproc.3.1.dylib (compatibility version 3.1.0, current version 3.1.0) @executable_path/../Frameworks/libopencv_objdetect.3.1.dylib (compatibility version 3.1.0, current version 3.1.0) @rpath/QtWidgets.framework/Versions/5/QtWidgets (compatibility version 5.6.0, current version 5.6.0) @rpath/QtGui.framework/Versions/5/QtGui (compatibility version 5.6.0, current version 5.6.0) @rpath/QtCore.framework/Versions/5/QtCore (compatibility version 5.6.0, current version 5.6.0) /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0) /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 120.1.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1226.10.1)

Hi,

Just a quick note, taking a look at fixing this "fix", I just saw that the latest version of the contrib repository doesn't contain the offending code anymore.

AFAIK, if you have udev, you should get device detection for your application.

@Zondar Hi! No, there is no API for that. In this thread (https://forum.qt.io/topic/62977) people discuss how to do it via Android's API.

@SGaist I finally threw away my whole QT source folder and started once more from scratch and now the modules and libraries are back in sync as 5.6.1.

Marking this as solved. Thanks

Only advise I can give to everyone that runs into this as well is:
Check if your library and modules are in sync. They seem to have gotten out of sync for me after using git update or branch switch.

I don't think you can use /usr/bin/gdb to debug Android apps.
Did you try to add the debugger manually?

Filed a bug report at https://bugreports.qt.io/browse/QTBUG-53054.