Seperation of Concerns (SoC):
https://en.wikipedia.org/wiki/Separation_of_concerns

There are design approaches that go further, but SoC is a good place to start.

@SGaist I am not using Labview's serial port directly because of my code contain many background functionalities. It will take time to implement all in Labview. We want to just give readable data and few User interface to Labview. So user can directly use readable value and interface in Labview.

@HW-Developer
OK, I don't want to discourage you, maybe you just want to play with it, I've said I have no knowledge. But maybe if that sort of thing was freely available from 2005 there are some more recent ones which might be better?

@A123 said in New Errors when moving C++ code to QT Creator:

its been used by others for years and it worked perfectly AFAIK with gcc and clang before I started using qtcreator which complained.

Here's my guess: Previously, the assert() macro was disabled. This caused the illegal code to be effectively "commented out", so the compiler didn't detect it. After the migration, the assert() macro was no longer disabled, so the compiler now sees the bad code and (correctly) complains.

See http://www.cplusplus.com/reference/cassert/assert/. You could make your code work again by defining the NDEBUG macro, but be careful: This will disable all assert()s which might cause other errors to go undetected.

P.S. The compiler is the one that complained, not Qt Creator.

@Cute3d, yes, it finally works. Idk what was wrong. Example project:https://github.com/Nonmant/Qt3DExtras-QText2DEntity-Example
And due to god-knows-what reasons it doesn't work in debug mode. Hope, that project can help someone.

Are you implementing technique number 4 described here ?

Fill all results of checked check boxes into a list, and then take the first n entries from that list (up to the number you need, or the size of the list)
EDIT: If you put the checkboxes into a container, you just have to loop over it

@GrecKo You're right! I am defenetly doing some kind of Game of Life)
I've managed to create a map, using GridView and QAbstractListModel like in this video.
I also understood how to pass values using model's roles. Now I'm trying to find out how to pass user defined classes through QVariant. I guess i also should register my 'Cell' class with qmlRegisterType<>

@jsulm Ok! I will make sure to read all the links you've given me. Thanks for the help!

What's the problem replacing the QSpinBox with a QComboBox in the example? Did you even try?

Do you mean custom graphicsView or tableView? If custom graphics view wouldn't it be too hard to reimplement everything? Any links or example would help.

Another update :) I just tried static linking with Qt Creator based on Qt 5.11.1 (MSVC 2015, 32 bit) and it works. I can compile the application with static linking just by adding static to the config file.
Which kind of tells us, that from building qt with static linking from source everything is fine, just that something is definitely wrong with Qt VS Tools. so it kind of closes another corner for us.

Are you sure you ran the correct version of windeployqt ? If you use the tool from the mingw folder for an app that was compiled with MSVC you'll end up with the wrong files and libaries inside your deploy directory.

@zespy , hello!
I've been trying to do exactly same thing - print text with QText2DEntity.
And, unfortunately, that code doesn't work for me. I've been variating all parameters for a while and haven't reach any result - just nothing appears on screene.
Is it possible to add any other example or\and example project?

And thank's you for this thread, it's still biggest conversation about QText2DEntity usage

Thanks, I will check!

@SGaist , thanks

@mohammad_palwala shouldn't you asked in some FSUIPC mailing list? Your issue seems not related to Qt...

By build a debug version do you mean adding -DDEBUG -g to CFLAGS in my makefile?
Hooray! Adding the -DDEBUG -g flags to my makefile fixed it!
Thank you @aha_1980! I googled for this but nothing really came up, thanks!

@Nico1564 said in How to draw on Image loaded in a QGraphicsView:

Yeah i know that this work but i need to draw with fonctions. I successed to do that but I don't want to have the GraphicsView at the beginning of the program, and i want to add draws like an Ellipse (and the image) when i click on buttons.

These lines could just as well happen inside a button click

QGraphicsEllipseItem* testItem = new QGraphicsEllipseItem(20,30,120,70,0); m_pScene->addItem(testItem);

In that case, you would create an ellipse every time you pressed that button.

I don't quite understand the "I don't want to have the GraphicsView at the beginning of the program" - maybe you could elaborate on that.

@wilke18

please see here: http://doc.qt.io/qtcreator/creator-project-wizards.html

I got the answer . MainWindow.cpp is like that

ui->listWidget->setFlow(QListView::LeftToRight); ui->listWidget->setMinimumSize(1050,800); ui->listWidget->setGridSize(QSize(340, 320)); ui->listWidget->setResizeMode(QListView::Adjust); ui->listWidget->setViewMode(QListView::ListMode); ui->listWidget->setWrapping(true); QDir directory = QFileDialog::getExistingDirectory(this, tr("Open Directory"),"/home", QFileDialog::ShowDirsOnly| QFileDialog::DontResolveSymlinks); directory.setNameFilters({"*.mp4" , "*.avi" , "*.flv" , "*.mwv"}); for(const QFileInfo & finfo: directory.entryInfoList()){ QMediaPlayer *mediaPlayer = new QMediaPlayer(); mediaPlayer->setMedia(QUrl::fromLocalFile(finfo.absoluteFilePath())); videoItem = new QGraphicsVideoItem; videoItem->setSize(QSize(300,240)); QGraphicsScene *scene = new QGraphicsScene(this); QGraphicsView *graphicsView = new QGraphicsView(scene); mediaPlayer->setVideoOutput(videoItem); QPushButton *m_playButton = new QPushButton(); m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); connect(m_playButton, &QAbstractButton::clicked, [mediaPlayer]() { switch (mediaPlayer->state()) { case QMediaPlayer::PlayingState: mediaPlayer->pause(); break; default: mediaPlayer->play(); break; } }); connect(mediaPlayer, &QMediaPlayer::stateChanged, [m_playButton, this](QMediaPlayer::State state) { switch(state) { case QMediaPlayer::PlayingState: m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause)); break; default: m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay)); break; } }); QSlider *m_positionSlider = new QSlider(Qt::Horizontal,this); m_positionSlider->setRange(0,mediaPlayer->duration() / 1000); connect(mediaPlayer, &QMediaPlayer::positionChanged ,[m_positionSlider, this](qint64 position){ m_positionSlider->setValue(position); }); connect(mediaPlayer, &QMediaPlayer::durationChanged ,[m_positionSlider, this](qint64 duration){ m_positionSlider->setRange(0,duration); }); connect(m_positionSlider ,&QAbstractSlider::sliderMoved, [mediaPlayer ,this] (int position){ mediaPlayer->setPosition(position); }); auto item = new QListWidgetItem("", ui->listWidget); auto widget = new QWidget; auto label = new QLabel(finfo.fileName()); auto vb = new QVBoxLayout; QBoxLayout *controlLayout = new QHBoxLayout; controlLayout->setMargin(0); controlLayout->addWidget(m_playButton); controlLayout->addWidget(m_positionSlider); vb->addWidget(label); vb->addWidget(graphicsView); vb->addLayout(controlLayout); widget->setLayout(vb); widget->setMinimumSize(320, 320); ui->listWidget->setItemWidget(item,widget); player.append(mediaPlayer); scene->addItem(videoItem); }

@dheerendra said in QWebEngineView doesn't work with paid proxy.:

Since authentication is required, did you catch the signal proxyAuthenticationRequired from webEngine page ?

I know now, that i have to use connect method to catch this signal, but i don't know, what do i have to do after.

Thanks. Ended up really using mediainfo, got it with the following method

int getVideoDuration(std::string fileName){ MediaInfo MI; MI.Open(fileName); int duration = std::stoi(MI.Get(Stream_General, 0, "Duration")); MI.Close(); return duration; }

Hi
fast sample.
it need error handling to be useful in real code ! ( dont skip that if for a real program)

#include <QApplication> #include <QDebug> #include <QJsonDocument> #include <QJsonObject> #include <QNetworkReply> #include <QNetworkAccessManager> int main(int argc, char* argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); // if in mainwindow. make sure m_manager lives in .h as member. else it wont work. ( death by scope) QNetworkAccessManager m_manager; // make request QNetworkRequest request = QNetworkRequest(QUrl("https://api.bitmart.com/ticker/BMX_ETH")); QNetworkReply* reply = m_manager.get(request); // connect to signal when its done using lambda) QObject::connect(reply, &QNetworkReply::finished, [reply]() { // read data QString ReplyText = reply->readAll(); // qDebug() << ReplyText; // ask doc to parse it QJsonDocument doc = QJsonDocument::fromJson(ReplyText.toUtf8()); // we know first element in file is object, to try to ask for such QJsonObject obj = doc.object(); // ask object for value QJsonValue value = obj.value(QString("bid_1")); qDebug() << "Bid value is" << value.toString();; reply->deleteLater(); // make sure to clean up }); return a.exec(); }

and it outputs
Bid value is "0.000290"

Just by loading one page and coming back, we can't make out the memory leak. Try multiple times like this. If you see a increase & no decrease then we can conclude memory leak. If you can send me the complete example, we can try as well.

Same problem here with Qt 5.11.0 without ssl, happening with Visual 2015 but not Visual 2017, only when Qt is configured as -static and -debug, with or without -static-runtime :
call C:.conan_nwtri\1\qtremoteobjects\tools\repc\qlalr_wrapper.bat C:.conan\2sjrgr\1\qt5\qtremoteobjects\src\repparser\parser.g
NMAKE : fatal error U1077: 'call' : return code '0x3'
Stop.

I have add C:\mysql\mysql-5.7.21-winx64\lib into path variable. but don't work!

@wrosecrans
Hoping I can get an answer from the mailing list. As soon as I figure it out I will post the solution here.

@nour.m

if you mean here:
http://freetexthost.com/l5wzgtntzb
than no, you did not make the changes @aha_1980 told you to do

SOURCES += main.cpp mainwindow.cpp my_polyhedron.cpp myqglwidget.cpp HEADERS += mainwindow.h My_CGAL_Config.h My_Face_base.h My_Halfedge_base.h my_polyhedron.h My_Vertex_base.h myqglwidget.h

still mising \ at the end of the line

also you are adding the widgets module twice. I'm not sure in what that will result, but you should remove one

QT += core gui QT += widgets //remove me DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x000000 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

@hassene
Hi and welcome
Is there a reason you simply dont use a layout ?
To make it autofollow the size of window ?
if you place a QLabel on a form ( mainwindow.ui) , right click somewhere on
empty form, and select Layout menu and select layout, the label will follow maniform.
https://doc.qt.io/qt-5.10/examples-layouts.html

@Maluna34 maybe the qrc file mechanism is not the best approach for what you intend to use; however you only know your actual requirements.
From documentation about Qt resource system:

The Qt resource system is a platform-independent mechanism for storing binary files in the application's executable. This is useful if your application always needs a certain set of files (icons, translation files, etc.) and you don't want to run the risk of losing the files.

so a music file for a whole opera concert is not a suitable candidate for being stored in the qrc file as it ends up into your executable.

Given that said, you could get the file from the resource and save it somewhere to disk so the external tool can access it.

QFile::copy(":/sounds/ocean.mp3", "/tmp/ocean.mp3");

you can even use QTemporaryFile to avoid worrying about file naming and deletion.

Please show the complete code you are using for that part.

Hi,

AFAIK, PNG doesn't contain the same meta data so you won't be able to use QExifImageHader to read them.

Hi
Just as note.
You should do it in same shell
(start x server)
export DISPLAY=:0.0; /path/app