@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

Hi @jsulm and @Paul-Colby,

if (segs) { delete[] segs; segs = nullptr; }

This is an anti-pattern! Just make sure segs is nullptr before you call new and set it to nullptr after delete. No need to check for nullptr before delete:

delete segs; segs = nullptr;

Quoting the C++ Reference:

"If this is a null-pointer, the function does nothing."

Regards

Hi
Not as far as i know.
You can use the MS ActiveX if you want (MSHTML)
http://doc.qt.io/qt-5/activeqt-activeqt-webbrowser-example.html
and other techs on the other platforms.

BTW, keep in mind that there is no such thing as "universal ref" in C++ standard. It's just a way of thinking about rvalue ref T&& in contexts which provide type deduction for T

mkdir build_qtspeech pushd build_qtspeech /path/to/Qt/bin/qmake /path/to/qtspeech/ make make install popd

@Valveware said in Promoting to custom widget in QtDesigner '*.hpp' no such file or directory [cmake]:

file(GLOB_RECURSE QT_MOC RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} FOLLOW_SYMLINKS include/dashboard/*.hpp)

Ok that looks like it would indeed moc your cameraframe.hpp.. So that's probably not the issue.

Can you share the build log from gcc? And also the ui_main_window.h file as well as ui_cameraframe.h?

@VRonin I don't doubt that Visual Studio can do this, my poins are

qmake doesn't have native way to set source-specific flags, you need to create your own custom target with all gory details of building C++ file, so it's much easier to move it into library I don't know if mixing EH flags in the same binary is reliable with MSVC

@Jerwinprabu Thank You. It is working fine now.

Did you have any system update happening in between ?

I think you have to add a QMultiSampleAntiAliasing to either a QRenderStateSet or a QRenderPassFilter. Did you also enable it in the OpenGL format that you set?

From the looks of it I would say there's somehow a mismatch with the C++ standard used and this stackoverflow answer goes in the same direction.

Thanks for your help.

It's an application that runs on a big screen that people will use standing up. So they will be using touch rather than a keyboard.

The reason for Windows 7 is that the application will need to attach to hardware, D2K-DASK http://www.adlinktech.com/PD/web/PD_detail.php?pid=350. The hardware drivers are only guaranteed for Windows 7 and 8. Its possible it might work on Windows 10 anyway but it's not clear.

Also, they want to use a touch number pad for number only entry. Not sure how much extra effort that would involve? I just found this artical http://www.cplusplus.com/forum/windows/128603/ , is ok?

@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!

The lib prefix should be dropped like @jsulm suggested.

Resolution:
The final puzzle piece was in the QML. I had to set the max x, y, z axis values appropriately for a polar graph which differed from the original square-image values.

axisX.min: 0 axisY.min: 0 axisZ.min: 0 axisX.max: 360 // [Degrees] axisY.max: 256 // Max data value axisZ.max: 90 // Max calculated radius

Final c++ was:

float xo = x - 64.0f; float zo = z - 64.0f; float radius {0.0f}; float angle {0.0f}; radius = std::hypot(xo, zo); angle = std::atan2(zo, xo) * (180/M_PI); angle +=90; angle = std::fmod(angle, 360); if (angle < 0.0) angle += 360; row[x] = QVector3D(angle, value, radius);

@Eeli-K Correct :-)
Wow i don't know if it good or bad that i just spent almost 2 days for less than 10 rows of code :-)

@Lasith You should open the database only once. Currently you do it each time button is pressed.

Hi,

There's no need for any global objects all the more if you only have one active connection for your application but it's also valid if you are managing multiple connections. The QSqlDatabase class already provides everything you need.

Like written in the documentation, if you are only using one connection, don't give it a name, it will become the default connection and all the SQL related classes will use it by default.

If you have several connections, it's easy to retrieve the one you are interested in by using QSqlDatabase::database.

On a side note, you should properly test the outcome of your open call. Right now it could be failing and you don't care about that possibility.