@Sivamani-V said in How to connect to mysql server in ubuntu 16.04?.:

QMYSQL Driver not loaded. Available drivers: QMYSQL QSQLITE QMYSQL3

This gets asked so many times, here & elsewhere. Googling for your message will bring up many hits. Under Linux/Ubuntu it's usually libmysqlclient or libqt5sql5-mysql or similar which is missing/has dependencies missing/wrong version.

The idea is that you have your container widget getting resized and in its resize event, you change the size of the inner widgets with the ratio you want.

we can change the rgb values of each point in a cloud

I resolve it.

I setted font of text as property of QML Text component.
(Like font.family : parent.fontfamily)

and on Qt 5.7's QML, there are no enough options to control font properties.

so, I moved to C++ side and set a whole application font.

QFont font = someClass.getLangFont();
//set property of font instance here
// such as hinting policy, style etc.
QApplication::setFont(font);

now it looks very cleary...

thank you..

Hi,
got it done.

ui->lineEdit->setFocus(); QKeyEvent *key_press = new QKeyEvent(QKeyEvent::KeyPress, Qt::Key_X, Qt::NoModifier, "x"); QApplication::sendEvent(ui->lineEdit, key_pre..ss);

the last parameter "x"

My bad, I misread from where the signal came from.

Did you try to determine why they don't appear ?

@Devopia53
it works! , Thanks alot

@GregWilsonLindberg
I think that the g++ version is what is doing it. The old version of rasbian
is using g++ v4.9.2. The new version of rasbian is using g++ v6.3.0-18+.
For the old compiler we had had to add an "INCLUDEPATH =
/usr/include" line into the .pro file to get everything picked up
properly. For the new compiler (and the change from #include to #include_next
in cstdlib) that messes up.
I'm removing the INCLUDEPATH, (which seems to have been included as -isystem
instead of -I) and that is fixing the problem.

I'll try out soon Samsung S8 plus Samsung DeX
Samsung DeX is connected to a HD Monitor via HDMI and apps running on S8 are automatically running on this external monitor as soon as S8 is placed into the DeX dock.

will my QtQuickControls2 APP run under this environment ?
will the change of DPI and size work ?

I'll let you know ...

@Swapnil_Shelke
To create those kind of buttons you need more than CSS.
You must go into button's paintEvent and then draw what you need (there are 3 simultaneous animation BTW) :

#include <QtCore/qvariantanimation.h> #include <QtCore/qvariant.h> #include <QtWidgets/qabstractbutton.h> #include <QtWidgets/qapplication.h> #include <QtWidgets/qlayout.h> class Animation : public QVariantAnimation { Q_OBJECT public: Animation(QObject *parent = 0) :QVariantAnimation(parent) { setTargetWidget(qobject_cast<QWidget*>(parent)); setAutoUpdateEnable(true); } void setAutoUpdateEnable(bool a) { if (targetWidget()) { a ? QObject::connect(this, SIGNAL(valueChanged(QVariant)), targetWidget(), SLOT(update())) : QObject::disconnect(this, SIGNAL(valueChanged(QVariant)), targetWidget(), SLOT(update())); } } QWidget *targetWidget() const { return _target; } void setTargetWidget(QWidget *w) { _target = w; } QVariant value() const { return _value; } void setValue(const QVariant &variant) { if (_value == variant) return; _value = variant; } protected: void updateCurrentValue(const QVariant &value) override { setValue(value); } private: QVariant _value; QWidget *_target = nullptr; }; class SampleButton :public QAbstractButton { public: struct ButtonStyle { qreal border_radius = 4.0; QColor background_color = QColor("#f4511e"); QColor text_color = QColor("#ffffff"); int font_size = 28; QString font_family = "Arial"; int width = 200; int padding = 20; qreal hover_padding = 25; int duration = 600; QIcon icon = QIcon("next.png"); // http://www.flaticon.com/free-icon/double-angle-pointing-to-right_25358 @16x16 qreal pixmap_padding = 20; }; SampleButton(const QString &text, QWidget *parent = 0) :QAbstractButton(parent), _textEff(new Animation(this)), _pixmapEff0(new Animation(this)), _pixmapEff1(new Animation(this)) { setFont(QFont(_st.font_family, _st.font_size)); setText(text); } QSize sizeHint() const override { return QSize(_st.width, _st.padding + fontMetrics().height() + _st.padding); } protected: void paintEvent(QPaintEvent *) override { QPainter p(this); // draw background p.setPen(Qt::NoPen); p.setBrush(_st.background_color); p.setRenderHint(QPainter::Antialiasing, true); p.drawRoundedRect(rect(), _st.border_radius, _st.border_radius); p.setRenderHint(QPainter::Antialiasing, false); // draw text if (!text().isEmpty()) { p.setFont(font()); p.setPen(_st.text_color); p.setRenderHint(QPainter::TextAntialiasing, true); p.drawText(QRectF(rect().x() - _textEff->value().toReal(), rect().y(), rect().width(), rect().height()), Qt::AlignCenter, text()); p.setRenderHint(QPainter::TextAntialiasing, false); } // draw icon if (!_st.icon.isNull()) { p.setRenderHint(QPainter::SmoothPixmapTransform, true); auto s = _st.icon.availableSizes().at(0); p.setOpacity(_pixmapEff0->value().toReal()); p.drawPixmap(QPointF(rect().right() - (_st.pixmap_padding * 2) - _pixmapEff1->value().toReal(), rect().center().y() - s.width() / 4), _st.icon.pixmap(s)); } } void enterEvent(QEvent *e) { _textEff->setStartValue(0.0); _textEff->setEndValue(_st.hover_padding); _textEff->setDuration(_st.duration); _textEff->setEasingCurve(QEasingCurve::OutCubic); _textEff->start(); _pixmapEff0->setStartValue(0.0); _pixmapEff0->setEndValue(1.0); _pixmapEff0->setDuration(_st.duration); _pixmapEff0->setEasingCurve(_textEff->easingCurve()); _pixmapEff0->start(); _pixmapEff1->setStartValue(0.0); _pixmapEff1->setEndValue(_st.pixmap_padding); _pixmapEff1->setDuration(_st.duration); _pixmapEff1->setEasingCurve(_textEff->easingCurve()); _pixmapEff1->start(); QWidget::enterEvent(e); } void leaveEvent(QEvent *e) { _textEff->setStartValue(_st.hover_padding); _textEff->setEndValue(0.0); _textEff->setDuration(_st.duration); _textEff->start(); _pixmapEff0->setStartValue(1.0); _pixmapEff0->setEndValue(0.0); _pixmapEff0->setDuration(_st.duration); _pixmapEff0->start(); _pixmapEff1->setStartValue(_st.pixmap_padding); _pixmapEff1->setEndValue(0.0); _pixmapEff1->setDuration(_st.duration); _pixmapEff1->setEasingCurve(_textEff->easingCurve()); _pixmapEff1->start(); QWidget::leaveEvent(e); } private: ButtonStyle _st; Animation *_textEff = nullptr; Animation *_pixmapEff0 = nullptr; Animation *_pixmapEff1 = nullptr; }; int main(int argc, char *argv[]) { QApplication app(argc, argv); QWidget *dialog = new QWidget; dialog->setWindowFlags(Qt::FramelessWindowHint); QHBoxLayout _Layout; dialog->setLayout(&_Layout); SampleButton *sb = new SampleButton("Hover"); _Layout.addWidget(sb); dialog->show(); return app.exec(); } #include "main.moc"

@Swapnil_Shelke

Happy to see that it helped you,

You are welcome =)

You could go and set all other widgets to disabled

void QWidget::setDisabled(bool disable)

convenient enough, if you have a good Layouttree

Isn't this the same issue as here https://forum.qt.io/topic/75821/qabstractsocket-unknownsocketerror-provides-errorstring-of-unknownerror?

Ok... if I change the files gl2.h, gl2ext.h and gl2platform.h (from OGRE/RenderSystems/GLES2) for the ones that come with Android-NDK the error disappears.

@CybeX
yes, I have the same problem sometimes.
I just uncheck it and check it again then run the program and it will work.

@yuvaram

If so, compile it with Network Download Example, which is officially available from Qt.

Original SO thread

@Chris-Kawa

It would actually just make things easier.

I would like to generalize this procedure to e.g.

QFile::copy(":/my/file", r.OriginalFileName);

Here Qresource::OriginalFileName() returns the original file name e.g. somefile.txt

Now, I am required to (for each file):

QString newLocation = QString(tempdir + tempdir.seperator() + QString("myNewFileName.txt")); QFile::copy(":/my/file", newLocation);

It just seems tedious and not very efficient.

But thanks for clearing it up though,

*grabs coffee

I didn't wrote that there was any problem with your webcam, just that the backend used might not implement these parameters.

You can check which backend is loaded by setting the "Q_DEBUG_PLUGINS" environment variable to 1 in the Run part of the Project panel in Qt Creator.

Here is a possible solution for solving this "missing check/mark" issue.

I implemented the CSS "indicator" solution I got from this qt form post which is problematic.

Sources of solution:

Doc page: here Implementation: here QPalette p = ui->checkBox->palette(); p.setColor(QPalette::Active, QPalette::Base, QColor(255, 255, 255)); p.setColor(QPalette::Button, QColor(255, 255, 255)); ui->checkBox->setAutoFillBackground(true); ui->checkBox->setPalette(p); QColor(255, 255, 255)

refers to your desired background color, possibly the same color as your window background, etc.

QPallete::Active, QPalette::base

refers to the active checkbox's background (the white box background)

QPalette::Button

refers to the "actual background" (behind the checkbox and the checkbox text)

Hope this helps!

@mit_cruze Unless I missed something, it's highly unlikely that building Qt 5.12.0 with the options you passed ended in installing it in /usr/local/Qt-5.7.1.

@mr_max I also have the same issue..Is it working now?

Well, 5.7.0 was Qt3D's first official release, and the code hasn't matured as much as the other modules, so some bumps along the road are expected. My biggest beef with Qt3D actually is its very thin documentation, but I'm sure that'll improve with time.:)

@raven-worx : I've got an answer from BogDan Vatra, in fact Ministro does not support Qt 5.7.x
This is why nothing works when generating APK with Ministro.

Qt5.7.x support will be added some time later. This is a bad news for me... I can't wait for a Ministro update.

So I found a workaround, I give it here, perhaps this could help someone else.

I have create a APK with Qt lib included, in release mode but not signed.
From this APK, which is in fact a ZIP archive, I've extract all Qt specific stuff:

assets/--Added-by-androiddeployqt--/* lib/armeabi-v7a/libplugins_* lib/armeabi-v7a/libqml_* lib/armeabi-v7a/libQt5* lib/armeabi-v7a/libgnustl_shared

I copy those files on device, into internal storage.
Then, I generate new APK (same configuration: release, with Qt libs and not signed).
To generate the update APK, I remove from this the Qt specific stuff (so APK size is now less than 2MB).
I transfer this APK on device, on device side I insert missed Qt libs into.
Then I start APK installation on device.

This a very dirty way to do it, but it WorksForMe(TM)

You'll love KDE. It has always been one of my favorites. Plus the close integration with Qt makes it even better.

I've used gnome a lot lately too though. A lot of people hated the new Gnome 3 changes, but I didn't mind them.

It's not as full featured or nice as KDE though. But sometimes KDE acts a little weird due to some of the opengl stuff.

And if all else fails, you can try arch. It isn't an easy to set up distribution but it's cutting edge. So everything is the newest of the new. Makes for a lot cooler of a linux experience in my opinion. :)

Setup is not for the faint of heart though. There's no GUI, and I usually use a linux boot disk to get it going (one from sysreccd).

@SGaist
is VS express not excotic enough ? ;)

Thanks @jpnurmi,

This is exactly what i was looking for, all my issues are solved.

i have a same problem, and have not solve yet

Hi
Normally you use signals and slots.
Like when TcpServer got a connection it calls a slot in mainwindow.
You set it up with connect.

http://doc.qt.io/qt-5/signalsandslots.html

http://www.bogotobogo.com/Qt/Qt5_QTcpServer_Client_Server.php
http://www.bogotobogo.com/Qt/Qt5_QTcpServer_Multithreaded_Client_Server.php

Hi,

AFAIK, yes, you need to set them in your widget constructor.

Hi there,

I have some experience in software development (about 30+ years or so), and never ever was your question leading...

First choose what devices your app should be running on
Then decide if your app has enough "reusable" things to even start thinking about models
If not, don't use any model at all! It will only cost you more time. Don't let the "hype" trick you!

However, if ur app is supposed to work on several different devices, and the output of your app may be in different kinds of forms, THEN, and only THEN, start thinking about how to generalize the view of ur app to the different kinds of users...

And also ofcourse, If you plan to make many apps, some parts may be common. And Yes, in that case you start worying about reusability.

But NEVER!!!
NEVER EVER!!!
Worry about UI, before u have thought about ur app first:

What it should do

How it should do it

What UI should be the LAST of ur problems...

Now, having sayd that, there is always "Prototyping" to engage the end users in the look and feel of the app in as early a stage as possible of course, but it NEVER should be leading to a change of architecture.

Hi!

You should get the error-message as already mentioned above:

QSqlQuery a; if( !a.exec("Select Stock From Manufacturer_stock Where Product='Parle';") ) { qDebug() << "Error:" << a.lastError().text(); }

@p3c0

Thanks a Lot.

As you said, I will use the profiler now and then.