General and Desktop

• 

  How to create the plugin of MYSQL for Qt
  • BlackStar

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  @flydragon

  Do not duplicate posting because you do not get an answer immendiately.

  [edit:koahnig see https://forum.qt.io/topic/82629/why-qsqlquery-exec-exit-failed ]

• 

  Reporting inappropriate content on the forums
  spam • • Eddy

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  Thank you for the report. I have banned the user, which got rid of the spam posting. Not a loss, as this user did not post any other content on the site. Just deleting this one posting was not possible.

  Thanks for reporting this.

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  Unsolved update qsqlite and qtableview
  • Mogli123

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  @jsulm
  to updating everything it's ok, because the old data are not necessary after updating

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  Unsolved Timer Cannot Stop..?
  • PrAnit

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  @mrjj said in Timer Cannot Stop..?:

  calling stop() will remove the one-shot if not triggered yet.

  May be OP also failed to stop the timer set with setSingleShot ?

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  Unsolved Dynamic TableView (JSON & Qt)
  • NotYourFan

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  Unsolved How to compile Qt5Websockets and install it on my Qt folder installation?
  • lucaszanella

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  @Ratzz said in How to compile Qt5Websockets and install it on my Qt folder installation?:

  or try to build it https://github.com/qt/qtwebsockets

  @jsulm may be he should use this?

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  Class problem
  • Nafab213

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  What you did is wrong, that's shadowing the member variable. it should be:

  centralfencen = new QStackedWidget; centralfencen ->addWidget(new FenCene); centralfencen ->addWidget(new FenCenep);
• 

  Solved QModbusRtuSerialMaster issues with 5.12.x
  serialport modbus 5.12.1 5.12.0 msvc2015 • • J.Hilk

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  To be continued at bugreports.qt.io

  https://bugreports.qt.io/browse/QTBUG-73965

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  Solved TaskBar-Icon hidden when MainWindow hidden
  • Toby

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  @Toby I'm not sure why your login window does anything else than the log-in procedure. This doesn't sound like good design.

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  Unsolved when i complie my code with qt5.12.0 or qt5.12.1,it will prompt error，but other ver will not
  • jimfar

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  Hi,

  To add to @Ratzz finding, It's a compiler bug not a Qt bug.

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  Unsolved migrate old application
  • aminemaar

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  @aminemaar
  Yes.
  to some degree that will work.
  You could try
  https://doc.qt.io/qt-5/qtwebview-minibrowser-example.html
  and see how much just runs.

• 

  Unsolved StyleSheet inheritance through Visual-Tree!?
  • Boris1980

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  @Boris1980 said in StyleSheet inheritance through Visual-Tree!?:

  topic could be deleted

  Still not deleted :0

• 

  Unsolved OpenStreetMaps with QtWidgets/C++
  • MuratUrsavas

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  Thank you SGaist,

  I guess this would be the easiest way to do it. I'd have to write some QML code after a while.

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  Unsolved '_RemotableHandle' type error when trying to use ActiveX in Qt
  • Taytoo

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• 

  Unsolved how can i connection QSqlDatabase oracle with user shema?
  • Everton Fonseca

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  @Everton-Fonseca
  Something like mentioned here with overloads for QSqlDatabase::QSqlDatabase(const QString &type) as QOCI https://doc.qt.io/qt-5/sql-driver.html#qoci

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  Unsolved How should post data to API that has ContentTypeHeader:"text/plain; charset=utf-8" ?
  • zhmh

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  @SGaist am I get the correctly contentTypeheader
  With that link And am I use it correctly?

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  Unsolved Is there have relationship between QWidget and QWindow after QWindow pop up?
  • richie18

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  @SGaist

  Use code below as application A.
  When application A is poped up, click the 'block process' button in applicaiton A. Then application B's process is also blocked.

  # -*- coding: utf-8 -*- import sys from PyQt5.QtWidgets import QWidget, QApplication, QVBoxLayout, QPushButton class MyWidget(QWidget): def __init__(self, parent=None): super(MyWidget, self).__init__(parent) self.setWindowTitle("block application") layout = QVBoxLayout(self) blockBtn = QPushButton("block process") layout.addWidget(blockBtn) blockBtn.clicked.connect(self.block) self.resize(300, 200) def block(self): import time while True: print(time.time()) if __name__ == '__main__': app = QApplication(sys.argv) widget = MyWidget() widget.show() app.exec_()
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  Unsolved Smooth scaling QPixmap
  • patrickkidd

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• 

  Unsolved What calls paintGL
  • BKBK

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  @kshegunov said in What calls paintGL:

  @BKBK said in What calls paintGL:

  This is Qt3 using QGLWidget.

  This is a mistake, right? You don't mean 15+ years old code, I hope.

  Unfortunately, we are using Qt3. The government Information Protection team (name has been recently updated, I might not have the latest) has changed their rules about using code that is foreign owned. They hate that. And I have been told hate open source. Never did understand that. From what I have found Qt has always been foreign owned, but the rules changed since we started with Qt so we can keep what we have but cannot introduce the new stuff.
  A Royal PIA.

• 

  Unsolved Dynamically fit QComboBox popup height to the (dynamically changing) count of items
  qcombobox view resize qlistview item • • AloyseTech

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  @AloyseTech Agree my solution is complicated, your resizing code looks good, should work too. Don't know about the item height, but perhaps divide view()->window()->height() with # of items?

  Just guessing here, but couldn't you do something llke:

  hidePopup(); showPopup();

  to sort of "force" the QComboBox into good behavior?

  Edit: perhaps with a qApp->processEvents() sandwiched in between them....

• 

  Unsolved Are Qt Remote Objects supported by Webassembly
  • Martin

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  @raven-worx said in Are Qt Remote Objects supported by Webassembly:

  @hgerdau said in Are Qt Remote Objects supported by Webassembly:

  Than you could connect to any host bypassing the sandbox.

  Thats not how it works, as i said its only allowed to make connections to the host domain

  You are wrong. Same origin is forced only for tcp sockets but not for websockets.
  Please google for Same-Origin-Policy (SOP) and websockets.
  And by the way I have wasm code running that shows that it works with websockets.

• 

  Unsolved upgrade SDK on macOs Qt version
  • AmirAbbasi

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  @SGaist
  the code was run
  thanks a lot

• 

  Unsolved macdeployqt for a daemon process
  • vivian

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  No one has replied

• 

  [SOLVED] - QTableView - change cursor when hovering specific column
  • maximus

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  Hi and welcome to devnet,

  What version of Qt ?
  On what platform ?

• 

  QString::sprintf question
  • Eonz

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  @Morbius Both asprintf and fromWCharArray are static methods. Don't create temporary instances just to call them. Just use directly: QString::asprintf(... and QString::fromWCharArray(...

  You don't need std to use Unicode (and by Unicode I mean UTF-16, just to be clear, because there's more then one type of Unicode).
  QString is UTF-16 internally so there's no point in doing it via std::swprintf. Format string in QString::asprintf is expected to be UTF-8 so it can hold whatever UTF-16 can. If you have arguments that are UTF-16 strings then these are also supported directly via %lc and %ls.

• 

  Unsolved Running Qt Application from .dll
  • Theok

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  The .pro file looks correct.

  However, as suggested before, use consistent file naming. You have a widget called MainWindow, then you should have kept the original file name generated for you by Qt Creator. There's no need for any special naming because you are creating a library.

• 

  Unsolved Can I host QT based apps on DigitalOcean cloud servers.?
  • MariaWilliams

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  Hi and welcome to devnet,

  What exactly do you want to host there ?
  Is it the backend of your application ?
  The application itself ?

  On a side note, it's Qt. QT stands for Apple's QuickTime which is not what you are currently developing with.

• 

  Unsolved Main Project do not update after Static Library Change
  • mahd96

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  Hi,

  IIRC; you can use PRE_TARGETDEPS for that.

• 

  Unsolved QSortFilterProxyModel not mapping properly
  qsorfilterproxy qmodelindex itemmodel • • zmurphy

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  You can check you model implementation with the QAbstractItemModelTester. See this wiki entry.

• 

  Unsolved Manually Implementing Custom Widget in MainWindow
  source code custom widget circular dependencies • • Burke212

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  You can use designer or do it by code only. That's up to you.

  What strange errors do you get ?

• 

  Solved Error in HTTP request a URL and post data on it
  • isan

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  @Pablo-J.-Rogina thanks

• 

  Unsolved Building details
  • sheldon

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  Hi, welcome to the forum.

  You can open the "Compile Output" pane (Alt+4 on Windows or click on the tab on the bottom of the window). It shows all the invoked command lines and some timestamps so you can see what's compiling at the moment.

• 

  Unsolved Shortcuts problem in migration from QX11EmbedContainer to QWidget.createWindowContainer
  • devqore

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• 

  Solved What is the difference between macros Q_INVOKABLE and Q_PROPERTY?
  • Ronak5

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  @Ronak5 you may want to check some of the examples in the documentation about The Property System. You'll see usage of READ, WRITE and NOTIFY for instance.

  Q_PROPERTY(Priority priority READ priority WRITE setPriority NOTIFY priorityChanged)

  And for Q_INVOKABLE and following with that example, you could imagine a method applyPriority for example so if you apply Q_INVOKABLE to it, it could be called from some other C++ classes or even from QML as mentioned before.

• 

  Unsolved Problem with MySQL driver on mac
  • Albert Huert

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  Great !

  Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

• 

  Unsolved How to have the most updated QT libraries?
  • lucaszanella

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  @jsulm said in How to have the most updated QT libraries?:

  @lucaszanella Try to set -DCMAKE_PREFIX_PATH=PATH_TO_YOUR_QT_VERSION/lib/cmake before calling CMake

  Hi,

  The correct call is

  cmake -D CMAKE_PREFIX_PATH=PATH_TO_YOUR_QT_VERSION/lib/cmake /path/to/your_project
• 

  Unsolved Connect a checkbox widget to a line edit to appear when toggled box
  • AXNT

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  @AXNT and when you're back from solving "error: no member named ..." you may want to take a look at your method on_advSearch_toggled()

  ui->advSearch->setCheckable(true) for sure had happened before (hopefully in the auto-generated UI code because you checked "checkable" property for the QCheckBox widget when you placed it in the UI. No need to do that there. No need to connect(...) any signal from QCheckBox object to QLineEdit object.
  Just do (pseudo-code): ui->rmaEdit->setVisible(checked);

  this way when the on_advSearch_toggled() method is called because the user checked or unchecked the box, the QLineEdit widget will be visible (checked is true) or not visible (checked is false)

  PS: next time, please don't paste an image of your code, just surround it with the code tag (icon </>) to get something like this, that you'll fill out with your code snippet...

  ``` //your code here ```
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  Unsolved qt map import or display map
  • s002wjh

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  thx, ill take a look at

• 

  Unsolved How draw customize toolbar button in QT
  • Aleskey

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  Hi and welcome to the forums
  The normal QToolButton can do it.
  You need
  a icon and use
  https://doc.qt.io/qt-5/qtoolbutton.html#setMenu
  to give it the popup menu
  and for building the menu you want to set
  setCheckable(true) for the QAction you give to menu if you need the checkmark feature.

• 

  Unsolved QLocalSocket doesn't emit readyRead
  • Ananym

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  Welp. That works fine.
  And when I amended it so the server sends its response inside readyRead, that works fine.
  And when I changed the sending/receiving method to match the more explicit serialization my wrapper uses, that - frustratingly - worked fine.

  Hm! I hope to test it with the same wrapper library I had been using but integrating it is going to take me some time to stumble around. The server application I'm adding to already has quite a busy event loop, so it's hard to say what else might play into it. Thanks a lot for your help, having such an elegant minimal solution does make things easier and this goes a long way to exclude possible factors.