Language Bindings

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  Solved how can I use c ++ not qt QUICK / QML?
  • Nathan Miguel

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  @sierdzio said in how can I use c ++ not qt QUICK / QML?:

  engine.rootContext()->setContextProperty("cpuname", &CpuName);

  its works tnks

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  Unsolved Pysyde/QTableView: openPersistentEditor works only once?
  • dammilo

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  modelReset should be emit after endResetMode.

  What version of PySide are you using ?

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  Solved How to I get cpu description and cpu name
  • Nathan Miguel

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  Something like lspci -vnn | grep VGA ?

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  Solved Emitting and handling signals with GoLang and QML respectively.
  • Nikhilesh N

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  @SGaist Thank you, Samuel. I will definetely try it out.
  Marking this topic as solved.

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  Unsolved Qt and cmake issue
  • jpitz3131

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  Unsolved Compiling static Fortran library Qt
  • Jakub Srna

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  Guess that this is caused by the set flags.

  I don't know.

  Can I include that somehow as I know it optimizes the code more?

  Fortran uses C-linkage so any linker should be able to manage it.
  Note that fortran mandates decoration of the function names itself, because reasons. So if you have:

  subroutine dummy() end subroutine dummy

  This is seen by the linker as if it was defined as void dummy_().
  If you intend to call fortran from C, you must provide the proper declarations for the compiler in your C code, they can't be deduced automatically.

  When I use either gfortran or ifort in my code and I'll try to do the cross compilation. Will the fortran part of the code run flawlessly on Mac or Linux?

  As long as you configure the compiler properly, you can treat fortran code as any other C code, so it should work fine, yes.

  Tangent:
  gfortran, I believe, still transpiles the fortran source to C and then runs the C compiler on top of it. In the end why should anyone invest time into keeping a real compiler for a zombie language up to date ...

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  Unsolved Qt GUI with Eclipse c++
  • GastonMelo

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  I'd recommend reading the Qt5 version: https://doc.qt.io/qt-5/signalsandslots.html

  @GastonMelo You really should take the time to go through Qt's documentation. It's full of tutorials, getting started guides and it also explains all the core concepts provided within the framework.

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  Solved Shiboken - Building bindings with headers in subfolders
  • snkaupe

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  Hi,

  Thanks for the feedback ! Can you post the link to said patch ?

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  Unsolved Using QImageCleanupFunction with PySide2
  • laan

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  Hi,

  Good question. What does your function look like ?

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  PyQt5: Invisible items in a QML ListView (perhaps a bug?)
  • MazeChaZer

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  @JonB Thanks

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  Unsolved QDateTimeAxis not shown in QChartView
  • Zeeshan Mehmood

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  Solved Python/PyQt/PySide - How to add an argument to derived class's constructor
  • JonB

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  Just to close this up. Although I posted this question here, to the the PyQt mailing list and on stackoverflow, since I never got an actual answer as to how to write the derived class's constructor to accept the new positional argument while retaining all the existing overloads, in the end I have actually gone for a named argument:

  class JListWidgetItem(QtWidgets.QListWidgetItem): def __init__(self, *args, value: typing.Any=None, **kwargs): super().__init__(*args, **kwargs) # optional `value` member, passed in as `value=...`, stored in data(Qt.UserRole) # this is a common thing to want, cf. `QComboBox.itemData()` if value is not None: self.setValue(value)

  and caller goes e.g. JListWidgetItem("text", value=1). Some people have said this is the more "pythonic" way, who knows, but at least it works! Thanks to all.

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  Unsolved PySide2 - How to prevent crashing when running multi-threaded calculations then plotting the emitted results
  • AndrewF

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  The first thing you should do is to make Worker inherit both QObject and QRunnable. QObject must come first. Making it a separated class and calling signals on it is wrong. Signals should be emitted from within the class that defines them.

  Another thing is that you don't set your worker to auto delete so you will end up eating lots of memories depending on how many times plot is called.

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  Unsolved Web Assembly and decalarative-camera example.
  • Julian Guarin 0

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  @Julian-Guarin-0 said in Web Assembly and decalarative-camera example.:

  So I guess you are right. Does this confirm what you did see?

  as i said, i didnt see anything ;)
  But the configure clearly shows that you might only be possible to play sound files, i don't know if thats really true though for QtWebAssembly.

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  This topic is deleted!
  • thippu

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  Unsolved Pyside QLineEdit entering data from right-to-left
  • Joel Graff

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  @aha_1980 said in Pyside QLineEdit entering data from right-to-left:

  @Joel-Graff your example does not look like valid float number.
  Do you need exponential format? I'm not sure, if QDoubleSpinbox provides that, otherwise it would be first choice for that task. For the line edit, you could use input masks or hook up an own 'correction function' on every key press.

  It is, in fact, a valid float. It's called a "station" where 1 station = 100 feet. Thus 999 feet = 9.99 stations, which is commonly annotated 9+99. It's really just a length. The example I gave is actually the input mask I'm using - sorry for the confusion. The problem is, the input mask doesn't really fill out the required placeholders correctly. That is, if I create an input mask that reads:

  '00009+99.00;_'

  I would expect it to show

  ____0+00.__

  as a default. Of course, it doesn't, and I admit, I don't really know much about input masks in Qt.

  Since I can't rely on the input mask to control the data entry, forcing it to enter data from the right (and push the characters to the left) seems the next best option. It's a fairly common data entry technique - I've seen it even in very old terminal-based systems. I was hoping I didn't have to craft my own callback to manage it.

  Thanks anyway. :)

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  Qt compatibility with VHDL source codes??
  • Pallu

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  @aha_1980 thanks.
  They can add it to the gallery if they like, but the plugin is still work in progress.

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  How to make QAbstractTableModel 's data checkable
  • redstoneleo

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  a minimized example

  import sys from PySide2.QtWidgets import * from PySide2.QtCore import * from PySide2.QtGui import * from PySide2.QtSql import * class MyModel(QSqlTableModel): def __init__(self, parent=None): super().__init__(parent) self._checked = [[False for i in range(self.columnCount())] for j in range(self.rowCount())] def rowCount(self, parent=QModelIndex()): return 2 def columnCount(self, parent=QModelIndex()): return 3 def data(self, index, role): if (role == Qt.DisplayRole): return "Row{}, Column{}".format(index.row() + 1, index.column() + 1) elif role == Qt.CheckStateRole: print('data(self, index, role)-------------', index.data()) return self._checked[index.row()][index.column()] # show CheckBox's check state return None # be sure to return super().data(index, role) if worked with QSqlTableModel; def flags(self, index): return super().flags(index) | Qt.ItemIsUserCheckable def setData(self, index, value, role): # implement the setData() method to allow for the check state to change if role == Qt.CheckStateRole: print(value) self._checked[index.row()][index.column()] = value # CheckBox's check state depends on the value return True # Returns true if the value could be set return False # be sure to return super().setData(index, value, role) if worked with QSqlTableModel;Returns true if value is equal to the current value. However, the value will not be submitted to the database.; if __name__ == '__main__': app = QApplication(sys.argv) tableView = QTableView() myModel = MyModel(None) tableView.setModel(myModel) tableView.show() sys.exit(app.exec_())
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  Solved QIODevice::read (QProcess): device not open
  • FoxBandyKoot

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  **My first problem has been resolved, so I will close this, and open a topic for my new problem.

  For future people who come to this topic : The solution for "Device not open" was to use "start function" instead of "execute function".

  Thank you people for helping me.**

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  Unsolved What's the state of perl bindings for Qt5
  • daveh

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  Did you also check this https://cgit.kde.org/perlqt.git ?

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  Unsolved How to install and use pyqt5
  • aidanikuz

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  @aidanikuz please watch following video to install and use pyqt5

  https://www.youtube.com/watch?v=yqHiOesB-nI

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  Unsolved Garbled when compiling JAVA
  • ArcherLiang

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  yes.
  I guess it might be encoding problem . I set the UTF8 encoding in the options,but it didn't solve the problem.
  Platform:
  QT version :Android for armeabi-v7a (GCC 4.9, Qt 5.9.3 for Android armv7)
  OS: windows 10
  Qtcreator version: 4.7.2
  Compilers: Android gcc arm-4.9, JDK1.8
  Thanks.

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  Unsolved Use Qt for gui frontend for Java jar
  • blue34

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  @blue34 I haven't tried grpc before. It uses protocol buffers though which I have used and aren't a bad way of doing things.

  I've never much cared for RPC mechanisms but whatever is easy for you to get implemented in the C++ side and the Java side is a decent way to do things. :)

  Like I said I always go the other way... native c++ library with the front end in java (android) and ios (objc). I've been trying out djinni for that lately and it makes the jni and what not nice and easy. Wrong direction though so that won't help you out much.

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  Unsolved Can C functions send data to QT Slots in QT5.7 ?
  • vivekyuvan

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  @vivekyuvan

  As @sierdzio already said, you cannot directly call C++ from C, and therefore you cannot use Qt.. But it is possible to write a wrapper, like discussed here: https://stackoverflow.com/questions/3583353/calling-c-class-member-function-from-c-code

  From within the C++ class, you can access all kind of Qt stuff again.

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  Unsolved Slots execution order and catching menu/action clicks
  • voltron

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  I can't explain difference between case 2) and 3).

  However, what you see in 1) is that signal-slot connections are always executed in order in which connections were made (hint: don't depend on this, though). So, when you connect in your plugin, you always do it after main program already had connected it's signals and slots - and thus your slots are executed after main program's, too.

  Then in 3) you get immediate execution because (probably) there was no connection made in main program for that particular triggered() signal - you are first in queue.

  Why 2) and 3) show different behaviour - I don't know.

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  Unsolved How to pass string value from dialog to mainwindow
  • dancaer69

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  @dancaer69
  @SGaist is (of course!) right. To expand on what he says:

  "use signals and slots": in the dialog, use emit() to raise a signal once the value has been set. In your main window module, use connect() to register a slot defined there which will receive the string passed in the signal by the dialog.

  "have your dialog provide getters to retrieve the values you want": from main window create your dialog instance, then execute it, then while the dialog variable is still in scope you can call functions in it to retrieve values:

  dlg = QDialog(self) if dlg.exec(): value = dlg.someFunction()

  In this case, do not set the Qt "auto delete dialog object after executing" flag (it is not normally switched on).

  Either method is acceptable, with pros & cons. Both are preferable to using a "global variable" (which you will find pretty difficult/non-obvious in Python anyway).

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  This topic is deleted!
  • nik0la.vr

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  Unsolved PySide2 QQmlApplicationEngine No Window
  • ruchitinfushion

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  Have you doublechecked how things should be run inside Maya?

  I suggest you try running the code as a standalone Python QT app first. For that, your code will need to also instantiate a QApplication object and then run the _exec method on it. That may actually be the reason why you're seeing nothing...

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  Unsolved Treeview / QSortFilterProxyModel rendering problem..
  • Kelv1n

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  @JonB @SGaist Thanks for taking the time to reply. Sorry I've done a bad job of explaining.. The issue is not with the scanning or sorting at scan time.

  I'm using a QRunner thread which recursively scans the directory tree, then creates QStandardItem for each file/directory/symlink and puts them into a QStandardItemModel, which is associated with a QTreeView - The scanning and initial sorting (whilst scanning) work perfectly fine.

  Cnce scanning is complete, a user can use the column headers to change the sorting (i.e. via Name or Type), if I rely upon the default sorting, it causes the UI to freeze whilst the sort is processed. If I use a QSortFilterProxyModel, this freezing does not happen (UI remains interactive and sort is much quicker), but, the problem is, I'm getting the on-selection glitch that I showed above (if I scroll the tree or resize the window, it forces a redraw and fixes it self).

  I would provide the code.. but, it's a hell of a mess (this is not my day job, I'm just experimenting/playing in the evenings)

  I've come to the conclusion its a bug / anomaly as I've got the same issue with both PyQT5 and PySide2.. So think I'm going to put this to bed, and move onto something else.

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  Unsolved RTTI requirement for PySide2
  • random_ascii

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  I don't know if you opened this bug: https://bugreports.qt.io/browse/PYSIDE-819
  but there is already a patch being reviewed related to a RTTI issue and WebEngine in PySide2, maybe we can continue the discussion there or maybe you can certainly open a new report

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  Unsolved Qt and QtPy in one program
  • Freddykong

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  I don't know if I got the question right,
  but the kind of interaction you describe could be possible by "extending" and existing Qt/C++ application to use Qt/Python code.

  Take a look at this example: https://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/scriptableapplication
  There, there is a Qt/C++ Window that shows some Python code which you can run and interact with the Qt/C++ object itself.

  Please be aware that many things need to be consider, and that you must handle the embedded Python and generate Python bindings for your Qt/C++ potion of code that you want to interact with.

  Another use-case which was based on that example, is the research that is currently on-going regarding extending QtCreator with Python:
  https://blog.qt.io/blog/2018/08/15/python-extensions/

  I hope those cases are in the same direction as your question.

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  Unsolved PYSIDE2 Style
  • tonyhnz

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  Yes, it's supported.
  You can take a look at the following example which passes the --style argument.
  http://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/declarative/textproperties/main.py

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  Unsolved Problem running pyside2 example in Linux
  • vyau

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  Hello,
  do you have some logs related to the build process?
  It seems to me that there is a mismatch between Qt and PySide2 versions.

  Which version of Qt did you use?
  and which branch of PySide2?

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  Solved Problems with installing pyside2 on linux
  • vyau

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  What mistake was it ? It might be useful for other people having the same trouble as you.

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  Solved Problem With JSON value type of data
  • Daniziz

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  Hi @sierdzio

  Thanks for the reply!

  The API already sends IDs in both formats: int (or double) and string.

  If that is the case I will use strings in my code.

  Thank you very much.

  Regards.

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  Unsolved Draw the QPushButton on the widget embedded with libvlc - MacOS
  • myxingkong

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  From what's on the report, QtQuick would be a better choice for the UI in that case.

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  Unsolved Dynamic locale change
  • spanara

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  @spanara
  I would assume you will have to do your steps --- how else would the button know to change its text?

  But with your "many widgets" you should not have to write code for each widget to handle this/update itself. You should be able to loop over all of them doing the updates in one go.

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  Unsolved PYQT5 - Populating Model from Thread / Sorting large Tree advice
  • Kelv1n

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  PyQt is a wrapper on top of Qt, what happens within the Qt classes is on the C++ side.

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  Unsolved Passing arguments from PySide2 to QML.
  • pleaseHelpSteve

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  @pleaseHelpSteve: What worked for me is using QStringModel as described here https://stackoverflow.com/questions/50609986/how-to-connect-python-and-qml-with-pyside2 (or here http://doc.qt.io/qt-5/qtquick-modelviewsdata-cppmodels.html)

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  Unsolved QThread Freezes GUI
  pyside2 qthread pyqt5 • • GLaDOS1105

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  Hi,

  Looks like there's some problem with the PySide 2 implementation. You should check the bug report system to see if it's something known. If not, please consider opening a new report providing your example and as much details as possible about your current setup.