By writing a small demo to complete my post, I found the issue. As it might be helpful to somebody else, here it is:

demo.scxml:

<?xml version="1.0" encoding="UTF-8"?> <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" binding="early" xmlns:qt="http://www.qt.io/2015/02/scxml-ext" name="plop.scxml" qt:editorversion="4.7.1"> <state id="State_1"> <qt:editorinfo scenegeometry="144.50;162.05;84.50;112.05;120;100" geometry="144.50;162.05;-60;-50;120;100"/> </state> </scxml>

demo.py:

#!/usr/bin/env python import sys from PySide2.QtCore import QObject, QCoreApplication, SLOT, Slot from PySide2.QtScxml import QScxmlStateMachine class Backend_1(QObject): def __init__(self, machine): super(Backend_1, self).__init__() self.machine = machine self.machine.connectToState("State_1", self, SLOT("s1_active(bool)")) @Slot(bool) def s1_active(self, active): if active: print('Backend_1::State_1: enter') self.submachine = QScxmlStateMachine.fromFile('demo.scxml') b = Backend_2(self.submachine) self.submachine.start() else: print('Backend_1::State_1: exit') class Backend_2(QObject): def __init__(self, machine): super(Backend_2, self).__init__() self.machine = machine self.machine.connectToState("State_1", self, SLOT("s1_active(bool)")) @Slot(bool) def s1_active(self, active): if active: print('Backend_2::State_1: enter') else: print('Backend_2::State_1: exit') if __name__ == '__main__': app = QCoreApplication(sys.argv) machine = QScxmlStateMachine.fromFile('demo.scxml') b = Backend_1(machine) machine.start() sys.exit(app.exec_())

If you run this, you expect to see:
Backend_1::State_1: enter
Backend_2::State_1: enter

But, the second statemachine does not seem to start. To fix it, you need to store the instance of Backend_2 (eg: self.b = Backend_2(self.submachine)). I guess it was garbage collected, so all the states/events connections were broken.

Meanwhile, if you think my design patter is bad, I'm willing to learn :)

Hi,

You are replacing the central widget in OpenVTK. You should rather add your widget to the current central widget's layout.

A quick google search with PyQt5 layout gives that nice article.

@jazzycamel said in Picamera significant delay and low FPS, but low CPU and memory usage:

Thanks this worked i also changed the camera parameters so it runs even faster.

self._camera=PiCamera(sensor_mode=4,resolution='640x480',framerate=40).

Now the only problem is when i try to capture using the worker thread is not responding to the signal ,this is also happening with the stop function its not responding to a button click or custom emit signal to stop the camera it just keeps running

@pyqtSlot() def snapshot(self): self._looping=False self._camera.capture('image.jpg') self._looping=True stopcamera = pyqtSignal() self._thread = QThread() self.stopcamera.connect(self._camera.stop) self._thread.start() self.CameraSnap.clicked.connect(self._camera.snapshot) self.CameraBack.clicked.connect(self.functionstopcamera) def functionstopcamera(self): self.stopcamera.emit()

@Xenoshell
There is literally like one occurrence on the whole of the Interweb of your error in vainfo (va_openDriver() returns -1)!
https://bugs.launchpad.net/ubuntu/+source/libva-utils/+bug/1719150
It was suggested:

Please install mesa-va-drivers and try gain.

I suggest you try that.... :)

@gizalp
Why do you think python (or anything else) is going to open any terminal window? And what OS are you on anyway?

For QProcess:setProgram you should have process.setProgram("python");, only. But in this case I think it's getting overridden by your process.start("python test.py"); so it doesn't matter, but it's wrong.

If you want to grab a sub-process's output, you have to handle QProcess::readyReadStandardOutput(), and in there something like QByteArray QProcess::readAllStandardOutput(), if that's what you mean by "How can I get the 'Hello' output?".

How this relates to Trying to implement thumbnail list I have no idea....

Yeah i feel like i do sudo apt-get update && upgrade at least once a day. I just checked about SIP and i compiled it from source but i cant remember if i actually used the command make and make install. Does that mean i have to reinstall pyqt5 again? I guess i just open a new thread. Thanks for all the help @SGaist

@gizalp said in Qt Signal Slot:

@mostefa Thanks, that fixed my problem!

You are welcome =)

What behaviour do you get with QSplitter ?

There's nothing wrong with GET request, since it has no payload, just a header.
Problems begin with POST.

Server side is pretty simple, with one exception: it sends HTTP reply header ASAP and THEN launches CGI script.

Here is a Wireshark dump of an interconnection with python server: http://umod47.ru/qtfail.pcapng

Hey @m-sue , thanks for your reply.

The problem isn't that cursor.movePosition(QTextCursor.NextCharacter) does not move the cursor, but rather that self.setHtml() sends the cursor to the end regardless of its current position. This does not explain why self.setTextCursor(cursor) has no effect.

IIRC something like:

ui.filters.currentTextChanged.connect(proxyModel.setFilterFixedString)

separate QTreeWidget in a QTreeView and a QStandardItemModel. create a QSortFilterProxyModel and set the QStandardItemModel as its suorce model connect currentTextChanged from the combobox to setFilterFixedString of QSortFilterProxyModel

A quick google search returns this article which covers most aspects of this subject.

Well, there is nothing wrong about sharing preferences. But it's doesn't matter.
We are using kubuntu 12.04 and PyQt-4.10.484.4.

For now, I do windowB.activateWindow() when my mouse enters windowA but it's a bit limited and I don't really like it.

@jsulm
thanks for you reply! it is work! thanks again!

@SGaist

Hello SGaist, thanks a lot for your explanation. It works great!

@SGaist Thanks for the reply! Not sure why, but this line in addNewSourceFolder did it;

item.setSizeHint(picwidget.sizeHint())

@Goffer Well, without code it is hard to help...

Thanks, SGaist.
QtSingleApplicaiton is an alternative solution to singleton , I will make a try.

Hello @Wieland,

In my case, I am integrating my interface as a plugin in QGIS. So, when closing all the windows and launching from QGIS, the main window is displayed. I don't really know If I need to destroy in this case.
Thanks for your reply.

Problem solved with mooving to PyQtGraph. Thanks for help.
Vlado

import pyqtgraph as pg OUT_Buffer_Time = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26] # 26 spominskih mest OUT_Buffer_Zg = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] # 26 spominskih mest OUT_Buffer_Sp = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] # 26 spominskih mest def simple_graph(): H = pg.plot(OUT_Buffer_Time, OUT_Buffer_Zg, pen='b') H.plot(OUT_Buffer_Time, OUT_Buffer_Zg, pen=(255, 0, 0)) H.plot(OUT_Buffer_Time, OUT_Buffer_Sp, pen=(0, 255, 200))

@Technologist
Which python and mingw version do you use?

Hello @mrjj :

In my main window, I call to launch my pop-up window :

def show(self): self.project.load() if self.project.tranus_project: self.tranus_folder.setText(self.project.tranus_project.path) self.activate_launch_button() self.launch_options_TRANUS() super(OptionsTRANUSDialog, self).show() ...... def launch_options_TRANUS(self): self.get_checked_list() if self.checked_list != [] : dialog = launch_tranus_dialog.LaunchTRANUSDialog(self.checked_list,self.folder,self.tranus_binaries,parent=self) dialog.show() result = dialog.exec_() self.reinitialise_checked_list()

The class of my pop-up window is defined as :

class LaunchTRANUSDialog(QtGui.QDialog, FORM_CLASS): def __init__(self,checked_list,project_directory,tranus_bin_path,parent=None): """Constructor.""" super(LaunchTRANUSDialog, self).__init__(parent) self.setupUi(self) self.project = parent.project self.proj = QgsProject.instance() self.tranus_bin_path = tranus_bin_path self.project_directory = project_directory self.project = parent.project self.checked_list = checked_list self.is_all_checked = False self.tabs = self.findChild(QtGui.QTabWidget, 'tabWidget') self.proj = QgsProject.instance() #control actions self.tabs.blockSignals(True) self.tabs.currentChanged.connect(self.onChange) self.tabs.blockSignals(False) def show(self): self.put_tabs() super(LaunchTRANUSDialog, self).show()

@mrjj
no, a callback is just the nomenclature you use to describe functions passed as arguments to other functions to be invoked later.

Hi,

QSignalMapper might be what you are looking for.

Hello,

It was an other problem that causes this problem. So, I solved and now it works.

Thanks .

For more information, here is the error that I get : Couldn't load plugin OptionsTRANUS due to an error when calling its classFactory() method

ImportError: cannot import name OptionsTRANUSDialog Traceback (most recent call last): File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 333, in startPlugin plugins[packageName] = package.classFactory(iface) File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS__init__.py", line 34, in classFactory from .Options_TRANUS import OptionsTRANUS File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 607, in _import mod = _builtin_import(name, globals, locals, fromlist, level) File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\Options_TRANUS.py", line 30, in from .OptionsTRANUS_project import OptionsTRANUSProject File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 607, in _import mod = _builtin_import(name, globals, locals, fromlist, level) File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\OptionsTRANUS_project.py", line 24, in from .Options_TRANUS_dialog import OptionsTRANUSDialog File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 607, in _import mod = _builtin_import(name, globals, locals, fromlist, level) File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\Options_TRANUS_dialog.py", line 29, in from .launch_tranus_dialog import LaunchTRANUSDialog File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 607, in _import mod = _builtin_import(name, globals, locals, fromlist, level) File "C:/Users/emna/.qgis2/python/plugins\OptionsTRANUS\launch_tranus_dialog.py", line 7, in from .Options_TRANUS_dialog import OptionsTRANUSDialog ImportError: cannot import name OptionsTRANUSDialog

Python version: 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] QGIS version: 2.18.3 Las Palmas, 77b8c3d

Python Path: C:/OSGEO4~1/apps/qgis/./python C:/Users/emna/.qgis2/python C:/Users/emna/.qgis2/python/plugins C:/OSGEO4~1/apps/qgis/./python/plugins C:\OSGEO4~1\apps\Python27\lib\site-packages\setuptools-0.9.8-py2.7.egg C:\OSGEO4~1\bin\python27.zip C:\OSGEO4~1\apps\Python27\DLLs C:\OSGEO4~1\apps\Python27\lib C:\OSGEO4~1\apps\Python27\lib\plat-win C:\OSGEO4~1\apps\Python27\lib\lib-tk C:\OSGEO4~1\bin C:\OSGEO4~1\apps\Python27 C:\OSGEO4~1\apps\Python27\lib\site-packages C:\OSGEO4~1\apps\Python27\lib\site-packages\jinja2-2.7.2-py2.7.egg C:\OSGEO4~1\apps\Python27\lib\site-packages\markupsafe-0.23-py2.7-win-amd64.egg C:\OSGEO4~1\apps\Python27\lib\site-packages\pytz-2012j-py2.7.egg C:/Users/emna/.qgis2//python

Hi,
try this in line 71

self.getButtonByKey(key).sigKeyButtonClicked.connect(lambda: self.addInputByKey(key))

Thank you! I didnt noticed that. I did correct this mistakes, but still getting the same error:( and empty window :/

Hi,

No special suggestions, the goal of both is to provide a complete set of bindings for the Qt modules.

PySide2 information can be found here. If you need to start right now with Qt 5 and python, PyQt might be the current best option.

I haven't tested Python for mobile application so I can't comment on that however there might be catches with the mobile platform development rules about using an interpreter that you should check.

Thanks for this useffull link.

Hi and welcome to devnet,

I'd recommend brining this to the PyQt forum. They'll be best to answer packaging related questions.

Just in case, I saw the pyqt5-tools package that might be interest.

Hope it helps