I've used PyQt4 in maya quite a bit, and generally I've found it quite easy to switch to PySide, but I'm having trouble getting the pointer to the main window. Perhaps someone can understand what's going wrong.
Here's what I do in PyQt4:
import sip, PyQt4.QtCore
import maya.OpenMayaUI as mui
ptr = mui.MQtUtil.mainWindow()
parent = sip.wrapinstance(long(ptr), PyQt4.QtCore.QObject)
This works fine. When I try the same in PySide:
import sip, PySide.QtCore
import maya.OpenMayaUI as mui
ptr = mui.MQtUtil.mainWindow()
parent = sip.wrapinstance(long(ptr), PySide.QtCore.QObject)
I get the following error:
# Error: wrapinstance() argument 2 must be sip.wrappertype, not Shiboken.ObjectType
# Traceback (most recent call last):
# File "<maya console>", line 4, in <module>
# TypeError: wrapinstance() argument 2 must be sip.wrappertype, not Shiboken.ObjectType #
Anyone know what's going wrong?
You need to import shiboken instead of sip and pass QWidget to wrapInstance instead of QObject
Edit: Maya2017 contains shiboken2 and PySide2 instead of shiboken and PySide as pointed out in comments below.
import shiboken
from PySide import QtGui, QtCore
import maya.OpenMayaUI as apiUI
def getMayaWindow():
"""
Get the main Maya window as a QtGui.QMainWindow instance
#return: QtGui.QMainWindow instance of the top level Maya windows
"""
ptr = apiUI.MQtUtil.mainWindow()
if ptr is not None:
return shiboken.wrapInstance(long(ptr), QtGui.QWidget)
Please note that sip has wrapinstance in which i is not capital but in shiboken.wrapInstance i is capital.
shiboken.wrapInstance() requires wrapertype as a second argument, so you can pass QWidget as a second argument.
Because the previous answer has become somewhat out-of-date, here is a more current version to save someone the trouble of having to update it themselves.
Two approaches for getting the maya main window:
using PySide2:
from PySide2 import QtWidgets
global app
app = QtWidgets.QApplication.instance() #get the qApp instance if it exists.
if not app:
app = QtWidgets.QApplication(sys.argv)
def getMayaMainWindow():
mayaWin = next(w for w in app.topLevelWidgets() if w.objectName()=='MayaWindow')
return mayaWin
print(getMayaMainWindow())
Using shiboken2 and the maya api:
import maya.OpenMayaUI as apiUI
from PySide2 import QtWidgets
try:
import shiboken2
except:
from PySide2 import shiboken2
def getMayaMainWindow():
ptr = apiUI.MQtUtil.mainWindow()
mayaWin = shiboken2.wrapInstance(long(ptr), QtWidgets.QWidget)
return mayaWin
print(getMayaMainWindow())
depending on your needs, the following more modern code might be easier too use.
since maya now has a build in method to access the main window in qt
import pymel.core as pm
mayaWindow = pm.ui.Window("MayaWindow").asQtObject()
your_widget.setParent(mayaWindow)
Related
I get the following error if I create a QWebEngineView instance from Python instances in different working directories:
[2452:9872:1108/052617.050:ERROR:cache_util_win.cc(21)] Unable to move the cache: Access is denied. (0x5)
[2452:9872:1108/052617.050:ERROR:cache_util.cc(135)] Unable to move cache folder C:\Users\Adam\AppData\Local\python\QtWebEngine\Default\GPUCache to C:\Users\Adam\AppData\Local\python\QtWebEngine\Default\old_GPUCache_000
[2452:9872:1108/052617.051:ERROR:disk_cache.cc(184)] Unable to create cache
[2452:9872:1108/052617.056:ERROR:shader_disk_cache.cc(606)] Shader Cache Creation failed: -2
from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets
from PyQt5.QtCore import Qt
app = QtWidgets.QApplication([])
x = QtWebEngineWidgets.QWebEngineView()
x.load(QtCore.QUrl('http://example.com/'))
It seems this is a known issue and will be fixed in QT6: https://bugreports.qt.io/browse/QTBUG-66014
But in the meantime, how can I suppress this message? I tried changing QtCore.qInstallMessageHandler and also x.page().javaScriptConsoleMessage = lambda self, level, msg, line, sourceID: None, neither affected this message.
One possible solution is to raise the level of the chromium log:
import os
from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets
os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--enable-logging --log-level=3"
app = QtWidgets.QApplication([])
x = QtWebEngineWidgets.QWebEngineView()
# ...
I'm learning pyqt5, and specifically how to use it with the QT Designer. I'm sort of following the turorial HERE. However in this tutorial they are converting the XML interface to Python code with pyuic5, while I'm trying to import it dynamically with uic.loadUi("myui.ui"). In the tutorial we define a slot with the signals and slot editor named " browseSlot".
When I try to run/compile, at the line
dlg = uic.loadUi("myui.ui")
I get the error:
AttributeError: 'QMainWindow' object has no attribute 'browseSlot'
I think what's going on is that QT Designer connects a signal to the slot 'browseSlot' but because a 'browseSlot' method isn't defined in the myui.ui, the error is thrown, because there is no way for the interpreter to know I'm referring to a method that is outside the UI interface file. (In this case, in the module that loads the interface). As far as I can tell QT Designer only lets me connect signals to slots, not define a whole new one. I think that way this is handled in other frameworks is that there will be an abstract method that needs over riding. So what can I do in this situation to make it work?
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtCore import QObject, pyqtSlot
import sys
app = QtWidgets.QApplication([])
dlg = uic.loadUi("myui.ui")
#pyqtSlot
def returnPressedSlot():
pass
#pyqtSlot
def writeDocSlot():
pass
#pyQt
def browseSlot():
pass
dlg.show()
sys.exit(app.exec())
The slots belong to the class that is used returns loadUi(), they are not any functions since they do not magically not connect them, if you want to use loadUi() and implement these methods you must inherit from the class corresponding to the template that you used, in the example of the link Main Window was used so it must be inherited from QMainWindow:
from PyQt5 import QtCore, QtGui, QtWidgets, uic
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
uic.loadUi("mainwindow.ui", self)
#QtCore.pyqtSlot()
def returnPressedSlot():
pass
#QtCore.pyqtSlot()
def writeDocSlot():
pass
#QtCore.pyqtSlot()
def browseSlot():
pass
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
try this out
from PyQt5 import QtWidgets, uic
app = QtWidgets.QApplication([])
form = uic.loadUi("login.ui")
form2.show()
app.exec()
the above python code should display your gui app properly as long as you have install PyQt5 and PyQt5-tools,if you haven't then open CMD and typeenter code here "pip install PyQt5" and click enter.once installation is done type "pip install PyQt5-tools" then you are good to go
Im trying to make function, which passes 8 values to the progress bars in window app made with QtDesigner.
That is there is a function which actually generates this values. I want to execute it every second in order to get theese values and update progress bars which displays values.
I combined tutorials about making a graphic app with Python and making an app with dynamically updating progess bars:
Python Qt Development: https://www.youtube.com/watch?v=eD91nE8q8Nk
PyQt Progress bar with Thread: https://www.youtube.com/watch?v=ivcxZSHL7jM
The problem is that values are passed correctly, but when it comes to send the signal, the whole app crashes with message:
Process finished with exit code 139 (interrupted by signal 11:
SIGSEGV)
Here is my code:
Module which generates the values (probkowanie.py):
import time
from random import randint
import threading
def getSignals():
time.sleep(1)
signals = (randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), randint(0, 100), )
return signals
and here is main program code:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from PySide.QtCore import *
from PySide.QtGui import *
from PyQt4 import QtCore
import sys
import time
import signalPreview # window library
import probkowanie # values generating library
class MainDialog(QDialog, signalPreview.Ui_mainDialog):
def __init__(self, parent=None):
super(MainDialog, self).__init__(parent)
self.setupUi(self)
self.threadclass = ThreadClass()
self.threadclass.start()
self.connect(self.threadclass, QtCore.SIGNAL('MYO_SIGNALS'), self.updateProgressBars)
def updateProgressBars(self, signals):
self.progressBar.setValue(signals[0])
class ThreadClass(QtCore.QThread):
def __init__(self, parent = None):
super(ThreadClass, self).__init__(parent)
def run(self):
while 1:
signals = probkowanie.getSignals()
self.emit(QtCore.SIGNAL('MYO_SIGNALS'), 5) # this line causes crash
print signals # it works correctly
app = QApplication(sys.argv)
form = MainDialog()
form.show()
app.exec_()
I think it may be caused by mixing libraries. I use QtCore from PySide even though tutorial number 2 is based on PyQt4. My decision is because tutorial number 1 is based on PySide.
I tried changing:
from PySide import QtCore
to
from PyQt4 import QtCore
but then I get another bunch of errors, which I don't know what to do with:
Traceback (most recent call last):
File "/usr/lib/pycharm/helpers/pydev/pydevd.py", line 1580, in <module>
globals = debugger.run(setup['file'], None, None, is_module)
File "/usr/lib/pycharm/helpers/pydev/pydevd.py", line 964, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "/mnt/Grubas/Projekty/Biomed/MYO/myo.py", line 36, in <module>
form = MainDialog()
File "/mnt/Grubas/Projekty/Biomed/MYO/myo.py", line 20, in __init__
self.connect(self.threadclass, QtCore.SIGNAL('MYO_SIGNALS'), self.updateProgressBars)
TypeError: 'PySide.QtCore.QObject.connect' called with wrong argument types:
PySide.QtCore.QObject.connect(ThreadClass, str, instancemethod)
Supported signatures:
PySide.QtCore.QObject.connect(PySide.QtCore.QObject, str, callable, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
PySide.QtCore.QObject.connect(PySide.QtCore.QObject, PySide.QtCore.QMetaMethod, PySide.QtCore.QObject, PySide.QtCore.QMetaMethod, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
PySide.QtCore.QObject.connect(PySide.QtCore.QObject, str, PySide.QtCore.QObject, str, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
PySide.QtCore.QObject.connect(PySide.QtCore.QObject, str, str, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection) PySide.QtCore.QObject.connect(str, callable, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
PySide.QtCore.QObject.connect(str, PySide.QtCore.QObject, str, PySide.QtCore.Qt.ConnectionType = Qt.AutoConnection)
#EDIT
After providing changes proposed by #ekhumoro script doens't crash, but now I'm getting another error:
QObject::connect: Cannot queue arguments of type 'object' (Make sure
'object' is registered using qRegisterMetaType().)
I tried to look for solution on my own, but I didn't find the exact code which I need. I also tried transforming type of signal from (object) to (tuple) or (list), but it leads to another errors:
TypeError: Unknown type used to call meta function (that may be a
signal): tuple
The most solutions I found are based on PyQT. Is there an easy way to rewrite it for PySide?
Here is an example of solution, which seems to be correct but is made using PyQT:
https://stackoverflow.com/a/2595607/2550466
You are right to think that mixing PySide and PyQt will cause problems, so you will need to remove one of them. However, the crash itself is probably caused by a bug in PySide. There is an SO question with a similar problem shown here:
How to send None with Signals across threads?
So you also need to change the way you define and emit MYO_SIGNALS.
Below is a fixed version of your script (the changed lines are commented):
# from PySide.QtCore import *
# from PySide.QtGui import *
# from PyQt4 import QtCore
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
import time
import signalPreview # window library
import probkowanie # values generating library
class MainDialog(QDialog):
def __init__(self, parent=None):
super(MainDialog, self).__init__(parent)
self.setupUi(self)
self.threadclass = ThreadClass()
self.threadclass.start()
# self.connect(self.threadclass, QtCore.SIGNAL('MYO_SIGNALS'), self.updateProgressBars)
self.connect(self.threadclass, SIGNAL('MYO_SIGNALS'), self.updateProgressBars)
def updateProgressBars(self, signals):
self.progressBar.setValue(signals[0])
# class ThreadClass(QtCore.QThread):
class ThreadClass(QThread):
def __init__(self, parent = None):
super(ThreadClass, self).__init__(parent)
def run(self):
while 1:
signals = probkowanie.getSignals()
# self.emit(QtCore.SIGNAL('MYO_SIGNALS'), 5) # this line causes crash
self.emit(SIGNAL('MYO_SIGNALS'), signals)
print signals # it works correctly
app = QApplication(sys.argv)
form = MainDialog()
form.show()
app.exec_()
I am trying to create UI using PyQt4 on centos. But When ever I am trying to load QtGui.QMainWindow I am getting the error:
Traceback(most recent call last):
File "test.py", line 7, in <module>
Ui_MainWindow, QtBaseClass = uic.loadUiType(ui_file_path)
File "/usr/local/lib/python2.7/site-packages/PyQt4/uic/__init__.py", line 160, inloadUiType
return (ui_globals[winfo["uiclass"]],getattr(Qtgui, winfo["baseclass"]))
AttributeError:'module' object has no attribute 'qmainwindow'
This My Code,I am using python 2.7.9:
import sys
import os
from PyQt4 import QtCore, QtGui, uic
ui_file_path = os.getcwd()+"/test.ui" # Enter file here.
Ui_MainWindow, QtBaseClass = uic.loadUiType(ui_file_path)
class MyApp(QtGui.QMainWindow, Ui_MainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
Ui_MainWindow.__init__(self)
self.setupUi(self)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
window = MyApp()
window.show()
sys.exit(app.exec_())
Thanks in advance.
I was having the same issue on Ubuntu 16.04, using PyQt5, and python3. This could apply to PyQt4 as well, so why not give it a shot?
I found from https://doc.bccnsoft.com/docs/PyQt5/pyqt4_differences.html# the solution to be changing QtGui.QMainWindow to QtWidget.QMainWindow as they have changed. This also needed to be applied to QApplication as well, and the import of QtGui was not needed in the code (replaced with import ..., QtWidget).
I wish you luck in solving this issue.
Forgive me if I miss the point, but I don't understand why MyApp inherits from both QtGui.QMainWindow and Ui_MainWindow.
Would something like this work for you?
import sys
import os
from PyQt4 import QtGui, uic
ui_file_path = os.path.join(os.getcwd(), "test.ui") # Enter file here.
class MyApp(QtGui.QMainWindow):
def __init__(self):
# Parent class init
QtGui.QMainWindow.__init__(self)
# You may also write
# super(MyApp, self).__init__()
# Load UI
uic.loadUi(ui_file_path, self)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
window = MyApp()
window.show()
sys.exit(app.exec_())
Edit
There seems to be a case issue, here.
In my Python interpreter, I get this:
import os
os.PAth
# This prints: AttributeError: 'module' object has no attribute 'PAth'
os.path
# This works
In your case, you enter the correct case, but get an error with the attribute in an incorrect case in the error message:
class Myapp(QtGui.QMainWindow)
# AttributeError:'module' object has no attribute 'qmainwindow'
As if somewhere between the text editor and the interpreter, something had lowered the case of QMainWindow. I don't have any hypothesis regarding why this would happen, but it could be nested somewhere not obvious.
Can you reproduce in an interpreter? More explicitly, can you run a Python interpreter on the same machine and try this:
import PyQt4.QtGui
PyQt4.QtGui.QMainWindow
import os
os.PAth
and see what errors you get?
(Note: in your comment below, there's a case error in QtGui.QMainWindow (you wrote QtGui.QMainWIndow). I suppose you made it while writing the comment, not in the code.)
I'm using Python 2.7 with PySide and want to use this to retrieve pen pressure from my wacom pen.
So I tried setting up the following
import PySide
from PySide import QtCore, QtGui
pressure = PySide.QtGui.QTabletEvent.pressure()
print pressure
That threw the following error
pressure = PySide.QtGui.QTabletEvent.pressure()
TypeError: descriptor 'pressure' of 'PySide.QtGui.QTabletEvent' object needs an argument
The object it needs is a "PySide.QtGui.QTabletEvent" Object. But I have no idea how can I retrieve such an object.
So my question is, how do I retrieve the wacom penpressure using QTabletEvent?
You need to receive the actual event and obtain the pressure from it.
Example:
import sys
from PySide import QtCore, QtGui
class MyWidget(QtGui.QWidget):
def tabletEvent(self, e):
print(e.pressure())
app = QtGui.QApplication(sys.argv)
widget = MyWidget()
widget.show()
app.exec_()