[Interest] Myanmar-QWERTY crashes OS X application

Timothy W. Grove tim_grove at sil.org
Thu Aug 25 11:45:23 CEST 2016 

On 23/08/2016 09:18, Viktor Engelmann wrote:
>
> I wouldn't suggest using virtual machines as reference, because you 
> never know what problems might be solved (or caused) by the VM in the 
> background...
>
Agreed, its just after destroying a partition while attempting to 
upgrade Mavericks to El Capitan, running El Capitan in a VM is my only 
option at the moment. But that is another story....

Running my full PyQt app in El Capitan works better up to a point, in 
that switching 'British' to 'Myanmar-QWERTY' via system preferences 
doesn't crash it. But my application includes code to switch the 
keyboard input source depending on which text editor is in focus, and 
that is still causing problems. I'm attempting to expand my test Qt app 
to include a couple of QTextEdits and switching code to see how that 
works...

Tim
>
>
>
> On 22.08.2016 21:30, Timothy W. Grove wrote:
>>
>> I don't think you are doing anything wrong; perhaps even doing 
>> something right! My development and testing has been on Mavericks 
>> where I am seeing the problems, but when I try the same things on El 
>> Capitan (in a Parallels Virtual Machine) there don't seem to be any 
>> issues. More testing is needed and I'll see if I have the same 
>> 'success' with my full PyQt application on El Capitan. Thanks for the 
>> reply.
>>
>> Best regards, Tim
>>
>>
>> On 22/08/2016 09:14, Alexandru Croitor wrote:
>>> Hi,
>>>
>>> I tried reproducing your issue, and wasn't successful, no crash happens.
>>> I have OSX 10.11.5, Official Qt 5.7.0, only two languages installed, 
>>> British and Myanmar-QWERTY, and I'm using the auto-generated 
>>> Qt-Creator QMainWindow example.
>>>
>>> After launching the application, I try to switch the languages 
>>> around with hotkey, with clicking in the top-right language corner, 
>>> and by changing the language directly in System Preferences -> 
>>> Keyboard -> Input Sources.
>>>
>>> No crash is happening. What am I doing wrong?
>>>
>>> Regards, Alex.
>>>
>>>> On 19 Aug 2016, at 20:13, Timothy W. Grove <tim_grove at sil.org 
>>>> <mailto:tim_grove at sil.org>> wrote:
>>>>
>>>> Well, my first experiences working with QtCreator directly and I'm 
>>>> seeing the same issues. I guess that points to bugs in Qt itself 
>>>> and lets Phil Thompson at riverbankcomputing off of the hook! If 
>>>> not here, where should I report the problem? Sample program below 
>>>> followed by some error reports. The errors occur when switching 
>>>> back and forth between 'British' and 'Myanmar-QWERTY' in system 
>>>> preferences in OS X.
>>>>
>>>> Best regards,
>>>> Timothy Grove
>>>>
>>>>
>>>> *Test program:*
>>>>
>>>> #include "mainwindow.h"
>>>> #include "ui_mainwindow.h"
>>>>
>>>> MainWindow::MainWindow(QWidget *parent) :
>>>>      QMainWindow(parent),
>>>>      ui(new Ui::MainWindow)
>>>> {
>>>>      ui->setupUi(this);
>>>> }
>>>>
>>>> MainWindow::~MainWindow()
>>>> {
>>>>      delete ui;
>>>> }
>>>>
>>>>
>>>>
>>>> *Errors reported in QtCreator console:*
>>>>
>>>> Starting /Users/timothy/QtProjects/build-SooSL-Desktop_Qt_5_7_0_clang_64bit-Debug/SooSL.app/Contents/MacOS/SooSL...
>>>> 2016-08-19 18:42:39.108 SooSL[1354:507] -[NSHIObject length]: unrecognized selector sent to instance 0x7fe153d1d560
>>>> 2016-08-19 18:42:39.108 SooSL[1354:507] -[NSHIObject length]: unrecognized selector sent to instance 0x7fe153d1d560
>>>> 2016-08-19 18:42:39.110 SooSL[1354:507] (
>>>> 	0   CoreFoundation                      0x00007fff879d225c __exceptionPreprocess + 172
>>>> 	1   libobjc.A.dylib                     0x00007fff8d27de75 objc_exception_throw + 43
>>>> 	2   CoreFoundation                      0x00007fff879d512d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
>>>> 	3   CoreFoundation                      0x00007fff87930272 ___forwarding___ + 1010
>>>> 	4   CoreFoundation                      0x00007fff8792fdf8 _CF_forwarding_prep_0 + 120
>>>> 	5   QtCore                              0x000000010a2bb876 _ZN9QCFString9toQStringEPK10__CFString + 54
>>>> 	6   libqcocoa.dylib                     0x000000010c741ac7 _ZN18QCocoaInputContext12updateLocaleEv + 87
>>>> 	7   CoreFoundation                      0x00007fff879a0e0c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
>>>> 	8   CoreFoundation                      0x00007fff8789482d _CFXNotificationPost + 2893
>>>> 	9   Foundation                          0x00007fff89f62e4a -[NSNotificationCenter postNotificationName:object:userInfo:] + 68
>>>> 	10  CoreFoundation                      0x00007fff879a0e0c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
>>>> 	11  CoreFoundation                      0x00007fff87962f79 ____CFXNotificationPostToken_block_invoke + 137
>>>> 	12  CoreFoundation                      0x00007fff8790348c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
>>>> 	13  CoreFoundation                      0x00007fff878f4ae5 __CFRunLoopDoBlocks + 341
>>>> 	14  CoreFoundation                      0x00007fff878f486e __CFRunLoopRun + 1982
>>>> 	15  CoreFoundation                      0x00007fff878f3e75 CFRunLoopRunSpecific + 309
>>>> 	16  HIToolbox                           0x00007fff8aff3a0d RunCurrentEventLoopInMode + 226
>>>> 	17  HIToolbox                           0x00007fff8aff37b7 ReceiveNextEventCommon + 479
>>>> 	18  HIToolbox                           0x00007fff8aff35bc _BlockUntilNextEventMatchingListInModeWithFilter + 65
>>>> 	19  AppKit                              0x00007fff9189d24e _DPSNextEvent + 1434
>>>> 	20  AppKit                              0x00007fff9189c89b -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
>>>> 	21  AppKit                              0x00007fff9189099c -[NSApplication run] + 553
>>>> 	22  libqcocoa.dylib                     0x000000010c71c53f _ZN21QCocoaEventDispatcher13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 2191
>>>> 	23  QtCore                              0x000000010a266eb1 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 401
>>>> 	24  QtCore                              0x000000010a26b115 _ZN16QCoreApplication4execEv + 341
>>>> 	25  SooSL                               0x00000001093eb12b main + 91
>>>> 	26  libdyld.dylib                       0x00007fff8ea2c5fd start + 1
>>>> )
>>>> On 19/08/2016 16:48, timur.kristof at gmail.com wrote:
>>>>> Can you create a simple example app without Python, to see if it really is Qt's fault?
>>>>>
>>>>> (Just create an app with Qt Creator and run it. As far as I understand, you use QWidgets, right? If so, create an empty QWitgets project, run and see how it goes.)
>>>>>
>>>>> On Fri Aug 19 13:33:58 2016 GMT+0200, Timothy W. Grove wrote:
>>>>>> Changing the keyboard input source on OS X back and forth between
>>>>>> 'British' and 'Myanmar-QWERTY' crashes my PyQt v5.7 application after
>>>>>> about three changes, usually corrupting an attached sqlite database as
>>>>>> well. 'Myanmar-QWERTY' is the only input source that I'm having trouble
>>>>>> with; all others that I've tested so far appear okay. The windows
>>>>>> version of the application also seems okay. My application is fairly
>>>>>> complex, but I'm seeing this issue even with an absolute minimal app
>>>>>> containing only one window. I'm not certain if the issue is with PyQt or
>>>>>> Qt or the input source itself, but it doesn't appear to be with python
>>>>>> as a Tkinter app worked okay.
>>>>>>
>>>>>> Any answers would be great, but if anyone could suggest where to find a
>>>>>> solution that would also be helpful. This is a pretty obscure bug, but
>>>>>> finding a solution or work-around is important to the application I'm
>>>>>> developing. Thank you.
>>>>>>
>>>>>> Best regards,
>>>>>> Timothy Grove
>>>>>>
>>>>>>
>>>>>> Test program:
>>>>>>
>>>>>> #!/usr/bin/env python3
>>>>>> # -*- coding: utf-8 -*-
>>>>>>
>>>>>> import sys
>>>>>> from PyQt5.QtWidgets import QMainWindow
>>>>>> from PyQt5.QtWidgets import QTextEdit
>>>>>> from PyQt5.QtWidgets import QApplication
>>>>>>
>>>>>> class MainWindow(QMainWindow):
>>>>>>       def __init__(self, parent=None):
>>>>>>           super(MainWindow, self).__init__(parent)
>>>>>>
>>>>>>           text = QTextEdit()
>>>>>>           self.setCentralWidget(text)
>>>>>>
>>>>>> if __name__ == "__main__":
>>>>>>       app = QApplication(sys.argv)
>>>>>>
>>>>>>       mw = MainWindow()
>>>>>>       mw.show()
>>>>>>
>>>>>>       sys.exit(app.exec_())
>>>>>>
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>>>>>>
>>>>
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>>
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