[PyQt] Re: PyQT lost reference (was: Re: PyKDE: KConfigSkeleton not writing configuration)
Hi, sorry for keeping replying to myself, but nobody else seems to show interest and I am trying to find the root cause of the error: The QString() that I am passing as reference to the C++ class KCoreConfigSkeleton exists as local variable in my Python class derived from KCoreConfigSkeleton. Now any code that interacts with KCoreConfigSkeleton (C++ or Python) may change this QString instance. Looking at the SIP file I see the following: KCoreConfigSkeleton::ItemString* addItemString (const QString name, QString reference, const QString defaultValue = QLatin1String(), const QString key = QString()); Could it be that this method declaration misses /In/ and /Out/ for QString reference? The documentation on /In/ and /Out/ was not too clear for me, could someone elaborate what happens exactly when these statements are given? Thanks, Till ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Re: PyQT lost reference (was: Re: PyKDE: KConfigSkeleton not writing configuration)
On Fri, 13 Mar 2009 11:15:41 +0100, Till Gerken till.ger...@gmail.com wrote: Hi, sorry for keeping replying to myself, but nobody else seems to show interest and I am trying to find the root cause of the error: The QString() that I am passing as reference to the C++ class KCoreConfigSkeleton exists as local variable in my Python class derived from KCoreConfigSkeleton. Now any code that interacts with KCoreConfigSkeleton (C++ or Python) may change this QString instance. Looking at the SIP file I see the following: KCoreConfigSkeleton::ItemString* addItemString (const QString name, QString reference, const QString defaultValue = QLatin1String(), const QString key = QString()); Could it be that this method declaration misses /In/ and /Out/ for QString reference? The documentation on /In/ and /Out/ was not too clear for me, could someone elaborate what happens exactly when these statements are given? By default SIP infers whether an argument is being passed into a function or is only being used to return a value from the function according to the type of the argument. /In/ and /Out/ allow you to be explicit about the direction in case the default behaviour is wrong. For a QString the default is that the argument is being passed into the function. The fact that the string may be being updated doesn't qualify it as being used to return a value in this context. It looks like the omission of any /In/ or /Out/ is correct in this case. Phil ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] Re: PyQT lost reference (was: Re: PyKDE: KConfigSkeleton not writing configuration)
On Freitag, 13. März 2009, Till Gerken wrote: The QString() that I am passing as reference to the C++ class KCoreConfigSkeleton exists as local variable in my Python class derived from KCoreConfigSkeleton. Now any code that interacts with KCoreConfigSkeleton (C++ or Python) may change this QString instance. this is because QString() is mutable while python strings are immutable. When dealing with KCoreConfig, do not use QString as local variables, always convert explicitly from/to python strings. I wonder what happens with this when the QString will be eliminated in PyQt4 as announced. That might break code which relies on QString being mutable. See my message http://www.mail-archive.com:80/pyqt@riverbankcomputing.com/msg16594.html -- Wolfgang ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Re: PyQT lost reference (was: Re: PyKDE: KConfigSkeleton not writing configuration)
On Fri, 13 Mar 2009 11:44:57 +0100, Wolfgang Rohdewald wolfg...@rohdewald.de wrote: On Freitag, 13. März 2009, Till Gerken wrote: The QString() that I am passing as reference to the C++ class KCoreConfigSkeleton exists as local variable in my Python class derived from KCoreConfigSkeleton. Now any code that interacts with KCoreConfigSkeleton (C++ or Python) may change this QString instance. this is because QString() is mutable while python strings are immutable. When dealing with KCoreConfig, do not use QString as local variables, always convert explicitly from/to python strings. No, do exactly the opposite. If you pass a Python string then it will be converted to a QString under the covers. Any changes to that QString will then be discarded. I wonder what happens with this when the QString will be eliminated in PyQt4 as announced. That might break code which relies on QString being mutable. Which is why eliminating QStrings is an incompatible change and will require changes to your code. Phil ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Re: PyQT lost reference (was: Re: PyKDE: KConfigSkeleton not writing configuration)
On Freitag, 13. März 2009, Phil Thompson wrote: Which is why eliminating QStrings is an incompatible change and will require changes to your code. Sorry, it seems I misread your roadmap - I thought this would be a compatible change. -- Wolfgang ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] Executing function with argument under a button in pyqt
hey guys; I have this function that is suppose to extract Exif(exchangeable image formate) from photos and direct the output to an .CSV file (comma seperated values) well the function syntax is like the following: was...@home:~/Desktop/Project2/GUI$ python myexif.py -q waseem1.JPG test.csv in the program now my photos are listed in ListWidget... How can i select photo or multiple photos from the listwidget and execute the above syntax after clicking a button which is already there in order to create a CSV file?? Thanks in advance -- View this message in context: http://www.nabble.com/Executing-function-with-argument-under-a-button-in-pyqt-tp22496319p22496319.html Sent from the PyQt mailing list archive at Nabble.com. ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] Reducing Ram Usage Tips?
Hello, I've recently developed a data analysis program using PyQt. It's not a huge program but it's not small either. I've noticed that, in Windows, the memory usage at startup is ~80MB. I've removed all of the 'import *'s that I previously had and do not load the Qt module at any location. I am packaging the entire library in the exe using py2exe. Just wondering if anyone else has had any success bringing down the memory consumption. Thanks, Darryl ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Executing function with argument under a button in pyqt
Till Gerken-2 wrote: On Fri, Mar 13, 2009 at 2:23 PM, klia alwaseem307s...@yahoo.com wrote: I have this function that is suppose to extract Exif(exchangeable image formate) from photos and direct the output to an .CSV file (comma seperated values) well the function syntax is like the following: was...@home:~/Desktop/Project2/GUI$ python myexif.py -q waseem1.JPG test.csv in the program now my photos are listed in ListWidget... How can i select photo or multiple photos from the listwidget and execute the above syntax after clicking a button which is already there in order to create a CSV file?? Just create a new method that you connect to your button's clicked() signal and include the Exif extraction code there. Since your Exif extraction already seems to be in Python, you do not have to execute any external programs. connect(yourButton, SIGNAL(clicked(bool)), yourExifMethod) The signal is documented here: http://doc.trolltech.com/4.4/qpushbutton.html#details http://doc.trolltech.com/4.4/qabstractbutton.html#clicked Till ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt Thank you for replaying, creating a connect method ain't a problem for me but how to select photo in the ListWidget and then executing myexif functiion with -q argument? -- View this message in context: http://www.nabble.com/Executing-function-with-argument-under-a-button-in-pyqt-tp22496319p22496972.html Sent from the PyQt mailing list archive at Nabble.com. ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] derive from a designer widget
2009/3/13, Andreas Pakulat ap...@gmx.de: I want that it could be as simple as derivating the 'data' class from the 'main window' class. I've read that derivating a widget from another one, makes that widget to appear inside it's parent, right ? No thats wrong. Deriving one class from another is something different than adding a widget to a parent widget. What about this ? #!/bin/env python import sys from PyQt4.QtCore import * from PyQt4.QtGui import * class Frame(QDialog): def __init__(self): QDialog.__init__(self) pass class GUI(Frame): def __init__(self): Frame.__init__(self) b = QLabel(HOLA) l = QVBoxLayout() l.addWidget(b) self.setLayout(l) if __name__ == __main__: app = QApplication(sys.argv) ui = GUI() ui.show() app.exec_() This snippet creates a Frame and a widget as a subclass of it. This is enough to make the widget appear into the Frame I want to achieve that, but with Frame being a compound widget with its central area, and that area being the default 'container' to hold derived widgets. I note that one problem with this using designer, is that designer creates widgets subclassing 'object' instead of 'QWidget' or 'QDialog'. With the main form derived from 'object' i can't make the above subclassing example. Thank you ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Reducing Ram Usage Tips?
Hello Stan stan wrote: On Fri, 2009-03-13 at 09:37 -0400, Darryl Wallace wrote: Hello, I've recently developed a data analysis program using PyQt. It's not a huge program but it's not small either. I've noticed that, in Windows, the memory usage at startup is ~80MB. I've removed all of the 'import *'s that I previously had and do not load the Qt module at any location. I am packaging the entire library in the exe using py2exe. Just wondering if anyone else has had any success bringing down the memory consumption. Thanks, Darryl While there are a great number advantages to having a nice single huge .exe, memory consumption is driven up as that entire .exe has to be loaded in memory at one time, of course. With the one directory option in PyInstaller or py2exe, the .exe's themselves are quite small by comparison, so that loading and speed generally are much faster out of the gate as they make system calls as needed; of course memory usage will then increase as needed, but in general, memory use seems to remain much smaller. Of course, the initial distribution directory is often bigger (a one timer, usually), but later I have found that simple updates, bug fixes, etc. don't require many additional dirctory items (of course this depends on what you later add!), but total subsequent distribution time is greatly simplified and is limited to the new .exe and the simple occasional additions. Ok that's one of the things that I thought regarding the single 'exe' file. Did you happen to avoid using the QTCore4.dll and QtGui4.dll? (you mentioned not having loaded the Qt modules) Can these be avoided in favor of the PyQt dll's?? Those are very large, but I think they must be always and unavoidably pulled in by PyQt?? From what I've read and my experience you cannot avoid including the Qt dll's. While they're very large relatively speaking, my entire program approaches a 21 MB zipped download; acceptable as far as I'm concerned. Darryl ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Executing function with argument under a button in pyqt
On Fri, Mar 13, 2009 at 2:59 PM, klia alwaseem307s...@yahoo.com wrote: Till Gerken-2 wrote: On Fri, Mar 13, 2009 at 2:23 PM, klia alwaseem307s...@yahoo.com wrote: I have this function that is suppose to extract Exif(exchangeable image formate) from photos and direct the output to an .CSV file (comma seperated values) well the function syntax is like the following: was...@home:~/Desktop/Project2/GUI$ python myexif.py -q waseem1.JPG test.csv in the program now my photos are listed in ListWidget... How can i select photo or multiple photos from the listwidget and execute the above syntax after clicking a button which is already there in order to create a CSV file?? Just create a new method that you connect to your button's clicked() signal and include the Exif extraction code there. Since your Exif extraction already seems to be in Python, you do not have to execute any external programs. connect(yourButton, SIGNAL(clicked(bool)), yourExifMethod) The signal is documented here: http://doc.trolltech.com/4.4/qpushbutton.html#details http://doc.trolltech.com/4.4/qabstractbutton.html#clicked creating a connect method ain't a problem for me but how to select photo in the ListWidget and then executing myexif functiion with -q argument? For selecting an item in the list widget and retrieving an item see QListWidget::setCurrentItem() and QListWidget::currentItem(): http://doc.trolltech.com/4.4/qlistwidget.html#currentItem http://doc.trolltech.com/4.4/qlistwidget.html#setCurrentItem If the list item is changed, currentItemChanged() is emitted: http://doc.trolltech.com/4.4/qlistwidget.html#currentItemChanged And for executing, why do you want to run a Python script as external application rather than just embedding it into your own script? But if you really want to run it as external application, see os.exec*(): http://docs.python.org/library/os.html#process-management Till ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Reducing Ram Usage Tips?
OK, Darryl, thanks for that time saving response! I was pretty sure that was the case. Hope the other solution helps you some... will post again if I find anything relevant as I continue on...! On Fri, 2009-03-13 at 10:44 -0400, Darryl Wallace wrote: Hello Stan stan wrote: On Fri, 2009-03-13 at 09:37 -0400, Darryl Wallace wrote: Hello, I've recently developed a data analysis program using PyQt. It's not a huge program but it's not small either. I've noticed that, in Windows, the memory usage at startup is ~80MB. I've removed all of the 'import *'s that I previously had and do not load the Qt module at any location. I am packaging the entire library in the exe using py2exe. Just wondering if anyone else has had any success bringing down the memory consumption. Thanks, Darryl While there are a great number advantages to having a nice single huge .exe, memory consumption is driven up as that entire .exe has to be loaded in memory at one time, of course. With the one directory option in PyInstaller or py2exe, the .exe's themselves are quite small by comparison, so that loading and speed generally are much faster out of the gate as they make system calls as needed; of course memory usage will then increase as needed, but in general, memory use seems to remain much smaller. Of course, the initial distribution directory is often bigger (a one timer, usually), but later I have found that simple updates, bug fixes, etc. don't require many additional dirctory items (of course this depends on what you later add!), but total subsequent distribution time is greatly simplified and is limited to the new .exe and the simple occasional additions. Ok that's one of the things that I thought regarding the single 'exe' file. Did you happen to avoid using the QTCore4.dll and QtGui4.dll? (you mentioned not having loaded the Qt modules) Can these be avoided in favor of the PyQt dll's?? Those are very large, but I think they must be always and unavoidably pulled in by PyQt?? From what I've read and my experience you cannot avoid including the Qt dll's. While they're very large relatively speaking, my entire program approaches a 21 MB zipped download; acceptable as far as I'm concerned. Darryl ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] derive from a designer widget
On 13.03.09 12:18:24, Mario Daniel Carugno wrote: 2009/3/13, Andreas Pakulat ap...@gmx.de: I want that it could be as simple as derivating the 'data' class from the 'main window' class. I've read that derivating a widget from another one, makes that widget to appear inside it's parent, right ? No thats wrong. Deriving one class from another is something different than adding a widget to a parent widget. What about this ? #!/bin/env python import sys from PyQt4.QtCore import * from PyQt4.QtGui import * class Frame(QDialog): def __init__(self): QDialog.__init__(self) pass class GUI(Frame): def __init__(self): Frame.__init__(self) b = QLabel(HOLA) l = QVBoxLayout() l.addWidget(b) self.setLayout(l) if __name__ == __main__: app = QApplication(sys.argv) ui = GUI() ui.show() app.exec_() This snippet creates a Frame and a widget as a subclass of it. No its not, you're mixing different terms here. A subclass (aka derived class) in python is created by this statement: class Foo(Bar): ... In this case Foo is a subclass of Bar. However in the above example (with the magic re-parenting of QLayoutQWidget) b is just a child widget inside your Frame. This is enough to make the widget appear into the Frame I want to achieve that, but with Frame being a compound widget with its central area, and that area being the default 'container' to hold derived widgets. Then you should do similar to what QMainWindow does, provide a setCentralWidget() method which takes a complete widget and uses for the central area of the window. I note that one problem with this using designer, is that designer creates widgets subclassing 'object' instead of 'QWidget' or 'QDialog'. With the main form derived from 'object' i can't make the above subclassing example. Thats because Qt designer doesn't design any widgets. You design a template of how your gui should look like and then you can apply that template to a given QWidget. That will create the designed gui inside the given QWidget. Afterwards you can add that QWidget into any layout and the GUI will show up inside that layout. Maybe you should have a closer look at the PyQt examples and maybe check out Mark Summerfields book on PyQt. It seems your missing some of the basics of Qt GUI's. Andreas -- You will pioneer the first Martian colony. ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Re: PyQT lost reference (was: Re: PyKDE: KConfigSkeleton not writing configuration)
On 3/13/09, Phil Thompson p...@riverbankcomputing.com wrote: On Fri, 13 Mar 2009 11:44:57 +0100, Wolfgang Rohdewald wolfg...@rohdewald.de wrote: On Freitag, 13. März 2009, Till Gerken wrote: The QString() that I am passing as reference to the C++ class KCoreConfigSkeleton exists as local variable in my Python class derived from KCoreConfigSkeleton. Now any code that interacts with KCoreConfigSkeleton (C++ or Python) may change this QString instance. this is because QString() is mutable while python strings are immutable. When dealing with KCoreConfig, do not use QString as local variables, always convert explicitly from/to python strings. No, do exactly the opposite. If you pass a Python string then it will be converted to a QString under the covers. Any changes to that QString will then be discarded. The weird thing in this case is that the changes made by KCoreConfigSkeleton are discarded. Even if I call KCoreConfigSkeleton::ItemString::setValue(), the referenced QString is not updated (although it will then be written to disk correctly). This suggests that two instances of the same QString exist. I can live with the workaround calling KCoreConfigSkeleton::ItemString::setValue() and getValue(), but I wonder where the bug is. Any pointers would be appreciated. Till ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] QDataStream and arbitrary Python objects
I'm a bit of a PyQt newbie but have plenty of Python experience. Does anyone know if arbitrary Python objects will be supported by QDataStream in PyQt 4.5? I'm looking for a method of using PyQts model/view programming and its drag and drop functionality with Python's base object class which doesn't seem to be supported. Surprisingly, it seems that QDataStream doesn't even support QObject (unless I'm missing something) Many thanks! -Scott ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Executing function with argument under a button in pyqt
I came across this link while I was
trying to do the same thing. It explained everything and might help you
with passing arguments.
http://blog.qgis.org/node/102
Cheers,
-Scott
klia wrote:
Till Gerken-2 wrote:
On Fri, Mar 13, 2009 at 2:23 PM, klia alwaseem307s...@yahoo.com wrote:
I have this function that is suppose to extract Exif(exchangeable image
formate) from photos and direct the output to an .CSV file (comma
seperated
values)
well the function syntax is like the following:
was...@home:~/Desktop/Project2/GUI$ python myexif.py -q waseem1.JPG
test.csv
in the program now my photos are listed in ListWidget...
How can i select photo or multiple photos from the listwidget and execute
the above syntax after clicking a button which is already there in order
to
create a CSV file??
Just create a new method that you connect to your button's clicked()
signal and include the Exif extraction code there. Since your Exif
extraction already seems to be in Python, you do not have to execute
any external programs.
connect(yourButton, SIGNAL("clicked(bool)"), yourExifMethod)
The signal is documented here:
http://doc.trolltech.com/4.4/qpushbutton.html#details
http://doc.trolltech.com/4.4/qabstractbutton.html#clicked
Till
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Thank you for replaying,
creating a connect method ain't a problem for me but how to select photo in
the ListWidget and then executing myexif functiion with -q argument?
___
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