David,
Thank you so much. Your suggestion got me thinking the right way and now the program is working just as I want it to. To prove how much of a noob I am, I should tell you, now that it is working I could sit and watch the screen toggle between queries for hours! HA. Feels like a major achievement. Of course, I realize its not really at all, but boy it sure feels cool.
Thanks,
Brian
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Sent: Friday, July 12, 2013 5:00:01 AM
Subject: PyQt Digest, Vol 108, Issue 13
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Today's Topics:
1. Re: help a noob, Im a noob (David Boddie)
2. Parent child relationship: child survives parent (Volker Pilipp)
3. Re: Parent child relationship: child survives parent
(Phil Thompson)
----------------------------------------------------------------------
Message: 1
Date: Thu, 11 Jul 2013 20:00:50 +0200
From: David Boddie <david at boddie.org.uk>
To: pyqt at riverbankcomputing.com
Subject: Re: [PyQt] help a noob, Im a noob
Message-ID: <201307112000.51212.david at boddie.org.uk>
Content-Type: Text/Plain; charset="iso-8859-1"
On Tue, 9 Jul 2013 15:00:25 -0600 (MDT), Brian McDonald wrote:
> Just getting into programming in general. Loving python so far. I am
> working on an application that will display database information on
> screen. The idea is that some rows of database information will appear on
> screen for 30 seconds, and then the next rows will appear. I think I have
> made some pretty good headway getting the database connected and even
> displaying data, but I am having a hell of a time getting the data to
> refresh to a new query after 30 seconds. I feel like I must just be
> calling the qtimer at the wrong point in the program. Or, perhaps I should
> be using a "while" loop of some kind. Anyway, here is my code. Any help
> would be sooo appreciated.
Just quickly glancing at the code, I notice that you start the timer after
the application has run. Have you tried starting the timer in your run()
method?
David
------------------------------
Message: 2
Date: Fri, 12 Jul 2013 09:30:46 +0200
From: Volker Pilipp <volker.pilipp at dectris.com>
To: pyqt at riverbankcomputing.com
Subject: [PyQt] Parent child relationship: child survives parent
Message-ID:
<CAHio_yWovSQyiq1x1TMeWOGoG4pjM6179yCDELKgS0bXrj7_rQ at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I've got a little bit confused about ownership of objects in SIP As
far as I understand, if ParentObject owns ChildObject, the destruction
of ChildObject is left to c++ i.e. the c++ destructor of ParentObject
is expected to destruct ChildObject. This behaviour may result in a
seg fault if the python programmer does not make sure that ChildObject
goes out of scope before ParentObject does. Indeed, there are many
scenarios where this may happen accidentally.
That's what I would like to have: The ChildObject keeps a reference
on ParentObject that is released during destruction of ChildObject,
where the Python destructor of ChildObject must not call the c++
destructor of the wrapped c++ instance (this is done during
destruction of ParentObject).
I am wondering if this behavior is possible to achieve in SIP.
------------------------------
Message: 3
Date: Fri, 12 Jul 2013 08:44:43 +0100
From: Phil Thompson <phil at riverbankcomputing.com>
To: Volker Pilipp <volker.pilipp at dectris.com>
Cc: pyqt at riverbankcomputing.com
Subject: Re: [PyQt] Parent child relationship: child survives parent
Message-ID: <84fc10803f95f9bd598555abed8b40f7 at localhost>
Content-Type: text/plain; charset=UTF-8
On Fri, 12 Jul 2013 09:30:46 +0200, Volker Pilipp
<volker.pilipp at dectris.com> wrote:
> I've got a little bit confused about ownership of objects in SIP As
> far as I understand, if ParentObject owns ChildObject, the destruction
> of ChildObject is left to c++ i.e. the c++ destructor of ParentObject
> is expected to destruct ChildObject. This behaviour may result in a
> seg fault if the python programmer does not make sure that ChildObject
> goes out of scope before ParentObject does. Indeed, there are many
> scenarios where this may happen accidentally.
If you are talking about QObject then you shouldn't get a segfault - you
should get a Python exception.
> That's what I would like to have: The ChildObject keeps a reference
> on ParentObject that is released during destruction of ChildObject,
> where the Python destructor of ChildObject must not call the c++
> destructor of the wrapped c++ instance (this is done during
> destruction of ParentObject).
The Python destructor will not call the C++ destructor if the C++ instance
has a parent. If you think it does then provide a test case that
demonstrates it.
> I am wondering if this behavior is possible to achieve in SIP.
Phil
------------------------------
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‘She has never mentioned her father to me. Was he—well, the sort of man whom the County Club would not have blackballed?’ "We walked by the side of our teams or behind the wagons, we slept on the ground at night, we did our own cooking, we washed our knives by sticking them into the ground rapidly a few times, and we washed our plates with sand and wisps of grass. When we stopped, we arranged our wagons in a circle, and thus formed a 'corral,' or yard, where we drove our oxen to yoke them up. And the corral was often very useful as a fort, or camp, for defending ourselves against the Indians. Do you see that little hollow down there?" he asked, pointing to a depression in the ground a short distance to the right of the train. "Well, in that hollow our wagon-train was kept three days and nights by the Indians. Three days and nights they stayed around, and made several attacks. Two of our men were killed and three were wounded by their arrows, and others had narrow escapes. One arrow hit me on the throat, but I was saved by the knot of my neckerchief, and the point only tore the skin a little. Since that time I have always had a fondness for large neckties. I don't know how many of the Indians we killed, as they carried off their dead and wounded, to save them from being scalped. Next to getting the scalps of their enemies, the most important thing with the Indians is to save their own. We had several fights during our journey, but that one was the worst. Once a little party of us were surrounded in a small 'wallow,' and had a tough time to defend ourselves successfully. Luckily for us, the Indians had no fire-arms then, and their bows and arrows were no match for our rifles. Nowadays they are well armed, but there are[Pg 41] not so many of them, and they are not inclined to trouble the railway trains. They used to do a great deal of mischief in the old times, and many a poor fellow has been killed by them." As dusk came on nearly the whole population of Maastricht, with all their temporary guests, formed an endless procession and went to invoke God's mercy by the Virgin Mary's intercession. They went to Our Lady's Church, in which stands the miraculous statue of Sancta Maria Stella Maris. The procession filled all the principal streets and squares of the town. I took my stand at the corner of the Vrijthof, where all marched past me, men, women, and children, all praying aloud, with loud voices beseeching: "Our Lady, Star of the Sea, pray for us ... pray for us ... pray for us ...!" It had not occurred to her for some hours after Mrs. Campbell had told her of Landor's death that she was free now to give herself to Cairness. She had gasped, indeed, when she did remember it, and had put the thought away, angrily and self-reproachfully. But it returned now, and she felt that she might cling to it. She had been grateful, and she had been faithful, too.[Pg 286] She remembered only that Landor had been kind to her, and forgot that for the last two years she had borne with much harsh coldness, and with a sort of contempt which she felt in her unanalyzing mind to have been entirely unmerited. Gradually she raised herself until she sat quite erect by the side of the mound, the old exultation of her half-wild girlhood shining in her face as she planned the future, which only a few minutes before had seemed so hopeless. After he had gloated over Sergeant Ramsey, Shorty got his men into the road ready to start. Si placed himself in front of the squad and deliberately loaded his musket in their sight. Shorty took his place in the rear, and gave out: The groups about each gun thinned out, as the shrieking fragments of shell mowed down man after man, but the rapidity of the fire did not slacken in the least. One of the Lieutenants turned and motioned with his saber to the riders seated on their horses in the line of limbers under the cover of the slope. One rider sprang from each team and ran up to take the place of men who had fallen. "As long as there's men and women in the world, the men 'ull be top and the women bottom." Then, in the house, the little girls were useful. Mrs. Backfield was not so energetic as she used to be. She had never been a robust woman, and though her husband's care had kept her well and strong, her frame was not equal to Reuben's demands; after fourteen years' hard labour, she suffered from rheumatism, which though seldom acute, was inclined to make her stiff and slow. It was here that Caro and Tilly came in, and Reuben began to appreciate his girls. After all, girls were needed in a house—and as for young men and marriage, their father could easily see that such follies did not spoil their usefulness or take them from him. Caro and Tilly helped their grandmother in all sorts of ways—they dusted, they watched pots, they shelled peas and peeled potatoes, they darned house-linen, they could even make a bed between them. HoME一级毛片视频免费公开
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