Well thank you to all who replied - that's much clearer now. By the time I'm
finished with Python, I sweat I'm going to be half-way towards knowing C/C++
as well, as so many docs (even the O'Reilly books) seem to assume you're
coming from it, and explain everything in terms of it! Anyway, I understand that
all now, and I've worked out how to use it which is the important thing :)
There's one other thing that has puzzled me lately, and I can only assume
that it's either a misunderstanding or a bug on my part. I've got some code
which, on the push of a button, scans the DVD device, then populates the
ListView with items for each track. Currently, the code works like so:
----
print "Scanning DVD"
(popen command to get number of tracks)
for i in range(numtracks):
(popen command to get track info)
print (info about track)
(add ListViewItem)
print "Finished"
----
Now I would expect that the ListViewItems would appear one by one as the for
loop scans each track. But what happens is that it prints out the info for
each track as it goes along, but only populates the ListView with the items
when it's done. Why is this?
Thanks again!
Tom
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>> On Tuesday 25 February 2003 01:13, Tom Chance wrote:
> > Hello,
> >
> > I've only just started out with PyQt, so please bear with me as I ask
> some
> > boring questions :)
> >
> > I've been reading through the book "GUI Programming with Python: QT
> > Edition" by Boudewijn Rempt online (the paper copy is just too expensive
> > for a poorly student like me :-), and though it covers a lot of ground,
> > it's written in a very confusing order, jumping around between ideas.
>> I guess it doesn't help that the online version misses all screenshots
> and the helpful titlepages between sections. Start with
> http://www.opendocs.org/pyqt/index.lxp?lxpwrap=c1036%2ehtm, that shows
> how to write a simple script to start with.
>> > Anyway, enough rambling. I'm using Qt Designer to create my GUI, and I'm
> > then importing the class in my main program file. At the moment, the
> main
> > program file contains one class that inherits the GUI class, and that
> > contains all my functions. I'm sure this isn't the best way to do things
> -
> > I'm used to creating multiple classes, each one for a different task,
> and
> > it seems a little messy having all my function code in one class. What's
> > the best way of laying out the code?
>> Doesn't matter much. You don't even need to inherit the gui class; there
> are cases where simple instantiation is enough, if you connect the signals
> >from the gui class widgets to slots in your own code.
>>> >
> > Also, I'm struggling with connecting signals and slots. I understand the
> > principle, and I'm getting the hang of working wiht Qt Designer and my
> code
> > to create empty functions in Designer, and then create the actual
> functions
> > in my main code, but I don't really understand the signal parameter in a
> > connection.
> >
> > E.g. I can guess what "pressed(QListViewItem*)" means? But why the
> > QListViewItem with an asterisk? And what really confuses me is the "int,
> > const Qstring&" stuff. What do they signify, and why are they in the
> signal
> > for a rightButtonClicked(), whilst clicked() has no parameters, and
> pressed
> > only has QListViewItem?
> >
>>> The signal parameter from C++ signals is a simple name. In C++, the
> parameters
> define the kind of data passed to the slot; but in Python it's simply used
> to
> distinguish between signals with the same name but different parameter
> lists.
> The funny things, like int, & and * are simply copied from C++, where they
> denote the type of parameter. They're present in the Python bindings
> because
> it makes it easier to use the Qt C++ docs.
>>> > Back to the docs for now!
> >
>> You might also want to take a look at the tutorial I wrote for Dr Dobbs
> (January 2001 issue), which covers the first steps and principles, but in
> a lot less detail than the book.
>> - --
> Boudewijn Rempt | http://www.valdyas.org/index2.html
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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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