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• How can I find a Qt metaobject instance from a class name?

  - by axilmar

  Is there a way to find the QMetaObject instance of a class, given the class name? what I like to do is to load objects from disk, but for this to happen, I need a way to retrieve a QMetaObject instance using the name of a class, in order to use the QMetaObject to create an instance.

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• XNA Level config file in C#

  - by Midday

  I'm working on as small game for class and was wondering what is a easy way to handel level configuration files. Like object placements , names, etc. I'm new to C# but fluent in Java, Ruby. so XML? YML? text, serialized objects?

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• Finding a small image in a bigger one

  - by tur1ng

  Given an image with a large dimension ( 1.000 x 1.000). What is a good approach to find a small image (e.g. 50 x 50) in the big one? The smaller image can be rotated and differ in the size, but only with a 1:1 ratio. It's not related to any programming language - I'm just interested in pattern recognition. Thank you.

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• Mapping of interconnection with nhibernate

  - by Mauro Destro

  I have to describe interconnection between objects. public class Entity { public string Name {get;set;} public IList<Entity> Connections {get;set;} } How can i persist this? I add another layer of complexity: querying on a specific date a connection between two entities can't be already defined. So probably I need a support table that contain a structure like Id, Source, Destination, ValidFrom, ValidUntil Mauro

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• touchesEnded Sound?

  - by NextRev

  I'm trying to play a sound on touchesEnded but I'm having a problem. There are multiple objects that get moved around, so if the below code holds true when any object is moved, it constantly plays the sound. How do I only play it once? -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ if(CGRectContainsRect([image1 frame], [image2 frame])){ [self playsound]; } }

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• Memory efficient int-int dict in Python

  - by Bolo

  Hi, I need a memory efficient int-int dict in Python that would support the following operations in O(log n) time: d[k] = v # replace if present v = d[k] # None or a negative number if not present I need to hold ~250M pairs, so it really has to be tight. Do you happen to know a suitable implementation (Python 2.7)? EDIT Removed impossible requirement and other nonsense. Thanks, Craig and Kylotan! To rephrase. Here's a trivial int-int dictionary with 1M pairs: >>> import random, sys >>> from guppy import hpy >>> h = hpy() >>> h.setrelheap() >>> d = {} >>> for _ in xrange(1000000): ... d[random.randint(0, sys.maxint)] = random.randint(0, sys.maxint) ... >>> h.heap() Partition of a set of 1999530 objects. Total size = 49161112 bytes. Index Count % Size % Cumulative % Kind (class / dict of class) 0 1 0 25165960 51 25165960 51 dict (no owner) 1 1999521 100 23994252 49 49160212 100 int On average, a pair of integers uses 49 bytes. Here's an array of 2M integers: >>> import array, random, sys >>> from guppy import hpy >>> h = hpy() >>> h.setrelheap() >>> a = array.array('i') >>> for _ in xrange(2000000): ... a.append(random.randint(0, sys.maxint)) ... >>> h.heap() Partition of a set of 14 objects. Total size = 8001108 bytes. Index Count % Size % Cumulative % Kind (class / dict of class) 0 1 7 8000028 100 8000028 100 array.array On average, a pair of integers uses 8 bytes. I accept that 8 bytes/pair in a dictionary is rather hard to achieve in general. Rephrased question: is there a memory-efficient implementation of int-int dictionary that uses considerably less than 49 bytes/pair?

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• WPF ItemsControl binding and the item order

  - by user109534

  I have ItemsControl in a WPF application, which is bind to an array of objects. And I am using ItemTemplate to render the list. I want to display for each item in the list the item order, like for example Customer 1 Name : xxxxx Age: 9999 Customer 2 Name : yyyy Age: 8888 Any idea how to do it Thanks

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• Can I create an ASP.NET MVC 2 project with multiple areas without referencing each Child in the pare

  - by No Refunds No Returns

  This is a follow-up question to my original query: http://stackoverflow.com/questions/1791605/how-can-i-use-multiple-projects-to-separate-a-large-asp-net-mvc-site-into-departm Now that I have this working, is there a way to still have multiple project but not have to reference each child area from the parent project? Ideally I'd like to be able to have multiple, separate and distinct projects that only come together on the production/test machines. I should be able to build and test each "area" separately.

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• Int128 in .Net?

  - by Adam Tegen

  I need to do some large integer math. Are there any classes or structs out there that represent a 128-bit integer and implement all of the usual operators? BTW, I realize that decimal can be used to represent a 96-bit int.

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• Multi-thread conversation in django (like Reddit)

  - by dotty

  Hay, i have an app which essentially a conversation system (much like reddits) Where a post can have multiple replies, and a reply and have multiplies, and a reply to a reply can have multiple replies (etc) I've made the model like this class Discussion(models.Model): message = models.TextField() replies = models.ManyToManyField('self') and the view discussions = Discussions.objects.all() and the template looks like this {% for discussion in discussions %} {{ discussion.message }} {% endfor %} How would i go about making a system where i can output all replies like this discussion reply reply reply reply reply reply Which would go down as far as it needs to to ensure all replies are listed. Thanks

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• efficient list mapping in python

  - by Joey

  Hi everyone, I have the following input: input = [(dog, dog, cat, mouse), (cat, ruby, python, mouse)] and trying to have the following output: outputlist = [[0, 0, 1, 2], [1, 3, 4, 2]] outputmapping = {0:dog, 1:cat, 2:mouse, 3:ruby, 4:python, 5:mouse} Any tips on how to handle given with scalability in mind (var input can get really large).

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• lua userdata gc

  - by anon

  Is it possible for a piece of lua user data to hold reference to a lua object? (Like a table, or another piece of user data?). Basically, what I want to know is: Can I create a piece of userdata in such a way taht when the gc runs, the user data can say: "Hey! I'm holding references to these other objects, mark them as well." Thanks!

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• jQuery plug-in for text zoom?

  - by Konstantin

  Hey, anyone knows a jQuery plug-in for text zoom a-la MAC OS X "Large Type" function in Address Book? I'd use it for the same situation - to show full-screen phone number after clicking on it. Cheers

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• Design Principles, Best Practices and Design Patterns for C (or Procedural Programming in general)?

  - by Dimi

  Are there any known design principles, best-practices and design patterns that one can follow while designing a C project? Or useful design principles for procedural (imperative) programming in general? (I'm child of the 'object-oriented generation' and have to design a large C project for the first time)

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• Migrate clearcase to perforce

  - by stimms

  I have a large quantity of clearcase data which needs to be migrated into perforce. The revisions span the better part of a decade and I need to preserve as much branch and tag information as possible. Additionally we make extensive use of symbolic links, supported in clearcase but not in perforce. What advice or tools can you suggest which might make this easier?

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• Interesting issue with ScriptManager timeout value happens only in win2k machines

  - by jg

  When I set the Asyncpostbacktimeout value to a large value like 3600000000, the scriptmanager throws a timeout exception (it throws the error almost immediately after user action which triggers ajax request, so it is not timing out because the server is not responding). If I reset this value to some sane number like 3600 or even 36000, it works fine. AJAx content is getting updated in the page. This weirdness happens only in windows 2000 machines and does not happen in XP machines Any thoughts ?

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• C# - Pan cursor

  - by Ash

  I'm implementing panning of a large image in a PictureBox control, and I have no problem setting the appropriate directional pan cursors. However, I can't seem to find the image used for the origin of the pan (a circle with arrows inside of it). Where can I find it?

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• does the concept of flow apply to tcp as well as udp?

  - by liv2hak

  I have a very large network trace file which contains both tcp and udp packets.I want to find out the flows in the trace file.For that I have a hash function which takes in source ip address,destination ip address,source port,destination port and protocol.In case of TCP I can understand that the flow means all the packets which have the same 5 parameters same.But what does it mean in case of UDP.how does the concept of flow apply in case of UDP.? I am a novice in packet processing.

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• What is the minimum interface that has the Count property in .Net

  - by SoMoS

  Hello, I need to change a method that has one parameter that takes a serie of objects. I need to find the lowest Interface (in inheritance tree) that has the Count property. Until now I was using the IEnumerable but as this has not Count I need to change it to the wider interface possible so the method can work with the biggest number of types of series (collections, lists, arrays, etc). Thanks in advance.

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• Print a specific image from webpages without popup window or new window?

  - by jackrobert

  Hi, Is there any possible to print a specific image from webpages without popup window or new window? Suppose i have four images in my application. Just i need to print second image only. And also i want to implement large page like some textarea, some text box, more images etc... So many code available with pop up window or new window. please help me about this. Thanks in advance.

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• C# XPath id() not working?

  - by Iggyhopper

  I'm using C# and I'm stumped. Does it just not support id()? I have a large XML file, about 4-5 of them at ~400kb, so I need some speed and performance wherever I can get it. I use XmlDocument.SelectSingleNode("id('blahblahblah')") and it doesn't get the node by id. Am I going crazy or is it that C# XPath just doesn't support id()?

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• What sort of programming paradigm is usually used between web and application server in PHP n-tier a

  - by Alex

  What sort ort of programming paradigm (sockets,RPC,Web services,Distributed objects middleware) is usually used between web server and application server in PHP n-tier architecture?Whats the difference of using DOM or Web services for this purpose?

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• How to tile a 30000 x 6000 image for a 480 x 320 screen?

  - by Horace Ho

  (this is related to another question about implementation on iPhone) I have a large image, size around 30000 (w) x 6000 (h) pixels. You may consider it's like a big map. I assume I need to crop it up into smaller tiles. Questions: what is the tile strategy? Requirements: whole image (though cropped) can be scrolled up/down/left/right by swipes zoom in (up to pixel-to-pixel) out (down to screen-fit-by-height) by the 2-finger operation memory efficiency by lazy loading tiles Thanks!

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• Java3d resetting to a new scene

  - by Dan Howard

  Hi all, I'm working on a game in Java3D. I read all my level info from a file and it works fine. But now I want to re-initialize the scene from reading data from a different file. How do I reset the scene? Should I just destroy the whole canvas3D and universe objects?

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• How to put an InlineFormSet into a ModelFormSet in Django?

  - by Jannis

  Hi, I'd like to display a number of forms via a ModelFormSet where each one of the forms displays in turn InlineFormSets for all objects connected to the object. Now I'm not really sure how to provide the instances for each ModelFormSet. I thought about subclassing BaseModelFormSet but I have no clue on where to start and would like to know whether this is possible at all before I go through all the trouble. Thanks in advance!

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