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• Creating an iphone book application

  - by ennuikiller

  I have some experience creating iphone applications and would now like to create an iphone book application. Browsing the Book category in iTunes it seems to there is a standard format for building these apps, however, googling for how to build an iphone book app produces no useful results. This type of application is also not addressed in any of the iphone development books I've seen. Is there a standard method fot building these book applications? Or is it simply copying the text is some format (pdf, txt, html?) and then writing a document handling api? It seems there already must exist apis for doing this. Can anyone point me in the right direction. Thanks in advance!

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• Windows Media Center 6 Development on Vista

  - by Clever Human

  I have two development machines -- one is Windows 7, the other is Windows Vista. Depending on where I am in my house is which machine I use. I am writing a Windows Media Center 6 (which ships as part of Windows 7) application. I installed the WMC6 SDK on my Windows 7 machine with no issues. However, when I try and install it on my Vista machine, I am told the WMC6 SDK cannot be installed on Vista. So my questions are: How can I develop a WMC6 app on Vista? If I use the Vista version of the SDK (WMC5.3 SDK) will I be able to edit / compile and test the same application from each machine. I imagine the answer to the second question is "no" because the API changed between those two versions. So can I only work on this application from my Windows 7 machine? That really sucks if it is true!

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• Simple Properties in Objective-C Classes

  - by tarnfeld

  Hey, I've bene working with Objective-C for a while now, and so far I have never really needed to craft my own classes, properly. I am a bit confused with the two arguments you can give the @property(a, b) declaration in a header file. When creating outlets to Interface Builder I usually do @property(nonatomic, retain) but I have no idea what this means. I'm writing a simple class which has a set of properties which will be set from the outside, like [instance setName:@"Bla Bla Bla"]; or I guess like instance.name = @"Bla@" but I would rather the first option. How would I declare this kind of property on a class? Thanks in advanced! Sorry for the n00bish question :-)

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• How to check a local wifi connection

  - by Thomas Joos

  hi all, I'm writing an app which connects to a static ip adress in a local network. How can I check if I have a local network connection? I want to connect to http://192.168.2.5 and i tried using the Rechability class but it returns FALSE, while the device is definately connected ( when i don't do the check, the app works fine so there is a connection ): Reachability *r = [Reachability reachabilityWithHostName:@"http://192.168.2.5"]; NetworkStatus internetStatus = [r currentReachabilityStatus]; How should work this out? Thomas

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• Cython Speed Boost vs. Usability

  - by zubin71

  I just came across Cython, while I was looking out for ways to optimize Python code. I read various posts on stackoverflow, the python wiki and read the article "General Rules for Optimization". Cython is something which grasps my interest the most; instead of writing C-code for yourself, you can choose to have other datatypes in your python code itself. Here is a silly test i tried, #!/usr/bin/python # test.pyx def test(value): for i in xrange(value): i**2 if(i==1000000): print i test(10000001) $ time python test.pyx real 0m16.774s user 0m16.745s sys 0m0.024s $ time cython test.pyx real 0m0.513s user 0m0.196s sys 0m0.052s Now, honestly, i`m dumbfounded. The code which I have used here is pure python code, and all I have changed is the interpreter. In this case, if cython is this good, then why do people still use the traditional Python interpretor? Are there any reliability issues for Cython?

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• emacs & icicles: auto-completion from a dictionary?

  - by Mica

  I just installed icicles with emacs, and so far I am liking it a lot. I'm not entirely sure if this is possible, but I would like to implement (or use, if it already exists) a feature in icicles that would auto-complete words from an English dictionary. So, if I'm writing something and need a word that rhymes with floor, I can type in *or, or even better, for alliteration, type in flo* and have it return all the words from the dictionary that start with flo Questions: Does something like this exist? If it does not exist, what would be the best way to go about this? Should I somehow hook into aspell? Or just index a long file of words?

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• Cropping an image, saving output to a new file and get crop coordinates

  - by synic

  I'm interfacing with a service that allows you to upload an image, and also upload coordinates of a thumbnail of that image. I'm thinking that (if there isn't some sort of prefab Activity specifically for this) that I can use Android's crop utility. The only problem is that I can't overwrite the original file, the crop window needs to have a custom message (instead of "crop image"), and I'll need the coordinates of the crop. Is this possible? Is there another way to do this without writing my own Activity?

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• "cannot concatenate 'str' and 'list' objects" keeps coming up :(

  - by ratce003

  I'm writing a python program and passing in a html template but an error keeps coming up, "cannot concatenate 'str' and 'list' objects" here is is the program: #!/usr/bin/env python # -*- coding: UTF-8 -*- # enable debugging import cgi import cgitb cgitb.enable() def template(file, **vars): return open(file, 'r').read() % vars print "Content-type: text/html\n" print form = cgi.FieldStorage() # instantiate only once! num_1 = form.getfirst('num_1') num_2 = form.getfirst('num_2') int1r = str(num_1) int2r = str(num_2) def calc_range(int2r, int1r): start = range(int2r, int1r + 1) end = range(1, int2r) return start+end int1 = int(int1r) int2 = int(int2r) out_str = '' for i in range(0, int1): first_line_num = (int2 + i) % int1 if first_line_num == 0: first_line_num = int1 line = calc_range(first_line_num, int1) out_str += line print template('results.html', output=out_str, title="Latin Squares")

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• Video Synthesis - Making waves, pattern, gradients...

  - by Nathan

  I'm writing a program to generate some trippy visuals. My code paints each pixel with a random blue value which loops at 0.04 second intervals. for (y = 0; y < 5.5; y += 0.2) { for (x = 0; x < 7.5; x += 0.2) { b = rand() / ((double) RAND_MAX); setPixelColor(x,y,r,g,b); } } I'd like to do more than just make blue noise... but my maths is a bit rusty, and Google isn't helping me much today, so it would be great if you could share anything you know about making waves, patterns, gradient animations, etc or links to such material.

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• Is Oracle AQ/Streams of any use in my situation?

  - by RenderIn

  I'm writing a workflow system that is driven entirely at each step by explicit human interaction. That is, a task is assigned to a person, that person selects from a few limited options {approve, reject, forward}, and then it is either sent along to the next person or terminated. Just curious of Oracle Streams/AQ has anything to offer over flat tables managed by regular web application code. The amount of processing after each action is fairly limited and the volume is not terribly high, so there's not really a need to throttle things by throwing them into a queue. What are some of the benefits of introducing a queue structure, or is it overkill for my situation?

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• Django QuerySet filter + order_by + limit

  - by handsofaten

  So I have a Django app that processes test results, and I'm trying to find the median score for a certain assessment. I would think that this would work: e = Exam.objects.all() total = e.count() median = int(round(total / 2)) median_exam = Exam.objects.filter(assessment=assessment.id).order_by('score')[median:1] median_score = median_exam.score But it always returns an empty list. I can get the result I want with this: e = Exam.objects.all() total = e.count() median = int(round(total / 2)) exams = Exam.objects.filter(assessment=assessment.id).order_by('score') median_score = median_exam[median].score I would just prefer not to have to query the entire set of exams. I thought about just writing a raw MySQL query that looks something like: SELECT score FROM assess_exam WHERE assessment_id = 5 ORDER BY score LIMIT 690,1 But if possible, I'd like to stay within Django's ORM. Mostly, it's just bothering me that I can't seem to use order_by with a filter and a limit. Any ideas?

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• Search select statement

  - by Nana

  I am creating a page which would have different field for the user to search from. e.g. search by: Grade: -dropdownlist1- Student name: -dropdownlist2- Student ID: -dropdownlist3- Lessons: -dropdownlist4- Year: -dropdownlist5- How do I write the select statement for this? Each dropdownlist would need a select statement which would extract out different data from the database. But, I want to write ONE select statement which can dynamically choose the dropdownlist options. Instead of writing many many select statement. Lets say; Grade: -dropdownlist1- ; default value(all) Student name: -dropdownlist2-; default value(all) Student ID: -dropdownlist3-; 0-100 is choosen Lessons: -dropdownlist4-; A-C is choosen Year: -dropdownlist5-; 2009 is choosen

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• custom MSSQL driver

  - by hoodoos

  I had a crazy thought about writing my own MSSQL driver to make it work something like non-blocking http client, so it won't be thread thirsty and could handle lots of db queries within one thread. I tried to look over google for some guidelines about implementing MSSQL client protocol, but found none really, where do those guys get information about it when they write own implementations for PHP or python? I need a really low level to be documented so I can implement all phases of working with a connection through sockets. And would be really nice to have a an example in c# langauge. :)

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• Does a multithreaded crawler in Python really speed things up?

  - by beagleguy

  Was looking to write a little web crawler in python. I was starting to investigate writing it as a multithreaded script, one pool of threads downloading and one pool processing results. Due to the GIL would it actually do simultaneous downloading? How does the GIL affect a web crawler? Would each thread pick some data off the socket, then move on to the next thread, let it pick some data off the socket, etc..? Basically I'm asking is doing a multi-threaded crawler in python really going to buy me much performance vs single threaded? thanks!

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• WP plugin based on useragent

  - by jake

  I am writing a plugin which does some js stuff, but does not work for other browsers than FF . I've thought why not execute the plugin for the browsers which support it. I've added the code, but for some reason when I activate the plugin and check the site with a FF all I get is blank page. If I visit with a IE the site is shown correctly. Basically my code is like this $agent= strtolower($_SERVER['HTTP_USER_AGENT']); if (preg_match('/firefox/',$agent)){ include(plugins_url('script.js',FILE)); some more code } So when I visit with FF I get blank page, when I visit with IE the blog loads normally

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• not readable PDF files

  - by Michal_R

  Hello, I am writing Master's thesis - NLP system. I have one component - extractor. It is extracting a plain text from PDF files. There are a few PDF files that can not be extracted correctly. Extractor (PDFBox library) returns a string like this: "¦xDn¦if|d+gDF"Ti&cD+lh d FÁhis~n +xd f«"d¦ffih »h" or "10a61a91a22a25a3a27a17a23a20a8a13a14a61a25a17" I was checking each file that makes this extraction's problem and all these files' text also can not be copy-pasted from PDF Reader (Adobe Reader and FoxIt reader). Viewing them in this readers is enabled, but after selecting its content and copying to the clipboard I get the same wrong text (as described above - strings of not semanticaly correct chars or strings of digits and letters) Could anybody help me??? THX :)

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• Looking for popUpMenuPositioningItem:atLocation:inView: equivalent for 10.5

  - by Daniel Jette

  I'm working on an application that needs to display a context menu on screen in various scenarios. In the function I'm writing, I don't have access to any NSWindows or NSViews. I'd like to use popUpMenuPositioningItem:atLocation:inView as this function works perfectly for me in 10.6. However, we have a requirement to support 10.5, so this function isn't available to me. The feature I'm most interested in, as stated in the documentation is: If view is nil, the location is interpreted in the screen coordinate system. This allows you to pop up a menu disconnected from any window. Basically, I need to display the context menu given a location on screen, but without any associated view. Is there any way to achieve this on 10.5?

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• AS3: How to access pixel data efficiently?

  - by JonoRR

  I'm working a game. The game requires entities to analyse an image and head towards pixels with specific properties (high red channel, etc.) I've looked into Pixel Bender, but this only seems useful for writing new colors to the image. At the moment, even at a low resolution (200x200) just one entity scanning the image slows to 1-2 Frames/second. I'm embedding the image and instance it as a Bitmap as a child of the stage. The 1-2 FPS situation is using BitmapData.getPixel() (on each pixel) with a distance calculation beforehand. I'm wondering if there's any way I can do this more efficiently... My first thought was some sort of spatial partioning coupled with splitting the image up into many smaller pieces. I also feel like Pixel Bender should be able to help somehow, however I've had little experience with it. Cheers for any help. Jonathan

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• editing a file with vim that has no EOL marker on the last line but has CRLF line endings

  - by rmeador

  I often have to edit script files, the interpreter for which treats files that have an EOL marker on the last line of the file as an error (i.e. the file is treating CRLF as "newlines", not as "line endings"). Currently, I open these files in Vim using binary mode (-b on the command line). It autodetects the lack of EOL on the final line and sets the "noeol" option appropriately, which prevents it from writing an EOL on the last line. Because the file has CRLF line endings, I get lots of ^Ms at the end of my lines (because it interprets only Unix-style line endings in binary mode, it seems). I can't open it in text mode because the "noeol" option is ignored for non-binary files. This is very annoying, and I always have to remember to manually type the ^M at the end of each line! Is there some way I can force it to accept DOS-style line endings in binary mode, or force it to listen to the EOL option in text mode?

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• Get last n lines of a file with Python, similar to tail

  - by Armin Ronacher

  I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom. So I need a tail() method that can read n lines from the bottom and supports an offset. What I came up with looks like this: def tail(f, n, offset=0): """Reads a n lines from f with an offset of offset lines.""" avg_line_length = 74 to_read = n + offset while 1: try: f.seek(-(avg_line_length * to_read), 2) except IOError: # woops. apparently file is smaller than what we want # to step back, go to the beginning instead f.seek(0) pos = f.tell() lines = f.read().splitlines() if len(lines) >= to_read or pos == 0: return lines[-to_read:offset and -offset or None] avg_line_length *= 1.3 Is this a reasonable approach? What is the recommended way to tail log files with offsets?

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• c# binarysearch a list<T> by a member of T

  - by Pygmy

  I have a baseclass Event with a DateTime member TimeStamp. Lots of other event-classes will derive from this. I want to be able to search a list of events (that can contain events with duplicate timestamps) fast, so I'd like to use a binary search. So I started out writing something like this : public class EventList<T> : List<T> where T : Event { private IComparer<T> comparer = (x, y) => Comparer<DateTime>.Default.Compare(x.TimeStamp, y.TimeStamp); public IEnumerable<T> EventsBetween(DateTime inFromTime, DateTime inToTime) { // Find the index for the beginning. int index = this.BinarySearch(inFromTime, comparer); // BLAH REST OF IMPLEMENTATION } } The problem is that the BinarySearch only accepts T (so - an Event type) as parameter, while I want to search based on a member of T - the TimeStamp. What would be a good way to approach this ?

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• how to autocomplete library class function in Xcode

  - by Bruce Ling

  Hi, I am new to Xcode. I am writing a C++ command line project. I used to use netbean. For example if I use a string, then I should be able to invoke the string library API function in a popup list for me to choose to autocomplete. So now I don't know how to do that in Xbox. Can some one help? My question is specific: how to find out the library function API? Thanks.

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• EJB 3 Session Bean Design for Simple CRUD

  - by sdoca

  I am writing an application that's sole purpose in life is to do CRUD operations for maintaining records in database. There are relationships between some of the tables/entities. Most examples I've seen for creating session beans deals with complex business logic/operations that interact with many entities which I don't have. Since my application is so very basic, what would be the best design for the session bean(s)? I was thinking of having one session bean per entity which had CRUD the methods defined. Then I thought of combining all of those session beans into a single session bean. And then I found this blog entry which is intriguing, but I must admit I don't understand all of it (what is a ServiceFacade?). I'm leaning towards session bean/entity class, but would like to hear more experienced opinions. Thanks.

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• How to do pointer work with accessor methods in Objective-C

  - by Jasconius

  Basic problem statement: I have a very good reason for doing some pointer fanciness in an app where I need to pass a decimal by reference. So I have a class which stores many a decimal, so let's say is has a property as such: @property (nonatomic) double myDecimalValue; I want to pass it by reference to some other class. [someOtherObject sendMyDecimalByReference:&myDecimalValue]; But, a problem emerges! The way that actually has to be written (because it's a property) is [someOtherObject sendMyDecimalByReference:&decimalOrigin.myDecimalValue]; This fails to compile in objective-c I get around it by writing the following - (double *) myDecimalValueRef; [someOtherObject sendMyDecimalByReference:[decimalOrigin myDecimalValue]]; Except I have dozens of these decimals and I don't want to write that stupid wrapper function for every value. Is there a shorthand way to do this in Objective-C using just the Getter functions? Let's just assume I have a great reason for not using NSNumber. Thanks!

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• C++/CLI .ToString() returning error

  - by George Johnston

  I am a beginner to C++/CLI as I come from a C# background. I am currently writing a wrapper for some native C++ code. I have the following methods: void AddToBlockList(System::String^ address) { char* cAddress = (char*)(void*)Marshal::StringToHGlobalAnsi(address); _packetFilter->AddToBlockList(cAddress); } void AddToBlockList(IPAddress^ address) { char* cAddress = (char*)(void*)Marshal::StringToHGlobalAnsi(address.ToString()); _packetFilter->AddToBlockList(cAddress); } ...The first method works fine and converts my string into the character array. However, the second function with the IPAddress object as the signiture gives me the following error: error C2228: left of '.ToString' must have class/struct/union ...When I type ? address.ToString() ...in the command window, the IP Address prints. Not sure where I'm going wrong. Any ideas?

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