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• C# Lambda Expression Speed

  - by Nathan

  I have not used many lambda expressions before and I ran into a case where I thought I could make slick use of one. I have a custom list of ~19,000 records and I need to find out if a record exists or not in the list so instead of writing a bunch of loops or using linq to go through the list I decided to try this: for (int i = MinX; i <= MaxX; ++i) { tempY = MinY; while (tempY <= MaxY) { bool exists = myList.Exists(item => item.XCoord == i && item.YCoord == tempY); ++tempY; } } Only problem is it take ~9 - 11 seconds to execute. Am I doing something wrong is this just a case of where I shouldn't be using an expression like this? Thanks.

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• iTunes Music Store Link Maker — how to search from within my app?

  - by prendio2

  I'm writing a music reference app and for each album (pulled from last.fm) would like to link to the ITMS (if the album is in the store). iTunes link maker web tool http://apple.com/itunes/linkmaker/ is great for getting links for a known album but I need to access it programatically from within my app. This NSLog blogpost which is from 2003 but was referenced more recently in another question here seems to offer the only solution I've come across so far, suggesting to submit a query to: phobos.apple.com/WebObjects/MZSearch.woa/wa/advancedSearchResults? Put "itms://" before it and the link will work in iTunes, put "http://" before it and the link will work in Camino (Safari sometimes spits back a malformed XML error). The tags that are of importance are as follows: songTerm - song title artistTerm - artist name albumTerm - album name composerTerm - composer name term - all fields The suggestion is that would using http:// rather than itms:// the server will return an XML document of results instead of opening iTunes but either way I am sent directly to iTunes. Is it possible to get back a list of results?

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• C: evaluate part of the string

  - by Halst

  I cant find an expression to evaluate a part of a string. I want to get something like that: if (string[4:8]=='abc') {...} I started writing like this: if (string[4]=='a' && string[5]=='b' && string[6]=='c') {...} but if i need to evaluate a big part of string like if (string[10:40] == another_string) {...} then it gets to write TOO much expressions. Are there any ready-to-use solutions?

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• how to write re-usable views in django?

  - by rz

  These are the techniques that I use regularly to make my views reusable: take the template_name as an argument with a default take an optional extra_context which defaults to empty {} right before the template is rendered the context is updated with the extra_context for further re-usability, call any callable in extra_context.values() whenever the view deals with a queryset, there is a queryset argument with a default whenever the view needs a particular object from the ORM, it attempts to fetch it using any "id" parameter in several ways (e.g. as a slug, as a database id) (this may be a bad practice...) First, Should I add anything to my list? Should I remove anything from my list? The items accommodates a large number of cases. However, whenever an app extends a model of another in some way (e.g. adding a field or changing the behavior in some way) I end up writing my own views and only reusing the model. Is this normal?

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• Function returns CSV File: How to go about checking it ?

  - by Rachel

  I am doing something like: $outputFile = getCurrentDBSnapshot($data); where $data is the resource stream that am passing in, basically from command prompt am passing an file and am opening it using fopen for writing with 'w+' permissions, now getCurrentDBSnapshot would get the current state of a table and would update the $data csv file, so basically $outputFile would be updated with the current state of database table, now I want to var_dump or print the value of $outputFile to see the data present into it. But when I do $this->fout = fopen($outputFile,'r') or die('Cannot open file'); $test = fgetcsv($outputFile,5000,":"); var_dump($test); It gives me an error saying that it expects parameter 1 to be a string type and am passing resource. My goal to see the contains of $outputFile and so my question is that How can I see the contains present in $outputFile or how can I see what getcurrentDBSnapshot function is returning me ?

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• To find first N prime numbers in python

  - by Rahul Tripathi

  Hi All, I am new to the programming world. I was just writing this code in python to generate N prime numbers. User should input the value for N which is the total number of prime numbers to print out. I have written this code but it doesn't throw the desired output. Instead it prints the prime numbers till the Nth number. For eg.: User enters the value of N = 7. Desired output: 2, 3, 5, 7, 11, 13, 19 Actual output: 2, 3, 5, 7 Kindly advise. i=1 x = int(input("Enter the number:")) for k in range (1, (x+1), 1): c=0 for j in range (1, (i+1), 1): a = i%j if (a==0): c = c+1 if (c==2): print (i) else: k = k-1 i=i+1

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• Sharing output streams through a JNI interface

  - by Chris Conway

  I am writing a Java application that uses a C++ library through a JNI interface. The C++ library creates objects of type Foo, which are duly passed up through JNI to Java. Suppose the library has an output function void Foo::print(std::ostream &os) and I have a Java OutputStream out. How can I invoke Foo::print from Java so that the output appears on out? Is there any way to coerce the OutputStream to a std::ostream in the JNI layer? Can I capture the output in a buffer the JNI layer and then copy it into out?

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• Delphi Search Edit Component

  - by Reber

  Hi, I need a delphi component for Delphi 2007 win32 that have features like Google search text box. ** While User writing search key it should fill/refresh the list with values, and user can select one of them. **User can go up and down list and can select one of them. **List should contain codes and text pair, so user can select text and I can get code for database operations. (Google can highlight the search text in List but I think it is not possible with Delphi 2007, so it is not excepted.) I tried Dev Express TcxMRUEdit, however it doesn't meet my needs

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• How to Add a File from my source tree to Maven Site

  - by Charles O.

  I have a Maven 2 RESTful application using Jersey/JAXB. I generate the JAXB beans from a schema file, where the schema file is in my resources directory, e.g., src/main/resources/foo.xsd. I want to include foo.xsd file in the generated Maven site for my project, so that clients can see the XML schema when writing RESTful calls. How can I include foo.xsd in the site? I could have a copy of the file in src/main/site/..., and then update my site.xml to point to it (or have a .apt whose contents point to it), but I don't like that because I'm still tweaking foo.xsd, and don't want to have to remember to copy it each time I update it. And that's just bad practice. I also tried having a .apt file that has a link to the foo.xsd which gets copied to the target/classes directory. That works until I do a site:deploy, because that only copies the target/site directory. Thanks, Charles

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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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• Socket Communication in C#- IP-Port

  - by Ahmet Altun

  I am testing my socket programs at home, in local network. Server and client programs are running on seperate machines. Server program socket is binded as: serverSocket.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8999)); Client program (on the other computer) is connected as: clientSocket.Connect(IPAddress.Parse("192.168.2.3"), 8999); Why can Client not communicate with server? Do I need to make some firewall configuration or something like that? Or am I writing Server Ip incorrectly to the Client? (I got it from cmd-ipconfig of server)

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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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• Twitter API and rate limiting - I am confused

  - by jeffreyveon

  I am new to the Twitter API, and I looked at their whitelisting policies and I am a little confused... I'm basically writing a twitter aggregrator that crawls the public tweets of a set of users (not more than 200) hourly. I wanted to apply for whitelisting, and they seem to offer account based and IP based whitelisting. Since I am using a shared hosting, my outbound IP address might vary (and twitter does'nt allow IP ranges for whitelisting). So I am considering using account based whitelisting. However, while using OAuth, is it possible for me to use account based whitelisting for a background process that crawls the API hourly?

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• Simulating mouse clicks on Mac OSX does not work for some applications.

  - by Thomi

  Hi, I'm writing an App for Mac OSX 10.6 and later in C++. One part of theapp needs to simulate mouse movement and mouse clicks. I do this currently by posting CGEvent objects using CGEventPost(kCGHIDEventTap, event);. This works, for the msot part - I can simulate mouse movement and clicks just fine, but it seems to fail in some areas. For example: In Mozilla firefox & Safari, I can click on all the menus, but cannot click on a link within a website. When I try, the link is highlighted, but the browser never follows the link. However, I can right-click on a link, select "open link in new tab", and everything works as expected. I can click on the "Dashboard" icon to brink up the dashboard, but I cannot click on the "i" button on any of the dashboard widgets. This inconsistency is along application boundaries - Does anyone have any idea what the cause might be?

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• Simulating mouse clicks on Mac OSX does not work for some applications.

  - by Thomi

  Hi, I'm writing an App for Mac OSX 10.6 and later in C++. One part of theapp needs to simulate mouse movement and mouse clicks. I do this currently by posting CGEvent objects using CGEventPost(kCGHIDEventTap, event);. This works, for the msot part - I can simulate mouse movement and clicks just fine, but it seems to fail in some areas. For example: In Mozilla firefox & Safari, I can click on all the menus, but cannot click on a link within a website. When I try, the link is highlighted, but the browser never follows the link. However, I can right-click on a link, select "open link in new tab", and everything works as expected. I can click on the "Dashboard" icon to brink up the dashboard, but I cannot click on the "i" button on any of the dashboard widgets. This inconsistency is along application boundaries - Does anyone have any idea what the cause might be?

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• Is using jquery to call a WCF Data Service from the UI violating the MVC pattern.

  - by Lee Dale

  I'm fairly new to ASP.Net MVC 2 and understand the MVC pattern in itself. But my question is what's the best way to populate dropdownlists in the UI sticking to the MVC pattern. Should I be going through the controller? Every article I've seen to do this shows how to do it using javascript and jquery. I have a test application that I'm re-writing in MVC2 I have my dropdowns working with jquery basically calling a WCF Data Service that returns JSON which populates the dropdowns. Seems to me though that this is bypassing the controller and going straight to the model therefore strictly violating the MVC pattern. Or am I missing something obvious here. You thoughts or best practices would be greatly welcome here. Thanks

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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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• 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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• 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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• 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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• 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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• 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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• 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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