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• How can I extract the nth occurrence of a match in a Perl regex?

  - by Zaid

  Is it possible to extract the n'th match in a string of single-quoted words? use strict; use warnings; my $string1 = '\'I want to\' \'extract the word\' \'Perl\',\'from this string\''; my $string2 = '\'What about\',\'getting\',\'Perl\',\'from\',\'here\',\'?\''; sub extract_quoted { my ($string, $index) = @_; my ($wanted) = $string =~ /some_regex_using _$index/; return $wanted; } extract_wanted ($string1, 3); # Should return 'Perl', with quotes extract_wanted ($string2, 3); # Should return 'Perl', with quotes

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• How can I generate an Expression tree that queries an object with List<T> as a property?

  - by David Robbins

  Forgive my clumsy explanation, but I have a class that contains a List: public class Document { public int OwnerId { get; set; } public List<User> Users { get; set; } public Document() { } } public class User { public string UserName { get; set; } public string Department { get; set; } } Currently I use PredicateBuilder to perform dynmica queries on my objects. How can I turn the following LINQ statement into an Expression Tree: var predicate= PredicateBuilder.True<User>(); predicate= predicate.And<User>(user => user.Deparment == "HR"); var deptDocs = documents.AsQueryable() .Where(doc => doc.Users .AsQueryable().Count(predicate) > 0) .ToList(); In other words var deptDocs = documents.HasUserAttributes("Department", "HR").ToList();

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• Android Market, Search results position Mystery.

  - by Paul G.

  How is an app's position in the Android Market search results determined? Is it as mysterious and complex as Google Web search results? We obviously don't want to change any words in our app's title or description that would hurt our position. Same question applies for not only search results, but when clicking on a Category in the Android Market. How is the order of the list determined? Hopefully someone here can help. I would think that Google would have published some guidelines at least that could help, but I haven't found anything yet.

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• Special characters in PHP / MySQL

  - by Jonathan

  Hi, I have in the database words that include special character (in Spanish mostly, like tildes). In the database everything is saved and shown correctly with PHPmyAdmin, but when I get the data (using PHP) and display it in a browser, I get a weird character, like a "?" with a square... I need a general fix so I don't need to escape each character every time, and also I would be able to insert special Spanish characters from a PHP form into the database... The HTML is correct: <meta http-equiv="content-type" content="text/html; charset=utf-8" /> All tables and databas are set to utf8_spanish The character I get: ? Any suggestions??? Thanks!!!

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• Real time web services

  - by daliz

  Hi everybody, I have a little (maybe the answer could require a book) question about web services and server side programming. But first, a little preamble. Recently we have seen new kind of applications & games using some kind of real-time interaction with a database, or more generally, with other users. I'm talking about shared drawing canvas, games like this , or simple chats, or the Android app "a World of Photo", where in real time you see who is online, to share your photos, etc. Now my question: Are all these apps based on classic TCP client/server architectures or is there a way to make them in a simpler way, like a web platform like LAMP? What I'm asking, in other words is: Can PHP+MySQL (or JSP, or RoR, or any other server language) provide a way to make online users communicate in real time and share data? Is there a way to do that without the ugly and heavy mechanism of temporary tables? Thank you! I hope I've been clear.

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• Supporting different locale regions using Rails i18n

  - by Olly

  I'm using the standard Rails I18n API to localise some of our views. This is working really well, but we now have a few use cases for regional changes to the en locale. The API guide mentions that this isn't supported directly, and other plugins should be used. However, I'm wondering whether there's a simpler way to do this. I already have en.yml, so in theory I could just create en-AU.yml and en-US.yml which are effectively clones of en.yml but with a few regional changes applied. I could then add additional English - American and English - Australian options to our configuration which would map to the new region-specific locales and allow users to use a region-specific locale. The only problem I can think of with this is that it isn't DRY -- I would have duplicate translations for all common English words. I can't see a way around this. Are there any other disadvantages to this approach, or should I just bite the bullet and dive into one of the plug-ins such as Globalize2 instead?

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• Regex Pattern for ignoring a custom escape character

  - by user1517464

  I am trying to find a suitable regex for matching pair of custom characters in an input string. These custom characters are replaced by their corresponding html tags. For e.g. The input string can have underscores in pairs to indicate words in bold. Hence, _Name_ outputs as <b>Name</b> However if there is a genuine underscore in the string, it cannot be replaced by "bold" tags and has to be ignored. The genuine underscore has to be preceded by / (I couldn't find a better character, it could be one more underscore or hyphen or whatever). Any single or paired occurrance of this genuine underscore has to be ignored by regex. So far I could come up with this regex: var pattern = @"(?!/)_(.*?)(?!/)_"; But it fails in below input string: _Tom_Katy/_Richard/_/_Stephan_and many users It outputs as <b>Tom</b>Katy/<b>Richard/_/</b>Stephan_and many users Many Thanks in Advance, Pr

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• changing Python code in the debugger

  - by max

  Is there any debugger that allows Python code to be changed while debugging? In other words: run-time exception occurs, debugger stops, I change the code any way I like, and tell the program to continue. I am aware of the problems with this approach, such that references to functions would still point to the old definitions if I redefine the function on the fly, and so on. I am ok with that, since I just want to be able to make small fixes in very simple circumstances. On the other hand, I'm also interested in whether it's theoretically possible to allow changes to Python code without running into these problems: i.e., somehow update all the references to the objects that changed, etc. I'm nearly sure the answer to the second question is no, but if I'm wrong, I'd like to know. EDIT: If my goal (changing the code interactively when an exception occurred, and then continuing execution), is achievable without a debugger - that would be good as well. I don't need to use the debugger.

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• Install a file which should be removed only on real uninstall and never overwritten

  - by Viv Coco

  When I install my application, along with the binaries, a conf file is installed that the user can change as he needs (it's actually the user data file). I would like this file to not be overwritten or deleted when a repair, upgrade, modify happens and it should be deleted only when a real uninstall happens. In other words: this conf file is installed along with the binaries and should never be touched again (overwritten/deleted) until a real uninstall happens (not repairs, modifies, upgrades) in which case it should be deleted. So I was thinking of doing: <Component Id="aaa.cfg" Guid="GUID"> <File Id="aaa.cfg" Source="aaa.cfg" KeyPath="yes" /> </Component> But I don't know how could I condition the component so that: 1) the component to be removed only on a real uninstall - not upgrades, repairs, modifies? 2) the file should in no case be overwritten if already exists. Thx, Viv

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• Assembly installed into the GAC not showing up in Visual Studio

  - by yodaj007

  This sounds related to this question, but they aren't the same thing. That question had no assemblies showing up. Mine has everything except the specific one I installed. I'm hoping someone has a solution to this... am I doing something wrong? Or did I find some bug in VS? I am using Visual Studio 2010 Professional Beta 2 on Windows 7 Ultimate. I just downloaded Rhino Mocks and decided to install it into the GAC using the command-line utility GACUTIL. I then rebooted. Here you can see the assembly in my GAC (click to enlarge): And here is the list of assemblies available to me in Visual Studio: Here is the command prompt where I installed it, and then confirmed it: C:\Users\jason\Downloads>gacutil -i Rhino.Mocks.dll Microsoft (R) .NET Global Assembly Cache Utility. Version 4.0.21006.1 Copyright (c) Microsoft Corporation. All rights reserved. Assembly successfully added to the cache C:\Users\jason\Downloads>gacutil /l |grep -i rhino Rhino.Mocks, Version=3.6.0.0, Culture=neutral, PublicKeyToken=0b3305902db7183f, processorArchitecture=MSIL

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• Verifying the purchaser of an App Store application

  - by Keldi

  Is there a way for the developer of an App Store application to tie a sale to an individual user/device ID/Apple account? In other words, a method for the developer to double-check that a specific user has legally purchased the software? I haven't been able to find a reliable answer to this yet. I'm not looking for specific code examples, just some sort of idea as to how possible (or difficult) this is. My intent isn't to penalize piracy; it's to be able to provide additional benefits to paid customers. As such, I'm not looking for a way to identify a cracked or pirated version, which I gather has already been solved. Thanks in advance for any help you can provide!

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• http(/* argument here */) How is this Object (Http) being used without an explicit or implicit meth

  - by Randin

  In the example for coding with Json using Databinder Dispatch Nathan uses an Object (Http) without a method, shown here: import dispatch._ import Http._ Http("http://www.fox.com/dollhouse/" >>> System.out ) How is he doing this? Thank you for all of the answers unfortunatly I was not specific enough... It looks like it is simply passing an argument to a constructor of class or companion object Http. In another example, I've seen another form: http = new Http http(/* argument here */) Is this valid Scala? I guess it must be, because the author is a Scala expert. But it makes no sense to me. Actions are usually performed by invoking methods on objects, whether explicitly as object.doSomething() or implicitly as object = something (using the apply() method underneath the syntactic sugar). All I can think of is that a constructor is being used to do something in addition to constructing an object. In other words, it is having side effects, such as in this case going off and doing something on the web.

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• read file in C++

  - by Amm Sokun

  I am trying to read a list of words from a file in C++. However, the last word is read twice. I cannot understand why it is so. Can someone help me out? int main () { ifstream fin, finn; vector<string> vin; vector<string> typo; string word; fin.open("F:\\coursework\\pz\\gattaca\\breathanalyzer\\file.in"); if (!fin.is_open()) cout<<"Not open\n"; while (fin) { fin >> word; cout<<word<<endl; vin.push_back(word); } fin.close(); }

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• Converting a Doc object into a string in python

  - by Sam

  I'm using minidom to parse through an xml document. I took the data with yum tags and stored them in a list and calculated the frequency of the words. However, its not storing or reading them as strings in the list. Is there another way to do it? Right now this is what I have: yumNodes = [node for node in doc.getElementsByTagName("yum")] for node in yumNodes: yumlist.append(t.data for t in node.childNodes if t.nodeType == t.TEXT_NODE) for ob in yumlist: for o in ob: if word not in freqDict: freqDict[word] = 1 else: freqDict[word] += 1

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• ASP.net MVC - Check status request

  - by vdhant

  Hi guys Just wondering if its possible to get the status of a request from another request? To help provide some context, I want to use ajax to upload some files to the server. When the upload is started I want triggered another ajax request that checks to see how much of the file has been uploaded (or in other words how big was the other request and how far through receiving the request is the server). I was thinking that I could use a guid or something similar to ensure that I am checking the status of the right request. But how do I check the status of another request??? Cheers Anthony

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• What to name a method

  - by coffeeaddict

  I'm debating what to name this method. CloseCashTransaction(Cash.Id, -1, true); or CompleteCyberCashTransaction(Cash.Id, -1, true); or neither are good? In business terms/process by sending in these 3 values I'm essentially "closing the transaction" or "completing the transaction" in our workflow. However on the developer side, I cant' infer wtf "Complete" or "Close" means. It forces me to look into the internals of the method. My struggle is that I try to name methods to infer what they are doing. Complete is just way too general and forces the consumer of the method to dive into the code every time I use words like this. When I see stuff like this all over code, I have to take so much time to figure out what they are actually doing. And if the comments suck, I end up having to look at all logic in that method because the comments nor the method name really infer what's going on.

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• Linq-to-SQL produces bad SQL?

  - by strager

  I am trying to run a Linq-to-SQL query, but when the query is evaluated, I get the following exception: System.Data.OleDb.OleDbException was unhandled Message=The SELECT statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect. Source=Microsoft JET Database Engine ErrorCode=-2147217900 StackTrace: at System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr) at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.OleDb.OleDbCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.ExecuteReader() at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression) at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source) at xxx.InventoryPopulator`2.Clear(String barcode) in F:\Projects\C#\xxx\xxx\InventoryPopulator.cs:line 38 [..etc..] InnerException: The debugger shows my query is: SELECT [t0].[SupplierID] AS [Id], [t0].[SupplierSKU] AS [Sku], [t0].[LocalSKU] AS [LocalSku], [t0].[ManufacturersBarcode] AS [Barcode], [t0].[QuantityAvailable] FROM [inventorySupplier] AS [t0] WHERE [t0].[ManufacturersBarcode] = @p0 And the Linq query which generates the above is: var items = from item in this.supplierItems where item.Barcode == barcode select item; How do I fix my query?

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• Altering CSS for nav bar images to accomodate IE

  - by Kim

  My horizontal nav bar is populated with images for the links that are coming from one image that includes all the sub-images; each nav item image is identified by the pixel location within the larger image. This works perfectly fine in Firefox and Safari, but in IE, all of the images are misplaced too low within the nav bar (can only barely see the tops of the words). Two questions: How do I fix this in the css so it is back-compatible with the more recent versions (and current versions) of IE Do I need a separate IE stylesheet? Thanks!

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• OutOfMemoryException

  - by Andrew

  I have an application that is pretty memory hungry. It holds a large amount of data in some big arrays. I have recently been noticing the occasional OutOfMemoryException. These OutOfMemoryExceptions are occurring long before my application (ASP.Net) has used up the 800mb available to it. I have track the issue down to the area of code where the array is resized. The array contains a structure that is 74bytes in size. (I know that you shouldn't create struct's that are bigger than 16bytes), but this application is a port from a Vb6 application). I have tried changing the struct to a class and this appears to have fixed the problem for now. I think the reason that changing to a class solves the problem has to do with the fact that when using a struct and the array is resized, a segment of memory that is large enough to store the new array needs to be reserved (e.g. (currentArraySize + increaseBySize)*74) cannot be found. This leads to the OutOfMemoryException. This isn't the case with a class as each element of the array only needs 8bytes to store a pointer to the new object. Is my thinking correct here?

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• Spring WS & Validator interceptor

  - by mada

  I have a endpoint mapping a webservice which is used to insert in the dabatabase some keywords: @Transactional(readOnly = false,isolation= Isolation.SERIALIZABLE) public Source saveKW(...). The input is a request. I would like to add an interceptor on the method in order to validate the parameters. this one will read some values from the DB. i would like that this interceptor is EMBED in the transaction declared for the endpoint (or this opposite). In other words, i want them to be in the same transaction. Ideally im looking for something like this with annotation: @Transactional(readOnly = false,isolation= Isolation.SERIALIZABLE) @validator("KeyWordValidaor.class") public Source saveKW(...) where KeyWordValidaor will be class validating the parameters. Have you any idea or short examples to implements this like this way or in a other real way?

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• Check For Duplicate Records VS try/catch Unique Key Constraint

  - by Jed

  I have a database table that has a Unique Key constraint defined to avoid duplicate records from occurring. I'm curious if it is bad practice to NOT manually check for duplicate records prior to running an INSERT statement on the table. In other words, should I run a SELECT statement using a WHERE clause that checks for duplicate values of the record that I am about to INSERT. If a record is found, then do not run the INSERT statement, otherwise go ahead and run the INSERT.... OR Just run the INSERT statement and try/catch the exception that may be thrown due to a Unique Key violation. I'm weighing the two perspectives and can't decide which is best- 1. Don't waste a SELECT call to check for duplicates when I can just trap for an exception VS 2. Don't be lazy by implementing ugly try/catch logic VS 3. ???Your thoughts here??? :)

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• Java Scripting Engine importing my classes does not work

  - by Ayman

  A code is worth 1000 words of explaining it :-) package jasim; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class JSTest { public static void main(String[] args) throws ScriptException { ScriptEngine jse = new ScriptEngineManager().getEngineByExtension("js"); jse.eval("println(new jasim.JSTest().toString)"); } @Override public String toString() { return "JSTest Object"; } } This code will fail with the below exception: Exception in thread "main" javax.script.ScriptException: sun.org.mozilla.javascript.internal.EcmaError: ReferenceError: "jasim" is not defined. (<Unknown source>#1) in <Unknown source> at line number 1 How do I import my own classes into the ScriptEngine?

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• Kohana3: Absolute path to a file

  - by Svish

  Say I have a file in my kohana 3 website called assets/somefile.jpg. I can get the url to that file by doing echo Url::site('assets/somefile.jpg'); // /kohana/assets/somefile.jpg Is there a way I can get the absolute path to that file? Like if I want to fopen it or get the size of the file or something like that. In other words, I would like to get something like /var/www/kohana/assets/somefile.jpg or W:\www\kohana\assets\somefile.jpg or whatever is the absolute path.

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• UITextField with the lookup

  - by leon

  Hello, I would like to achive the same functinoanlity in the UUTextField control as Google search web site (which uses Ajax for this): as user start typing, list of suggestion searches is shown. Then more letteres you type, suggestion list changes. So imaging I have array of words: Apple Abc Aman As user types A, all thress suggesions are shown, if user type one more letter p, then Apple is suggested. How would I do something like this? Mail type of applicatins do it, when receipent name is typed in the To: edit control I guess I can use UITableView with the search, is it correct approach?

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• I have a problem sometimes in my vb.net webmail application?

  - by ahmed

  I have a weird problem in my vb.net web application sometimes. webmail webform with html editor, sometimes very rare users type for example more than 200 or 400 characters and send the message to other user. But the reciever only recieves 5 or 7 characters. 2 or 3 words of the message. I don know what is going on. I checked the code, no bugs everything is working fine.All the users are on Microsoft XPsp2 platform. Any help will be appreciated. Is this sufficient , or shall I provide any more input regarding the problem...?? OK I got it... the problem is when I type characters in HtmlEditor it keeps on continuing, i mean it should go to the end and automatically comes to the second line....but it is going on and on.how can I stop this.

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