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• Which design pattern should I be using?

  - by Gabriel

  Here's briefly what I'm trying to do. The user supplies me with a link to a photo from one of several photo-sharing websites (such as Flickr, Zooomr, et. al). I then do some processing on the photo using their respective APIs. Right now, I'm only implementing one service, but I will most likely add more in the near future. I don't want to have a bunch of if/else or switch statements to define the logic for the different websites (but maybe that's necessary?) I'd rather just call GetImage(url) and have it get me the image from whatever service the url's domain is from. I'm confused how the GetImage function and classes should be designed. Maybe I need the strategy pattern? I'm still reading and trying to understand the various design patterns and how I could make one fit in this case. I'm doing this in C#, but this question is language-agnostic.

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• Prototype to JQuery - how to access originator of event

  - by ciaranarcher

  Hi there I'm coming from a Prototype background and looking into JQuery. I'd like to know the 'right' way to do attach a click event to a bunch of elements, but then know in the event handler which one of my elements was clicked. I've come up with the following: MYNS.CarouselHelper.prototype.attachImgHandlers = function () { $j(".carouselItem").bind("click", this, function(e){ e.data.openCarouselImage(e) }); } I then have the following in my event handler: MYNS.CarouselHelper.prototype.openCarouselImage = function(e) { var img = e.currentTarget; // Do stuff to the image element }; Is this 'right'? It feels wrong to me as I am used to explicitly passing the element to the event handler in Prototype as I loop through an array of elements. Thanks in advance.

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• Debugging ASP.NET on a built-in web server suddenly stops

  - by Anton Gogolev

  I have Windows Server 2008 (64-bit), VS 2008 with its built-in webserver and an ASP.NET MVC 1.0 webapp. All I'm trying to do is to debug said app. I have a bunch of breakpoints, but they behave in a very strange way. When I fist start a debugging session with F5 and hit a breakpoint, the debugger stops just fine. However, after serveral F10s/F11s debugging suddenly "stops" (no exceptions at that time), but neither VS detaches from browsers' process, nor webapp execution stops: Visual Studio stays attached, and web request continues executing as usual. I tried various browsers (Chrome, Firefox, IE), but to no avail. What do I do to solve this? It really drives me insane.

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• Clone DB table row through MVC in SQL Server

  - by sslepian

  Is there a simple solution for duplicating table rows in SQL Server as well as all table rows with foreign keys pointing to the cloned table row? I've got a "master" table and a bunch of "child" tables which have a foreign key into the ID of the master table. I need to not only create a perfect copy of the master table, but clone each and every child table referencing the master table. Is there a simpler way to do this than creating a new row in the master table, copying in the information from the row to be cloned, then going through each child table and doing the same with each row pointing to the cloned row in the master table? I'm using a SQL Server 2005 Database accessed through C# ASP.net MVC 1.0.

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• How can I set up jnlp for use with Sinatra?

  - by mmr

  I have a website currently running Sinatra and a bunch of other technologies. I wanted to get progress bars running, but that's been a no go. So, a friend of mine whipped up a quick upload in Java, and I'm running that through scponly (chrooted) to make sure they can't do anything funny with changing directories and suchlike. But how can I start the jnlp file from Sinatra? Is it as simply as making it a link and then letting it be downloaded by the user? This code suggests otherwise, but there are a lot of things in there I don't understand (probably because I'm not reading it in the context of the larger program there).

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• How to filter results by multiple fields?

  - by hadees

  I am working on a survey application in ruby on rails and on the results page I want to let users filter the answers by a bunch of demographic questions I asked at the start of the survey. For example I asked users what their gender and career was. So I was thinking of having dropdowns for gender and career. Both dropdowns would default to all but if a user selected female and marketer then my results page would so only answers from female marketers. I think the right way of doing this is to use named_scopes where I have a named_scope for every one of my demographic questions, in this example gender and career, which would take in a sanitized value from the dropdown to use at the conditional but i'm unsure on how to dynamically create the named_scope chain since I have like 5 demographic questions and presumably some of them are going to be set to all.

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• DLL/TLB in Java<->DCOM communication

  - by beermann

  I have to write an OpenOffice add-on (in Java) which communicates with DCOM server of some closed-source application. The major problem is that, I don't have any documentation about server's Interfaces . All I have is a VB/C++ SDK kit for the Application. SDK contain a library in dll and a bunch of *.tlb files. In SDK documentation there is an information, I can use java, but there is no example at all. I have read provided examples and it looks like all the communication wit DCOM goes through this dll. Is there a way to somehow import such dll/tlb functions def directly to java, bypass dll and comunicate with DCOM or I have to write a C++ wrapper(dll)? What is the best way to do it? Any hints are welcomed.

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• Dynamic "OR" conditions in Rails 3

  - by Ryan Foster

  I am working on a carpool application where people can search for lifts. They should be able to select the city from which they would liked to be picked up and choose a radius which will then add the cities in range to the query. However the way it is so far is that i can only chain a bunch of "AND" conditions together where it would be right to say "WHERE start_city = city_from OR start_city = a_city_in_range OR start_city = another_city_in_range" Does anyone know how to achive this? Thanks very much in advance. class Search < ActiveRecord::Base def find_lifts scope = Lift.where('city_from_id = ?', self.city_from) #returns id of cities which are in range of given radius @cities_in_range_from = City.location_ids_in_range(self.city_from, self.radius_from) #adds where condition based on cities in range for city in @cities_in_range_from scope = scope.where('city_from_id = ?', city) #something like scope.or('city_from_id = ?', city) would be nice.. end end

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• I Clean Solution'd my Winform App and now it's broken...

  - by Refracted Paladin

  I have a Winform App that uses a 3rd Party Library of Controls, DevExpress. I also created a bunch of Controls myself, extending those controls. Everything has been working fine when all of a sudden I opened VS today and on the Design Page all my extended controls were missing. I then tried rebuilding to no avail. Then I tried Cleaning and Rebuilding and made it even worse. Now I have tons(520) of erros stating things like -- Error 179 The name 'datBirthDate' does not exist in the current context D:\Documents\Visual Studio 2008\Projects\MatrixReloaded\MatrixReloaded\Controls\Member\ucGeneral.cs 339 17 MatrixReloaded also if I try to open a form or user control in Design Mode I first get this -- could not find type, "MyType" please make sure that the assembly that contains this type is referenced and then, if I click Ignore and Continue I get this for all Forms and Contros when I try and look at them in Design Mode -- Exception of type System.OutOfMemoryException was thrown Help!?!? When I googled I came across mostly references to VS 2003...I am on 2008 sp1.

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• No events are fired from an imagebrush via ImageOpened/ImageFailed

  - by umlgorithm

  A canvas is received from the server, and an image brush is extracted from the canvas via searching for a bunch of pathes. In summary, Canvas - Path - Path.Fill - ImageBrush. Now, I want to take a snapshot of the ImageBrush using WriteableBitmap when it is loaded and here is what I did var imageBrushes = VisualTreeUtility.FindVisualChildren<Path>(canvas) .Where(i => i.Fill.GetType() == typeof(ImageBrush)) .Select(p => p.Fill); foreach(var image in imageBrushes) { image.ImageOpened += delegate { //never gets here }; image.ImageFailed += delegate { //never gets here either }; // if the image is already loaded if (((BitmapSource)image.ImageSource).PixelWidth != 0) { // never gets here either } } As you can see the comments in the code above, no matter what I try, I can't seem to catch an event from the image. Any suggestions?

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• Utilising cssText to set styles with JavaScript

  - by Rajat

  I was going through Nicholas Zakas presentation on JavaScript here : http://www.slideshare.net/nzakas/writing-efficient-javascript (slide number: 89/139) He recommends using cssText property whenever you are setting a bunch of styles through JavaScript. The best solution is obviously adding those styles to a class and then using JS to add the classname to an element.However, in many situations, We resort to just setting the properties directly within JS when the number of properties are low. It seems from his presentation that using cssText property would be more efficient in such scenarios.I tried to look up more on the property but couldn't find much information. Has anyone used the 'cssText' property ? It would be great to have some more technical info on how the property helps.

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• Should I be building GUI applications on Windows using Perl & Tk?

  - by CheeseConQueso

  I have a bunch of related Perl scripts that I would like to put together in one convenient place. So I was thinking of building a GUI and incorporating the scripts. I'm using Strawberry Perl on Windows XP and have just installed Tk from cpan about fifteen minutes ago. Before I go for it, I want some sound advice either for or against it. My other option is to translate the Perl scripts into VB and use Visual Studio 2008, but that might be too much hassle for an outcome that might end up all the same had I just stuck with Perl & Tk. I haven't looked yet, but maybe there is a module for Visual Studio that would allow me to invoke Perl scripts? The main requirements are: It must be able to communicate with MySQL It must be able to fetch & parse XML files from the internet It must be transportable, scalable, and sustainable What direction would you take?

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• How to do a range query

  - by Walter H

  I have a bunch of numbers timestamps that I want to check against a range to see if they match a particular range of dates. Basically like a BETWEEN .. AND .. match in SQL. The obvious data structure would be a B-tree, but while there are a number of B-tree implementations on CPAN, they only seem to implement exact matching. Berkeley DB has the same problem; there are B-tree indices, but no range matching. What would be the simplest way to do this? I don't want to use an SQL database unless I have to. Clarification: I have a lot of these, so I'm looking for an efficient method, not just grep over an array.

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• IIS7 301 Redirect from a List of URLs

  - by corymathews

  Recent changes are forcing me to add a bunch of 301 redirects. Seems that IIS7 is my best bet as compared to redirects within the files. I have found how to add them 1 by 1 but this requires the page/folder to exist (which most don't anymore(and creating them seems to defeat the point of the redirect)) and does not work on dynamic urls. I also cannot go to every page and add the redirects at the page level because some older pages are in php which is no longer supported on the new server. There is also no obvious pattern to the changes so each one must be made on its own. samples of the redirects page.htm - /page/ /folder/folder/ - /folder/folder.cfm /folder/folder/ - /folder/ /page.php?id=1 - page.htm

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• Django multiple generic_inline_formset in a view

  - by Can Burak Cilingir

  We have a bunch of formsets: EmailAddressInlineFormSet = generic_inlineformset_factory( EmailAddress, extra=1, exclude=["created_by","last_modified_by"]) emailaddressformset = EmailAddressInlineFormSet( instance=person, prefix="emailaddress") # [ more definitions ] and, in the view, we process them as: emailaddressformset = EmailAddressInlineFormSet( request.POST, instance=person, prefix="emailaddress") # [ more definitions ] So, nothing fancy or unordinary. The unfortunate or unordinary fact is, we have 15 of these formsets, one for email addresses, other for phone numbers etc. so the view code is ugly and not-so-manageable. What would be the most unhackish way to handle this number of formsets in a single view? At the end -i guess- I'm looking for a class or a functionality like multiple_generic_inline_formset and open to all kind of suggestions or discussions.

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• How to use pom.xml/Maven to initialize a local thoughtsite (App Engine sample) project in Eclipse?

  - by ovr

  This sample app ("thoughtsite") for App Engine contains a pom.xml in its trunk: http://code.google.com/p/thoughtsite/source/browse/#svn/trunk But I don't know what command to run in Maven to set up the project locally. (The README doesn't mention anything about Maven.) I tried to just import the project code directly into Eclipse but it doesn't look like it's in an appropriate format for a direct import. So I assume I need to do something with Maven to get it set up correctly. I haven't really used Maven before so I'm not sure what command I would need to run to set everything up. The pom.xml seems like it downloads a bunch of dependencies for the project like the Spring jar files which I don't see anywhere else in the svn repository.

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• gwt typeahead missing

  - by arinte

  I have a GWT app with a bunch of textboxes. In firefox I would expect that when I type a word in a textbox that I have already typed in and submitted, that firefox would offer to autocomplete that text. But for this GWT app it is not happening. Also in IE it seems that none of my css stuff is loaded. And when I IE developer tools on my GWT page, it can focus in on any of the textboxes it just focuses on the encompassing DIV around all the textboxes.

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• How to configure git repository so a branch other than master is checked out after a cloning?

  - by Suraj Barkale

  I am trying to set up a git server with bunch of repositories. I am planning to use the branching model described in http://nvie.com/git-model article. So I will have at least two branches (named master and develop) in the repository. After a clone the master branch is checked out by git. Is there a git config option so that develop branch will be checked out instead? In effect I want git clone my_repo_url to behave as git clone -b develop my_repo_url.

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• How to click through JGlassPane With MouseListener to UI behind it

  - by Epicmaster

  I have a JFrame and a bunch of JComponents on top of the JFrame. I need to make use of the JGlassPane and I used this implementation to set it up. JPanel glass = new JPanel(); frame.setGlassPane(glass); glass.setVisible(true); glass.setOpaque(false); After doing so I can't select any JButtons or other JComponents under the JGlassPane. Is there a way to have only the components on the GlassPane selectable while still having the ability to select components under the GlassPane? Edit I forgot to mention (not knowing this would be relevant) that I did attach both a MouseListener and a MouseMotionListener to the glass pane. Is there a way to pass the Mouse Events to other components and only use them when needed?

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• Android: Deciding between SurfaceView and OpenGL (GLSurfaceView)

  - by Rich

  Is there a way to decide up front based on the expected complexity of a game/app in the planning phase whether to use regular Canvas drawing in a SurfaceView or to go with OpenGL? I've been playing around with a Canvas and only need 2D movement, and on a fairly new phone I'm getting pretty decent performance with a bunch of primitive objects and a few bitmaps running around the screen on a solid background. Is it fair to say that if I'm going to be drawing background images and increasing the number of objects being moved and drawn on top of them that I should go straight to OpenGL?

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• What is .htaccess RewriteRule best practice?

  - by Pablo

  Is it better to have a single RewriteRule with a bunch of RegEx or multiples Rules with fewer RegEx for the server to query? Will there be any performance differences? Heres is an example a single rule with almost all RegEx groups as optional: RewriteRule ^gallery/?([\w]+)?/?([\w]+)?/?([\d]+)?/?([\w]+)/?$ /gallery.php?$1=$2&start=$3&by=$4 [NC] Here are some of the rules lists that would replace the one above: RewriteRule ^gallery/category/([\w]+)/$ /gallery.php?category=$1& [NC] RewriteRule ^gallery/category/([\w]+)/([\d]+)/$ /gallery.php?category=$1&start=$2 [NC] RewriteRule ^gallery/category/([\w]+)/([\d]+)/([\w]+)/$ /gallery.php?category=$1&start=$2&by=$3 [NC] ... RewriteRule ^gallery/tag/([\w]+)/$ /gallery.php?category=$1& [NC] RewriteRule ^gallery/tag/([\w]+)/([\d]+)/$ /gallery.php?category=$1&start=$2 [NC] RewriteRule ^gallery/tag/([\w]+)/([\d]+)/([\w]+)/$ /gallery.php?category=$1&start=$2&by=$3 [NC] ... I'll be glad to hear your options or personal experiences.

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• Lua class instance with nested tables

  - by Anonnobody

  Hello, Simple lua game with simple class like so: creature = class({ name = "MONSTER BADDY!", stats = { power = 10, agility = 10, endurance = 10, filters = {} }, other_things = ... }) creatureA = creature.new() creatureB = creature.new() creatureA.name = "Frank" creatureB.name = "Zappa" creatureA.stats.agility = 20 creatureB.stats.power = 12 -- blah blah blah Non table values are individual to each instance, but table values are shared among all instances and if I modify a stats.X value in one instance, all other instances see the same stats table. Q1: Is my OO implementation flawed? I tried LOOP and the same result occured, is there a fundamental flaw in my logic? Q2: How would you have each instance of creature have it's own stats table (and sub tables)? PS. I cannot flatten my class table as it's a bit more complicated than the example and other parts of the code are simplified with this nested table implementation. Thanks a bunch.

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• CSS line wrapping

  - by Mic

  Given a block container <div> this is a very long string which contains a bunch of characters that I want to break at container edges. </div> are there any css properties I can set to force it to break when it reaches the container width, regardless of the contents of the string, for example a break like: this is a ve ry long stri ng which ... is pretty much what I want. Right now, it seems to always prefer to break at whitespace characters or other special characters (such as /).

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• Tricking the server to load files faster?

  - by Yongho

  If we have a website with multiple images and videos, I've read that it's best to serve them from other domains so that the browser can simultaneously download a bunch of files, rather than waiting one by one for each file to be downloaded. For example, if we have a website http://example.com/, we might consider serving: Videos from http://video.example.com/ Images from http://images.example.com/ etc. Question: can we achieve the simultaneous downloading by tricking the browser into believing that the files are hosted there, or do they actually need to be at that location? We can, for example, pretend to serve video from http://video.example.com/ when actually it's just a clever htaccess rewrite that ACTUALLY serves from http://example.com/video.php. In this case, the video is being served from the main domain but because we refer it as http://video.example.com/, it may think that it's another domain and thus load files simultaneously, rather than one by one. Is this feasible?

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• When to use or not use symbols in PHP

  - by brett

  I'm reading a PHP book where the author says that symbols should be avoided except when it's valid to use them. Very informative stuff, if he could only elaborate or give code examples but he doesn't. Can someone from the experienced PHP bunch give me an example of what these symbols are, and when it makes sense to use them or not. I'm looking for a code example that I can wrap my head around since I don't quite get it in plain English. Code is more plain English to me.

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