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• RoR - Paperclip - How to set minimal width of an attachement

  - by sNiCKY

  Hi, my layout's requirement is to keep all thumbnails at 80px height, not higher, not smaller. In my model I set the style to :thumb= "500x80", so basically almost every picture which is not too wide gets its perfect miniature with 80px height. Sometimes, however, my pictures are narrow and high, so the thumb can have unclickable dimensions of like 5x80. So I dont want to crop pictures as long as thumbnails are not getting crazy narrow, but I think I can make a little sacrifice and crop them if thumb's width is getting smaller than 25px. So my questions is - is it possible in paperclip to set minimal proportions of a picture by which the style will be "500x80" and beyond that it will turn to sth like "25x80#"?

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• Creating my own bundle in xCode, for iPhone application

  - by sagar

  Hello everyone! I am having some difficulty creating a bundle for my application, and placing files in the bundle. For example, FaceBook has developed a bundle for iPhone applications using their framework. In the same way, I also want to create a bundle which can be reused for many applications. My questions are: what steps should I follow to create a bundle for any kind of application? what should be taken care while creating a bundle? Thanks in advance for sharing your knowledge.

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• C# Socket Server

  - by Snoopy

  In .NET 3.5 a new socket classes was released: http://msdn.microsoft.com/en-us/library/bb968780.aspx i found a sample but some questions regarding best practicses are remaining: http://code.msdn.microsoft.com/nclsamples/Wiki/View.aspx?title=Socket%20Performance m_numConnections (the maximum number of connections the sample is designed to handle simultaneously) is probably equal to the amount of cpu cores i have. m_receiveBufferSize is the size for one packet? like 8kb? how should i handle a length byte? opsToPreAlloc i dont understand. is this if i code a transparent proxy? Regarding the multithreading, what should be used? The reactive extension seem to be a good choice. Has anyone tried this in a real world project? Are there better options? I had bad experiences with the .NET thread pool in the past.

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• rails: date type and GetDate

  - by cbrulak

  This is a follow up to this question: http://stackoverflow.com/questions/2930256/unique-responses-rails-gem I'm going to create an index based on the user id, url and a date type. I want date type (not datetime type) because I want the day, the 24 hour day to be part of the index to avoid duplication of page views counts on the same day. In other words: A view only counts once in a day by a visitor. I also want the default value of that column (viewdate) to be the function GETDATE(). This is what I have in my migration: execute "ALTER TABLEpage_viewsADD COLUMN viewdate datetime DEFAULTGETDATE()`" But the value viewdate is always empty. What am I missing? (as an aside, any other suggestions for accomplishing this goal?)

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• Rectangular BackColor of selection in RichTextBox

  - by AgentConundrum

  Background: I'm going to start studying/coding at the local university's library. Since I'm not a student, I won't be able to utilize their wireless internet access. Since StackOverflow is such a great resource, I want to be able to take it with me, so I'm building a small desktop application to load/search/display the most recent data dumps. Problem: I want to display code blocks in the same sort of rectangular block as this site does, so I played with the RichTextBox control to try to create this effect. Unfortunately, the RichTextBox.SelectedBackColor property only colors the actual text, when what I want is a rectangle reaching to the outer limits of the selection. Example: This is what I am able to produce with the RichTextBox: This is what I would like to create: Questions: Is there any way to produce this effect using the RichTextBox? If not, are there any other controls I could use to create this effect?

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• Customizing the behavior of ControlDesigners for Controls derived from native .NET controls.

  - by Eric

  My question is related to this question: http://stackoverflow.com/questions/93541/baseline-snaplines-in-custom-winforms-controls However, in my case, I have created a new control that derives from TextBox rather than containing a TextBox. I would like to have a custom ControlDesigner, but I would like to modify the behavior of the TextBox's designer rather than having to write a complete designer myself. In particular, I'd like to be able to return the TextBox's SnapLines while providing some custom verbs. Is there a good way to do this? EDIT: To clarify, this is for Windows Forms in .NET 2.0.

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• How to find an available port?

  - by Roman

  I want to start a server which listen to a port. I can specify port explicitly and it works. But I would like to find a port in an automatic way. In this respect I have two questions. In which range of port numbers should I search for? (I used ports 12345, 12346, and 12347 and it was fine). How can I find out if a given port is not occupied by another software?

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• How to make iPhone application accept incorrect server certificate but only specific one?

  - by Igor Romanov

  I need to work with private HTTPS API and client has incorrect certificate on the host. Certificate is for www.clienthost.com and I'm working with api.clienthost.com. So I need to connect via HTTPS to api.clienthost.com ignoring incorrect certificate but still make sure it is the one for www.clienthost.com and not something else. I found this answer: http://stackoverflow.com/questions/933331/how-to-use-nsurlconnection-to-connect-with-ssl-for-an-untrusted-cert and it seems to solve half of my problem but I'm trying to figure out how to still check certificate for host is one I expect to see and not different.

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• Telling someone to "let the world judge their development practices" without being condicending?

  - by leeand00

  There's a person in management on my team, that: Doesn't ask questions on Stack Overflow. Doesn't read development blogs. Doesn't use development best practices. This person is about to make some major decisions about the technology stack that will be used throughout the company. (I asked him what the technology stack was they were planning to use was, and it included many things that are not even development tools). How can I tell them to "Let the world's experience" judge their development practices, before they set them in stone; without being condescending or upsetting them?

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• Javascript does not work on IIS

  - by Cat Mitch

  I have a .NET library executing as part of our website that renders HTML to image formats. It uses the IE rendering engine, and will happily run any javascript if present to do the rendering. The problem is we just moved the code to a new server, and javascript seems to be disabled. I tried changing (briefly the Application Pools Process Model Identity from NetworkService to LocalSystem, and that worked fine. Hence it must be a permissions problem. So my questions are this: 1) What is the specific permission I need to set to allow the IE rendering engine to execute javascript, inside the IIS application pool? 2) What is the best way to enable that in my application pool? Do I just somehow set it in NetworkService, or create a new identify (how is that done?) Thanks!

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• Creating an interactive website

  - by Aviran

  I want to create an interactive website using aspx and ajax, that there will be an option to create chess game room for example and other players will be able to join. I have 2 Questions: I wonder if you have any idea how can I make that after one player clicks on a button and finish his turn, the other player will be able to do a move. After the first player finish his turn I will change the turn by using the database, but the point is how can I refresh the other player's site so when the other one finish his turn, the turn will come to the second player? When someone creates a room and than close his browser - I need that room to be closed. Shall I use the Session_OnEnd to close the room he opened? Thanks!

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• TreeNodes don't get collected with weakevent solution

  - by Marcus

  Hi, When I use this method http://stackoverflow.com/questions/1089309/weak-events-in-net (by Egor) to hook up a event i a inherited treenode, the tree node never gets collected, is there any speciall case with tree nodes and GC? public class MyTreeNode : TreeNode { public MyTreeNode(Entity entity) { entity.Children.ListChanged += new ListChangedEventHandler(entityChildren_ListChanged).MakeWeak(eh => entity.Children.ListChanged -= eh); } } Entity.Children is a bindinglist. I made tests with a destructor on MyTreeNode and invoking GC.Collect(), with the weak eventhandler the treenode never gets collected but i DOES get collected WIHTOUT the weak eventhandler.

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• How to read information from .3gp and .mp4 using ffmpeg-php?

  - by Neltharian

  I have a bit of a problem with ffmpeg-php. I'm trying to get some information from video files and it works pretty fine with file formats like .avi, .mpg or .flv but when I try to use .3gp or .mp4 in: $movie = new ffmpeg_movie('path/to/file/test.3gp'); I get error like this : ffmpeg_movie::__construct() []: ISO: File Type Major Brand: 3gp5 or ffmpeg_movie::__construct() []: ISO: File Type Major Brand: mp42 I installed ffmpeg-php on WAMP using instructions found here: http://stackoverflow.com/questions/1172916/how-to-install-ffmpeg-in-wampserver-2-0-windows-xp I need those information to send them to ffmpeg using exec(). Anyone could help me with this?

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• Use SQL to filter the results of a stored procedure

  - by Ben McCormack

  I've looked at other questions on Stack Overflow related to this question, but none of them seemed to answer this question clearly. We have a system Stored Procedure called sp_who2 which returns a result set of information for all running processes on the server. I want to filter the data returned by the stored procedure; conceptually, I might do it like so: SELECT * FROM sp_who2 WHERE login='bmccormack' That method, though, doesn't work. What are good practices for achieving the goal of querying the returned data of a stored procedure, preferably without having to look of the code of the original stored procedure and modify it.

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• SelfReferenceProperty vs. ListProperty Google App Engine

  - by John

  Hi All, I am experimenting with the Google App Engine and have a question. For the sake of simplicity, let's say my app is modeling a computer network (a fairly large corporate network with 10,000 nodes). I am trying to model my Node class as follows: class Node(db.Model): name = db.StringProperty() neighbors = db.SelfReferenceProperty() Let's suppose, for a minute, that I cannot use a ListProperty(). Based on my experiments to date, I can assign only a single entity to 'neighbors' - and I cannot use the "virtual" collection (node_set) to access the list of Node neighbors. So... my questions are: Does SelfReferenceProperty limit you to a single entity that you can reference? If I instead use a ListProperty, I believe I am limited to 5,000 keys, which I need to exceed. Thoughts? Thanks, John

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• How are deleted and renamed/moved files handled when merging a feature branch with trunk and reinteg

  - by Michael Repucci

  I've got a big-ish project that needs a lot of work on a new feature, so I planned on using a branch to do this work. I haven't had to do this before, and I just wanted to get assurance from an experienced Subversion user that things "should" work smoothly. What I'm especially concerned with is how well Subversion handles deleted, renamed/moved files between a branch and the trunk. That is, if multiple files are deleted or renamed/moved in the branch, but those files continue to be used and receive changes in the trunk, will merges with the trunk still proceed without a hitch (reworking the branch, of course, as necessary)? Also, when I then reintegrate the branch with the trunk, if the files differ greatly in name (or existence) between the trunk and branch, will the reintegration be difficult? Will the files deleted (moved) in the branch now be deleted (moved) in the trunk, or will files linger and conflicts emerge? The SVN book didn't clear up these questions for me, so your experience would be greatly appreciated. Thank you!

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• Clickone + .net client profile framework + sql compact + offline installation

  - by grimmersnee

  am having issues with prerequisites while trying to publish my windows .net 3.5 application using clickonce. I am wanting my application to work offline as well as online, so I want to include the prerequisites in the installation and not make client download them via the internet. My prerequisites are: .Net Framework Client Profile SQL Compact 3.5 I have downloaded the .Net Framework Client Profile Offline Installer. Installed it and put the DotNetFx35Client.exe in this location: C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bootstrapper\Packages\DotNetFx35Client Under the Project - Publish Tab I have checked the "Download prerequisites from the following location" and entered \MachineName\Program Files\Microsoft SDKs\Windows\v6.0A\Bootstrapper\Packages\DotNetFx35Client Following http://stackoverflow.com/questions/1046370?tab=oldest#tab-top I am however still the error: The install location for prerequisites has not been set to 'component vendo's website' file Dotnetfx35client\Dotnetfx35clientSteup.exe' in item .net framework client profile can not be located on disk.

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• Best library to parse HTML with Python 3 and example?

  - by TMC

  I'm new to Python completely and am using Python 3.1 on Windows (pywin). I need to parse some HTML, to essentially extra values between specific HTML tags and am confused at my array of options, and everything I find is suited for Python 2.x. I've read raves about Beautiful Soup, HTML5Lib and lxml, but I cannot figure out how to install any of these on Windows. Questions: What HTML parser do you recommend? How do I install it? Do you have a simple example on how to use the recommended library to snag HTML from a specific URL and return the value out of say something like this: fooLink (say we want to return "/blahblah")

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• Django: Determining if a user has voted or not

  - by TheLizardKing

  I have a long list of links that I spit out using the below code, total votes, submitted by, the usual stuff but I am not 100% on how to determine if the currently logged in user has voted on a link or not. I know how to do this from within my view but do I need to alter my below view code or can I make use of the way templates work to determine it? I have read http://stackoverflow.com/questions/1528583/django-vote-up-down-method but I don't quite understand what's going on ( and don't need any ofjavascriptery). Models (snippet): class Link(models.Model): category = models.ForeignKey(Category, blank=False, default=1) user = models.ForeignKey(User) created = models.DateTimeField(auto_now_add=True) modified = models.DateTimeField(auto_now=True) url = models.URLField(max_length=1024, unique=True, verify_exists=True) name = models.CharField(max_length=512) def __unicode__(self): return u'%s (%s)' % (self.name, self.url) class Vote(models.Model): link = models.ForeignKey(Link) user = models.ForeignKey(User) created = models.DateTimeField(auto_now_add=True) def __unicode__(self): return u'%s vote for %s' % (self.user, self.link) Views (snippet): links = Link.objects.select_related().annotate(votes=Count('vote')).order_by('-created')

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• posmax: like argmax but gives the position(s) of the element x for which f[x] is maximal

  - by dreeves

  Mathematica has a built-in function ArgMax for functions over infinite domains, based on the standard mathematical definition. The analog for finite domains is a handy utility function. Given a function and a list (call it the domain of the function), return the element(s) of the list that maximize the function. Here's an example of finite argmax in action: http://stackoverflow.com/questions/471029/canonicalize-nfl-team-names/472213#472213 And here's my implementation of it (along with argmin for good measure): (* argmax[f, domain] returns the element of domain for which f of that element is maximal -- breaks ties in favor of first occurrence. *) SetAttributes[{argmax, argmin}, HoldFirst]; argmax[f_, dom_List] := Fold[If[f[#1]>=f[#2], #1, #2]&, First[dom], Rest[dom]] argmin[f_, dom_List] := argmax[-f[#]&, dom] First, is that the most efficient way to implement argmax? What if you want the list of all maximal elements instead of just the first one? Second, how about the related function posmax that, instead of returning the maximal element(s), returns the position(s) of the maximal elements?

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• Why is the CoreData stack in XCode's CoreData enabled template treated as private?

  - by rob5408

  In regards to XCode templates with CoreData enabled, I've read http://stackoverflow.com/questions/2729055/unclear-use-of-property-in-window-app-using-core-data which goes over the 'what' in the templates. But I am having an issue with the 'why'. By declaring the category in the implementation file, the CoreData accessors act like private methods. The problem with that is whenever you want to use CoreData elsewhere in your app, you need some extra code. I've figured you need to either supply your own method that exposes the managed object context, such as... - (NSManagedObjectContext *)getManagedObjectContext { return self.managedObjectContext; } ...which will allow other parts of your app to use it. Or you would need to jam pack your app delegate with specific methods to return managed objects, ie getProducts or setUser. Can anyone shed light on the reasoning here?

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• jQuery autocomplete works with a local string but not when the same String is called off the server

  - by Ankur

  This is related to the question I asked at http://stackoverflow.com/questions/2802948/how-to-make-an-ajax-call-immediately-on-document-loading My code is: $(document).ready(function(){ $.ajax({ type: "GET", url: "../AutoComplete", success: function(data) { var dataArray = data; alert(dataArray); $("#example").autocomplete(dataArray); } }); }); The value that is printed in the alert is: "Manuscript|Text|Information Object|Basketball|Ball|Sporting Equipment|Tarantula|Spider|Australian Spider|Cricket Player|Medieval Artefact|Person|Sportsperson|Leonardo Da Vinci|Country|Language|Inventor|Priest|Electronics Manufacturer|Object|letter|Artefact|governance model|Organism|Animal".split("|"); If instead I do this: $(document).ready(function(){ $.ajax({ type: "GET", url: "../AutoComplete", success: function(data) { var dataArray = "Manuscript|Text|Information Object|Basketball|Ball|Sporting Equipment|Tarantula|Spider|Australian Spider|Cricket Player|Medieval Artefact|Person|Sportsperson|Leonardo Da Vinci|Country|Language|Inventor|Priest|Electronics Manufacturer|Object|letter|Artefact|governance model|Organism|Animal".split("|"); alert(dataArray); $("#example").autocomplete(dataArray); } }); }); It works fine?

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• Puzzled with nib files...

  - by Michael

  I know nib files are serialized objects and they have owner, outlets to make connections. Using XCode Navigation window template I created application, which in its order created 2 nib files - MainWindow and SecondView. I can't understand how MainWindow is referring to SecondView, there is no connection between those two as far as I can see. SecondView's owner is UIViewController and in MainWindow there is a navigation tab which is also UIViewController. But how they are connected in IB I can't understand... Also I don't understand who is instanciating MainWindow's owner object and where that object is being kept, where is the variable which is UIApplication myApp = [[UIApplication alloc] init]. If I create 10 nib files with UIViewController owner, who will trigger their deserialization? If some class is nib file's owner, what is the essential responsibilities of that class? Is it deserializing nib file into memory? Sorry for unorganized questions, I've been reading numerous articles and docs about nib files, but it is still confusing.

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• How do I read the cache of Chrome and Firefox programmatically on the Mac?

  - by John Gallagher

  Background I want to access the cache of Chrome and Firefox in my Cocoa application. I need to get the HTML for pages accessed recently. Safari is a piece of cake - all this information is available in SQLite data stores, but not so in Chrome and Firefox. The Problem For Firefox, the cache is in /Library/Caches/Firefox/Profiles/xxx.default/Cache with filenames _CACHE_001_ _CACHE_002_ _CACHE_003_ and _CACHE_MAP_ For Chrome, the cache is in /Library/Caches/Google/Chrome/Default/Cache with filenames data_0 data_1 data_2 and data_3 What I've tried The only article I can find that sheds any light on what format these caches are in is here. It recommends a Cache Viewer tool, but doesn't explain how one might do this programmatically. Questions Is there any way of reconstructing this data using command line tools or the Cocoa framework? Or is it much too low level? Is there another way of getting at the HTML of recent web pages that I don't know about?

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• Rails: how do you access RESTful helpers?

  - by Ethan

  I'm trying to work through this guide to Rails routing, but I got stuck in section 3.3: Creating a RESTful route will also make available a pile of helpers within your application and then they list some helpers like photos_url, photos_path, etc. My questions: Where can I find the complete list of helpers that is "made available?" Is there a way to call the helpers in the console? I created an app, then opened up the console with script/console. I tried to call one of the helpers on the console like this: >> entries_url But got: NameError: undefined local variable or method `entries_url' for #<Object:0x349a4> from (irb):8

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