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• C Objects in Objective-C

  - by paul simmons

  Hi, I couldn't find a clear explanation, just asking to be sure; are C data types handled same way (in terms of memory management) in Obj.C? i.e. they are created on stack, released immediately etc.? So they differ from Obj.C objects? Or may we make an analogy with C# (just an analogy not exactly) so that C types are handled as 'value types' and Obj.C objects as 'reference types'?

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• Rails form helpers: how to add an element to a collection?

  - by Laran Evans

  I have a keychain object. keychain has_many credentials. I'm trying to write the view code to add a new credential to a keychain. This is the code I have: <% form_for(@keychain) do |f| % <tr <td<%= f.select "credentials[]", current_account.services.collect{ |s| [s.friendly_name, s.id] } %</td <td<%= f.text_field 'credentials', :username %</td <td<%= f.password_field 'credentials', :password %</td </tr <% end % But it fails with this message: NoMethodError in Keychains#new Showing app/views/keychains/_keychain_form.html.erb where line #32 raised: undefined method `credentials[]' for # What am I doing wrong?

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• i got an error in login code

  - by user298349

  I tried writing a login code in vc#..i got the following error..'The type or namespace name 'LoginControl' does not exist in the namespace 'ErikSchmidt' (are you missing an assembly reference?)' Pls help me rectify this error.

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• Mocha expects method

  - by Masha

  So my situation is: I have a 2 modules that have the same structure like that: module Module1 class Config def fee_rate 2 end end end So, say, Module2 would have class Config with the method fee_rate, just with a different value (those are actually implemented in a rails engine, but it shouldn't matter) and then my model can use either Module1 or Module2 to get the fee rate value like that: def config @config ||= "#{module_name.titleize}::Config".constantize.new @config end def get_value config.get_fee * some_other_value end What I'm trying to test is if get_fee function was called on the correct class: "#{model.module_name.titleize}::Config".constantize.any_instance.expects(:get_fee).at_least_once model.get_value and on the line when I call get_value I get the following error - undefined method `*' for nil:NilClass. I'm completely lost now, so I'd appreciate any help and ideas.

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• How can I safely decide if a variable is a string of more than one characters?

  - by Alan

  I am using the following Javascript: if (typeof content !== 'undefined' && content.length > 0) { $state.transitionTo('admin.content', { content: content }) } I thought this was safe to use but it gives me an error saying: TypeError: Cannot read property 'length' of null I am using the following function to decide if something is a number: isNumber: function (num) { // Return false if num is null or an empty string if (num === null || (typeof num === "string" && num.length === 0)) { return false; } var rtn = !isNaN(num) return rtn; }, How can I write a similar function that would very safely determine if something is a string with a length of more than 0?

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• How do i get ServletContext object in a simple class file?

  - by Nitesh Panchal

  Hello, I am creating a simple web application. I need to get reference to ServletContext object in that class. How can i get it?

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• PHP Array Efficiency and Memory Clarification

  - by CogitoErgoSum

  When declaring an Array in PHP, the index's may be created out of order...I.e Array[1] = 1 Array[19] = 2 Array[4] = 3 My question. In creating an array like this, is the length 19 with nulls in between? If I attempted to get Array[3] would it come as undefined or throw an error? Also, how does this affect memory. Would the memory of 3 index's be taken up or 19? Also currently a developer wrote a script with 3 arrays FailedUpdates[] FailedDeletes[] FailedInserts[] Is it more efficient to do it this way, or do it in the case of an associative array controlling several sub arrays "Failures" array(){ ["Updates"] => array(){ [0] => 12 [1] => 41 } ["Deletes"] => array(){ [0] => 122 [1] => 414 [1] => 43 } ["Inserts"] => array(){ [0] => 12 } }

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• C#, XmlDocument, and special ISO Latin characters

  - by Trent

  I'm trying to load up xml into an XmlDocument, but it doesn't recognize the encoded '&eacute' and throws an error 'An error occurred while parsing Entity Name'. Now I can add a custom entity set in a DTD of my xml, so the XmlDocument loads properly. But what I'm hoping is that I can reference a url that has a common set of these ISO Latin encoded characters. Is this possible, or do I need to inject a custom list of DTD sets?

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• has_many through and partials

  - by user307428

  I have a User model, a Post model, and an Interest model. Using User has_many posts through interests Using User has_many interests Using Post has_many users through interests Using Post has_many interests Using Interest belongs to Post Using Interest belongs to User Application_Controller is as follows: class ApplicationController < ActionController::Base before_filter :login_from_cookie before_filter :find_user_interests helper :all # include all helpers, all the time session :session_key = '_blah_session' include AuthenticatedSystem def find_user_interests @user_interests = current_user ? current_user.interests : [] true end Application.html.erb has as follows: <%= render :partial = "users/interests", :object = @user_interests % _interests.html.erb partial is as follows: ul <% unless current_user.nil? then -% <% @user_interests.each do |interest| -% li<%= interest.post.title %/li <% end % <% end -% /ul Given all this when I at localhost:3000/posts/1 my partial shows up fine, but when in localhost:3000/posts I get an error "undefined method `title' for nil:NilClass" thus an error in the line li<%= interest.post.title %/li shown above in the _interests.html.erb partial. What the heck would be the issue? TIA end

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• How to uncheck header checkbox in GridView when sorting and paging?

  - by OutOFTouch

  Hi, I followed this article and it works great except when paging or sorting the HeaderCheckBox is still checked. How and where should this be unchecked? I think it would be best to uncheck it in the control itself, but I am not having any luck even getting a reference to it using this code: protected override void OnSorted(EventArgs e) { base.OnSorted(e); if (AutoGenerateCheckBoxColumn) { CheckBox cb = (CheckBox) HeaderRow.FindControl(String.Format(HeaderCheckBoxId, ClientID)); if(cb != null) { cb.Checked = false; } } } Thanks

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• looking for a javascript engine

  - by c0f33.alex

  i'm looking for a js engine to that I can (easily) expose C/C++ functions, classes etc. The API should allow changing exposed values from within C++ (by storing some kind of pointer or reference to an object inside js or so...). I've considered using google's v8 but I'm new to it and don't know whether it will satisfy my requirements. Can someone tell me whether I should stick to v8 or try something else?

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• ldd output showing shared object file whose function is not called

  - by iamrohitbanga

  I ran ldd command on an executable created by Open MPI. It shows a reference to libpthread.so Using LD_PRELOAD variable I created my own implementation of pthread_create, but from the it output it seems that MPI implementation is not calling pthread_create as I had expected. Why does ldd show pthread so file in output if it is not being used? does Open MPI not use a separate MPI thread for every node to implement the functionality?

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• android threads

  - by rantravee

  Hi, I'm searching for some good material on android threads but I couldn't find references for a complete description about this subject. So if you know any valuable reference please point them to me.

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• how can i get the gmail contact of my account in my application (.net)?

  - by Surya sasidhar

  hi, how can i get the g mail contact of my account in asp.net any reference or any code to import the contact of gmail. thank you

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• how to get text box value in page init?

  - by Amit

  Hi I am using asp.net 2.0 I set a hidden text box from javascript and on postback, i want to check the value stored on the text box in page init event. Here is what i tried string t = Request.Form["currentMode"].ToString(); but i get an error saying " Object reference not set to an instance of an object." Any idea?asp.

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• Windows Journal Eraser functionality

  - by Nitz

  Hey guys I want to add Eraser functionality in my software. I look down in the SDK of Windows Tablet PC SDK but i can't find any solution for that. there is one eraser sample in that SDK but that is not similar to feature which is in Windows Journal. DOES ANYONE KNOW HOW TO ADD THAT ERASER FEATURE IN MY C# APPLICATION [I WANT SAME AS IN WINDOWS JOURNAL]? btw i am taking reference from Microsoft Windows XP Tablet PC Edition Software Development Kit 1.7.

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• jQuery UI sortable issue

  - by colourandcode

  When I try to use a sortable event . (For instance the stop() event) It only works when I bind it using : $('.selector').bind('sortstop', function(event, ui) { ... }); rather than $('.selector').sortable({ stop: function(event, ui) { ... } }); Is there a missing piece in this? The only reason I ask is because when I bind using the actual bind() method it's not giving me access to the event or ui parameters I pass in. I'm always returned undefined.

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• using full domains in a multi-site application set up

  - by mike in africa

  hi, i'm building a multi-site application where a client must be able to use his own domain (as oppose to just a subdomain). i like to know the different ways to go about it, and what configuration is needed on both end when/if the client wishes to handle email hosting externally. any reference to lxadmin/hypervm would be helpful too. tx~ edit: i'm running apache; no ssl requirement.

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• JQuery add hidden element to form programmatically

  - by vanzylv

  Hi Guys This is really getting to me now.I have a form that loads when the page loads.In my jquery 'ready' function I append a hidden to that form like so : $("<input id='thehidden' type='hidden' name='thehidden' value='hiddenval'>").appendTo("#MenuForm") When I check the form content with firebug i can see the element is added. ["$(\"#MenuForm\").children()"] is [div, input#thehidden hiddenval] All good so far.When I submit this form and try and read the elemet again,i can't get the value of the new hidden val I added. alert($('#thehidden').val()) is undefined Any help would be appreciated

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• Explicitly typing variables causes compiler to think an instance of a builtin type doesn't have a pr

  - by wallacoloo

  I narrowed the causes of an AS3 compiler error 1119 down to code that looks similar to this: var test_inst:Number = 2.953; trace(test_inst); trace(test_inst.constructor); I get the error "1119: Access of possibly undefined property constructor through a reference with static type Number." Now if I omit the variable's type, I don't get that error: var test_inst = 2.953; trace(test_inst); trace(test_inst.constructor); it produces the expected output: 2.953 [class Number] So what's the deal? I like explicitly typing variables, so is there any way to solve this error other than not providing the variable's type?

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• Open source simple C++ with wxWidgets GUI applications

  - by Thi

  Hi, I would like to write a simple GUI application using C++ and wxWidgets. I'm wondering if there are any open source GUI applications using C++ and wxWidgets and tutorials for reference. Thanks,

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• Facebook Like Button (<fb:like>) Height Always 80px

  - by David

  Why is the height of my Facebook Like button (technically the iframe that gets generated) always getting set to 80px? Example page is here: http://www.davidkasper.net/test.html I am using the javascript sdk and have had it work on other pages but for some reason the height will not change dynamically on this one! I can even do something like <fb:like style="height:40px"> and that will indeed set the visible height, but the iframe will still be 80px, whereas I can see it changing in the demo at http://developers.facebook.com/docs/reference/plugins/like

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• How do I write raw binary data in Python?

  - by Chris B.

  I've got a Python program that stores and writes data to a file. The data is raw binary data, stored internally as str. I'm writing it out through a utf-8 codec. However, I get UnicodeDecodeError: 'charmap' codec can't decode byte 0x8d in position 25: character maps to <undefined> in the cp1252.py file. This looks to me like Python is trying to interpret the data using the default code page. But it doesn't have a default code page. That's why I'm using str, not unicode. I guess my questions are: How do I represent raw binary data in memory, in Python? When I'm writing raw binary data out through a codec, how do I encode/unencode it?

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• Skin Twitter HTML and CSS

  - by hagope

  I am building a twitter application and would like to use the structure of the their homepage. Can anyone suggest how to go about doing this, or point to a reference that does this? I do not intend to use any images that would be considered copyright, I just want to use the single column layout, with the side panel, header, footer. Thanks!

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• How do I output JSON columns in jQuery

  - by Mel

  I'm using the qTip jQuery plugin to create dynamic tool tips. The tooltip sends an id to a cfc which runs a query and returns data in JSON format. At the moment, the tooltip loads with the following: {"COLUMNS:" ["BOOKNAME","BOOKDESCRIPTION"["MYBOOK","MYDESC"]]} Here's the jQuery $('#catalog a[href]').each(function() { var gi = parseInt($(this).attr("href").split("=")[1]) $(this).qtip( { content: { url: 'cfcs/viewbooks.cfc?method=bookDetails', data: { bookID: gi }, method: 'get', title: { text: $(this).text(), button: 'Close' } }, api :{ onContentLoad : function(){ } }, }); }); As I mentioned, the data is returned successfully, but I am unsure how to output it and format it with HTML. I tried adding content: '<p>' + data.BOOKNAME + '' to api :{ onContentLoad : function(){ ..... to see if I could get it to output something, but I get a 'data is undefined error' What is the correct way to try and output this data with html formatting? Many thanks!

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