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• ASIHTTPRequest code design

  - by nico

  I'm using ASIHTTPRequest to communicate with the server asynchronously. It works great, but I'm doing requests in different controllers and now duplicated methods are in all those controllers. What is the best way to abstract that code (requests) in a single class, so I can easily re-use the code, so I can keep the controllers more simple. I can put it in a singleton (or in the app delegate), but I don't think that's a good approach. Or maybe make my own protocol for it with delegate callback. Any advice on a good design approach would be helpful. Thanks.

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• WPF - Binding a color resource to the data object within a DataTemplate

  - by John

  I have a DataTemplate and a SolidColorBrush in the DataTemplate.Resources section. I want to bind the color to a property of the same data object that the DataTemplate itself is bound to. However, this does not work. The brush is ignored. Why? <DataTemplate DataType="{x:Type data:MyData}" x:Name="dtData"> <DataTemplate.Resources> <SolidColorBrush x:Key="bg" Color="{Binding Path=Color, Converter={StaticResource colorConverter}" /> </DataTemplate.Resources> <Border CornerRadius="15" Background="{StaticResource bg}" Margin="0" Opacity="0.5" Focusable="True"> </DataTemplate>

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• ORM market analysis

  - by bonefisher

  I would like to see your experience with popular ORM tools outhere, like NHibernate, LLBLGen, EF, S2Q, Genom-e, LightSpeed, DataObjects.NET, OpenAccess, ... From my exp: - Genom-e is quiet capable of Linq & performance, dev support - EF lacks on some key features like lazy loading, Poco support, pers.ignorance... but in 4.o it may have overcome .. - DataObjects.Net so far good, althrough I found some bugs - NHibernate steep learning curve, no 100% Linq support (like in Genom-e and DataObjects.Net), but very supportive, extensible and mature

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• "'data(...).options' is null or not an object" in jquery-ui

  - by ripper234

  I'm using jquery-ui 1.8, and getting this error in Internet Explorer: Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E) Timestamp: Mon, 10 May 2010 06:26:48 UTC Message: 'data(...).options' is null or not an object Line: 75 Char: 13074 Code: 0 URI: http://localhost:58365/Scripts/Lib/jquery-ui-1.8.custom.min.js Is this a known bug? Is there a workaround? The error happens when I use droppable/draggable.

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• Kohana ORM Aliasing and "Trying to get property of non-object"

  - by Toto

  I have the following tables in the database: teams: id name matches: id team1_id team2_id I've defined the following ORM models in my Kohana application: class Match_Model extends ORM { protected $belongs_to = array('team1_id' => 'team', 'team2_id' => 'team'); } class Team_Model extends ORM { protected $has_many = array('matches'); } The following code in a controller: $match = ORM::factory('match',1); echo $match->team1_id->name; /* <-- */ Is throwing the following error on the linke marked with /* <--- */: Trying to get property of non-object The framework is yielding the value of the foreign key instead of a reference to a Match_Model instance as it should (giving the has_many and belongs_to properties stated). Am I missing something? Note: Just in case, I've added the irregular plural 'match' => 'matches' in application/config/inflector.php

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• Vertex Buffer Object not drawing in SDL window

  - by intregus

  I'm just using the opengl SDL template with Xcode, and everything runs fine. I removed the Atlantis code, and changed the main extension to .mm, then added some testing code to drawGL. Drawing a simple triangle (using immediate mode) at this point inside drawGL gives me a white triangle, but when I add the code to draw using a vertex buffer object, i just get a black window. Here is my VBO drawing code: glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer glLoadIdentity(); GLuint buffer; float vertices[] = { 0.0f, 1.0f, 0.0f, -1.0f,-1.0f, 0.0f, 1.0f,-1.0f, 0.0f }; // VBO doesn't work :( glGenBuffers(1, &buffer); glBindBuffer(GL_ARRAY_BUFFER, buffer); glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 9, vertices, GL_STATIC_DRAW); glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(3, GL_FLOAT, 0, vertices); glDrawArrays(GL_TRIANGLES, 0, 3); glDisableClientState(GL_VERTEX_ARRAY);

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• Get data to android app from mysql server

  - by Fabian

  Hi i have an mysql database with some sports results in it. I want to write an android application to display these data on mobile phones. I´ve searched on the internet for this issue and i think it is not possible to have a direct connection between the mysql database and the android application. (Is this right?) So my question is the following: How can i have access in the android application to the mysql database in order to display some of the data? Thank you for your answers! Fabian

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• unable to connect to database on a networked drive

  - by thegunner

  Hi, I'm trying to connect to an access database from a php script using ODBC. When I put the db on my local c: drive create a system DSN i can connect no problem, but when it's on the networked drive I get the error: Warning: odbc_connect() [function.odbc-connect]: SQL error: [Microsoft][ODBC Microsoft Access Driver] '(unknown)' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides., SQL state S1009 in SQLConnect in C:\wamp\www\suppliers\furniture.php on line 3 Ok so I'm guessing it's permissions somewhere anyone know specifically what/where? Thanks,

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• Create IMAP account in Outlook 2007 programmatically

  - by jessicah

  Hi, we're rolling out a new voicemail system, and trying to figure out a way to programmatically add a new IMAP account to a user's Outlook. Idea is that I create a form that takes a bunch of fields needed, and creates it all for them.

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• Django 1.2 object level permissions - third party solutions?

  - by mawimawi

  Since Django 1.2 final is almost out, I am curious if there are already projects that use the new object level permissions / row level permissions system. [django-authority][1] which is a possible solution for Django up to 1.1 has not been updated for a while, and does not (yet) use the new permissions system. It seems to me that Django-Authority is in a comatose state. Does someone know about upcoming or maybe even finished solutions? I'd appreciate any good links to active projects with at least some downloadable content very much. [1]: http://packages.python.org/django-authority/ django-authority

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• Constant expression with custom object

  - by nils

  I'm trying to use an instant of a custom class as a template parameter. class X { public: X() {}; }; template <class Foo, Foo foo> struct Bar { }; const X x; Bar<X, x> foo; The compiler states that x cannot appear in a constant expression. Why that? There is everything given to construct that object at compile time.

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• How to work-around "Object required" error when adding a variable in an ATL Dialog

  - by Toto

  I'm using Visual Studio .NET 2003 to develop a COM ATL application in unmanaged Visual C++. I've created a ATL Dialag and whenever I try to add a variable for a control the wizard thorws the message "Object required". I've tried the following alternatives: Right click in the control to call "Add variable" from there: this way the wizard does not thorws the message but the variable is not created. This post, but it is for VS2005. Does anyone knows any work-around-around for this problem? Or what the wizard actually does so I can do it manually?

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• Constructing an object and calling a method without assignment in VB.Net

  - by mdryden

  I'm not entirely sure what to call what C# does, so I haven't had any luck searching for the VB.Net equivalent syntax (if it exists, which I suspect it probably doesn't). In c#, you can do this: public void DoSomething() { new MyHelper().DoIt(); // works just fine } But as far as I can tell, in VB.Net, you must assign the helper object to a local variable or you just get a syntax error: Public Sub DoSomething() New MyHelper().DoIt() ' won't compile End Sub Just one of those curiosity things I run into from day to day working on mixed language projects - often there is a VB.Net equivalent which uses less than obvious syntax. Anyone?

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• SQL-Calculate percentages from database table values

  - by Howard

  Hi, Im trying to calculate the percentages of selected fields from tables. Within the fields that data is numeric but I want to show the percentage value. Please help. private void btnpics_Click(object sender, EventArgs e) { try { myCon.Open(); string queryString = "SELECT FoodType.Description,FoodType.Calories, FoodType.Carbohydrate, FoodType.Fat, FoodType.Protein FROM [FoodType], [Meal] WHERE (Meal.UserID =" + userid.Text + ") AND (Meal.MealDate =" + date.Text + ");"; MessageBox.Show(queryString); loadDataGrid(queryString); } catch (Exception ex) { MessageBox.Show(ex.Message); } }

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• Accessing the Private Constructor

  - by harigm

  I am java developer, went for an interview. I have been asked a question about the Private constructor 1) Can I access a Private Constructor of a Class and Instantiate the class. I was thinking and gave the answer directly--- "NO" But its wrong, can any one help Why NO? and How we can achieve this

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• Database independent row level security solution

  - by Filip

  Hi, does anybody knows about Java/C# database independent authorization library. This library should support read, write, delete, insert actions across company organizational structure. Something like this: - user can see all documents - user can enter new document assigned to his unit - user can change all documents assigned to his unit and all subordinate units. - user can delete documents that are assigned to him I should also be able to create custom actions (besides read, write,...) connect them to certain class and assign that "security token" to user (e.g. document.expire). If there aren't any either free or commercial libraries, is there a book that could be useful in implementing this functionality? Thanks.

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• looking for automated modeling tool for ASP.Net class diagramming

  - by alchemical

  I'm walking into a project with 500+ classes, and am wondering if anyone has had good experiences with automated modeling tools that can import from ASP.Net /C#? It would be a bonus if I could get an automated model based on all the objects called to completely load a single ASP.Net page, with relationships indicating which objects are calling out to which other ones, etc. Thanks for sharing your thoughts or recomendations.

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• Wrappers/law of demeter seems to be an anti-pattern...

  - by Robert Fraser

  I've been reading up on this "Law of Demeter" thing, and it (and pure "wrapper" classes in general) seem to generally be anti patterns. Consider an implementation class: class Foo { void doSomething() { /* whatever */ } } Now consider two different implementations of another class: class Bar1 { private static Foo _foo = new Foo(); public static Foo getFoo() { return _foo; } } class Bar2 { private static Foo _foo = new Foo(); public static void doSomething() { _foo.doSomething(); } } And the ways to call said methods: callingMethod() { Bar1.getFoo().doSomething(); // Version 1 Bar2.doSomething(); // Version 2 } At first blush, version 1 seems a bit simpler, and follows the "rule of Demeter", hide Foo's implementation, etc, etc. But this ties any changes in Foo to Bar. For example, if a parameter is added to doSomething, then we have: class Foo { void doSomething(int x) { /* whatever */ } } class Bar1 { private static Foo _foo = new Foo(); public static Foo getFoo() { return _foo; } } class Bar2 { private static Foo _foo = new Foo(); public static void doSomething(int x) { _foo.doSomething(x); } } callingMethod() { Bar1.getFoo().doSomething(5); // Version 1 Bar2.doSomething(5); // Version 2 } In both versions, Foo and callingMethod need to be changed, but in Version 2, Bar also needs to be changed. Can someone explain the advantage of having a wrapper/facade (with the exception of adapters or wrapping an external API or exposing an internal one).

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• 'NoneType' object has no attribute 'day'

  - by Asinox

  Hi guy, i dont know where is my error, but Django 1.2.1 is give this error: 'NoneType' object has no attribute 'day' when i try to save form from the Administrator Area models.py from django.db import models from django.contrib.auth.models import User class Editorial(models.Model): titulo = models.CharField(max_length=250,help_text='Titulo del editorial') editorial = models.TextField(help_text='Editorial') slug = models.SlugField(unique_for_date='pub_date') autor = models.ForeignKey(User) pub_date = models.DateTimeField(auto_now_add=True) activa = models.BooleanField(verbose_name="Activa") enable_comments = models.BooleanField(verbose_name="Aceptar Comentarios",default=False) editorial_html = models.TextField(editable=False,blank=True) def __unicode__(self): return unicode(self.titulo) def get_absolute_url(self): return "/editorial/%s/%s/" % (self.pub_date.strftime("%Y/%b/%d").lower(), self.slug) class Meta: ordering=['-pub_date'] verbose_name_plural ='Editoriales' def save(self,force_insert=False, force_update=False): from markdown import markdown if self.editorial: self.editorial_html = markdown(self.editorial) super(Editorial,self).save(force_insert,force_update) i dont know why this error, thanks guys sorry with my English

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• Parsing XML feed into Ruby object using nokogiri?

  - by Galen King

  Hi all, I am pretty green with coding in Ruby but am trying to pull an XML feed into a Ruby object as follows (ignore the ugly code please): <% doc = Nokogiri::XML(open("http://api.workflowmax.com/job.api/current?apiKey=#{@feed.service.api_key}&accountKey=#{@feed.service.account_key}")) %> <% doc.xpath('//Jobs/Job').each do |node| %> <h2><%= node['name'].text %></h2> <p><%= node['description'].text %></p> <% end %> Basically I want to iterate through each Job and output the name, description etc. What am I missing? Many thanks, Galen

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• fluent nHibernate mapping of subclassed structure

  - by Codezy

  I have a workflow class that has a collection of phases, each phase has a collection of tasks. You can design a workflow that will be used by many engagements. When used in engagement I want to be able to add properties to each class (workflow, phase, and task). For example a task in the designer does not have people assigned, but a task in an engagement would need extra properties like who is assigned to it. I have tried many different approaches using subclasses or interfaces but I just can't get it to map the way I want. Currently I have the engagement level versions as subclasses, but I can't get Engagement phases to map to engagement workflows. Public Class WorkflowMapping Inherits ClassMap(Of Workflow) Sub New() Id(Function(x As Workflow) x.Id).Column("Workflow_Id").GeneratedBy.Identity() Map(Function(x As Workflow) x.Description) Map(Function(x As Workflow) x.Generation) Map(Function(x As Workflow) x.IsActive) HasMany(Function(x As Workflow) x.Phases).Cascade.All() End Sub End Class Public Class EngagementWorkflowMapping Inherits SubclassMap(Of EngagementWorkflow) Sub New() Map(Function(x As EngagementWorkflow) x.ClientNo) Map(Function(x As EngagementWorkflow) x.EngagementNo) End Sub End Class How would you approach mapping this in fluent (or hbm) so that you could load just the workflow base class when designing the flow, or the engagement subclass versions of each when being used by an engagement?

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• prevent bots to query my database several times

  - by Alain

  Hi all, I'm building an application that is a kind of registry. Think about the dictionary: you lookup for a word and it return something if the word is founded. Now, that registry is going to store valuable informations about companies, and some could be tempted to get the complete listing. My application use EJB 3.0 that replies to WS. So I was thinking about permits a maximum of 10 query per IP address per day. Storing the IP address and a counter on a table that would be empty by a script every night. Is it a good idea/practice to do so? If yes, how can I get the IP address on the EJB side? Is there a better way to prevent something to get all the data from my database? I've also though about CAPTCHA but I think it's a pain for the user, and sometime, they are difficult to read even for real human. Hope it's all clear since I'm not english... Thanks Alain

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• Converting a large SQL Server Database to Azure Storage

  - by Laith

  Hi guys, I have a very large database structure, (Data is not important at this point, I can migrate the info in the db pretty easily if the structure is done) , all reside in SQL Server and I even published it to SQL Azure, but thinking about the limitation of SQL Azure in size, made me decide to switch most of the tables that do not need all the bells and whistles of SQL Azure to Azure Table and blob storage. I was thinking of creating a TT template that dose that, but was wondering if their is a tool that do that. Any ideas or thoughts. The only tables that i would keep in SQL Azure would anything related to transactions like payments. Appreciate your thoughts and advice

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• SoundChannel object plays small portion after being stopped and played again

  - by gok

  SoundChannel object is stopped and played again. When played again it plays small portion from the previous position and suddenly jumps back to the beginning. It doesn't play the whole sound before looping. This happens only once, then it loops normally. It happens again if I stop and play. public function play():void { channel = clip.play(trimIn); volume(currentVolume); isPlaying = true; timer.start(); channel.addEventListener(Event.SOUND_COMPLETE, loopMusic); } public function loopMusic(e:Event=null):void { if (channel != null) { timer.stop(); channel.removeEventListener(Event.SOUND_COMPLETE, loopMusic); play(); } } Do I need to somehow reset the soundChannel?

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• In a digital photo, how can I detect if a mountain is obscured by clouds?

  - by Gavin Brock

  The problem I have a collection of digital photos of a mountain in Japan. However the mountain is often obscured by clouds or fog. What techniques can I use to detect that the mountain is visible in the image? I am currently using Perl with the Imager module, but open to alternatives. All the images are taken from the exact same position - these are some samples. My naïve solution I started by taking several horizontal pixel samples of the mountain cone and comparing the brightness values to other samples from the sky. This worked well for differentiating good image 1 and bad image 2. However in the autumn it snowed and the mountain became brighter than the sky, like image 3, and my simple brightness test started to fail. Image 4 is an example of an edge case. I would classify this as a good image since some of the mountain is clearly visible. UPDATE 1 Thank you for the suggestions - I am happy you all vastly over-estimated my competence. Based on the answers, I have started trying the ImageMagick edge-detect transform, which gives me a much simpler image to analyze. convert sample.jpg -edge 1 edge.jpg I assume I should use some kind of masking to get rid of the trees and most of the clouds. Once I have the masked image, what is the best way to compare the similarity to a 'good' image? I guess the "compare" command suited for this job? How do I get a numeric 'similarity' value from this?

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