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• Storing callbacks in a dictionary (Objective C for the iPhone)

  - by Casebash

  I am trying to store callbacks in a dictionary. I can't use blocks as the iPhone doesn't support this (unless you use plblocks). I tried using functions, but apparently NSMutableDictionary doesn't allow these pointers (wants an id) I tried using class methods, but I couldn't find a way to obtain a pointer to these I could try using functions with the c++ stl hashmap (if it is supported in Objective C++), but apparently this can slow compilation times. I could try storing both a class and a selector, but that seems rather messy. What would be the best way to do this?

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• How to Get Current Weather via Web Services

  - by Brandon

  I am attempting to get the current weather given a zip code or a set of latitude/longitude coordinates. It appears that best practice to do this (and how NOAA does it) is to get the XML feed for a weather station. Example: http://www.weather.gov/xml/current_obs/KEDW.xml The only problem is that NOAA doesn't provide a good way to find the closest weather station given a zip code or coordinates and I did not see any hosted web services out there that will provide this mapping. Does anyone know of any web services to get the nearest weather station given a zip code or coordinate input? If not, does anyone have any great solutions to look into that provide similar information as NOAA does but takes in a zip code or coordinates?

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• Organizing source code in TFS 2010

  - by Rick

  We have just gotten TFS 2010 up and running. We will be migrating our source into TFS but I have a question on how to organize the code. TFS 2010 has a new concept of project collections so I have decided that different groups within our organization. My team develops many different web applications and we have several shared components. We also use a few third party components (such as telerik). Clearly each web application is it's own project but where do I put the shard components? Should each component be in it's own project with separate builds and work items? Is there a best practice or recommended way to do this specific to TFS 2010?

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• Equals method of System.Collections.Generic.List<T>...?

  - by Sambo

  I'm creating a class that derives from List... public class MyList : List<MyListItem> {} I've overridden Equals of MyListItem... public override bool Equals(object obj) { MyListItem li = obj as MyListItem; return (ID == li.ID); // ID is a property of MyListItem } I would like to have an Equals method in the MyList object too which will compare each item in the list, calling Equals() on each MyListItem object. It would be nice to simply call... MyList l1 = new MyList() { new MyListItem(1), new MyListItem(2) }; MyList l2 = new MyList() { new MyListItem(1), new MyListItem(2) }; if (l1 == l2) { ... } ...and have the comparisons of the list done by value. What's the best way...?

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• Generating Entity Keys

  - by David Veeneman

  I have run into my first dissapointment with Entity Framework 4. It turns out that SQL CE, when used with EF4, does not support autogenerated primary keys. I get a System.Data.UpdateException from OnjectContext.SaveChanges() with this message: Server-generated keys and server-generated values are not supported by SQL Server Compact. So, now I have to manually generate keys for my entities. Assuming I want to use auto-incremented integer keys, what is the best way to go about generating and keeping track of the keys when using Entity Framework? Thanks for your help.

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• Sending emails to site subscribers

  - by Art

  I have a site where people enter their email address to be reminded of a weekly posting. I only send them the weekly email that they double-opt-in for. I do not sell, trade, expose, or do anything else with their address. Right now I have a bit of a hack, connecting to a large email providers SMTP server to send the emails. As the site grows I fear that my emails will be marked as spam and that I will be violating the TOS of the provider. I'm considering two options, building an in-house SMTP server or using a mailing list service. Is there a best-known-method for this? I'd really prefer to simply build my email and use a script to send them through the SMTP server rather then use some GUI to build the email and import a list of addresses. But previous experience tells me that running a mail server and not being marked as spam can be difficult. Help!?

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• Blog - BlogPost - BlogPostComment vs Blog - Post - Comment

  - by Anton Gogolev

  Don't really know how to formulate the title, but it should be pretty obvious from the example. More specifically, what rules do you use for naming "dependent" classes. For example, Blog is a pretty descriptive name itself, but how do I deal with posts? BlogPost or Post? Clearly, first name clearly expresses that it's a "subordinate" class, but this can quickly get out of hand with BlogPostComment, BlogPostCommentAttachment, etc. Post, on the other hand, looks like an entity completely unrelated to Blog and is easier on the eye. What are your rules/best practices?

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• Loading persisted workflow after workflowdefinition has changed in WF4

  - by Flores

  How to solve this problem (in WF4): I create a workflow in xaml and start several instances of it, I have a persistancestore and all workflows persist on a bookmark half way their workflow. Now I stop the application If I restart te application everything is resumed, en nicely completes. But what if I want to change the workflow definition after the running instances persist? the only way to load the running workflows (that I was able to find) is the following way: WorkflowApplication wfapp = new WorkflowApplication(new WorkflowDefinition()); wfapp.InstanceStore = new SqlWorkflowInstanceStore(connStr); wfapp.Load(wfGuid); So you need the workflow definition, if it has changed during the persistance, things go horribly wrong. What is the best way to solve this?

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• django select max field from mysql when column is varchar

  - by doza

  Hi, Using Django 1.1, I am trying to select the maximum value from a varchar column (in MySQL.) The data stored in the column looks like: 9001 9002 9017 9624 10104 11823 (In reality, the numbers are much bigger than this.) This worked until the numbers incremented above 10000: Feedback.objects.filter(est__pk=est_id).aggregate(sid=Max('sid')) Now, that same line would return 9624 instead of 11823. I'm able to run a query directly in the DB that gives me what I need, but I can't figure out the best way to do this in Django. The query would be: select max(sid+0) from Feedback; Any help would be much appreciated. Thanks!

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• Al Zimmermann's Son of Darts

  - by polygenelubricants

  There's about 2 months left in Al Zimmermann's Son of Darts programming contest, and I'd like to improve my standing (currently in the 60s) to something more respectable. I'd like to get some ideas from the great community of stackoverflow on how best to approach this problem. The contest problem is known as the Global Postage Stamp Problem in literatures. I don't have much experience with optimization algorithms (I know of hillclimbing and simulated annealing in concept only from college), and in fact the program that I have right now is basically sheer brute force, which of course isn't feasible for the larger search spaces. Here are some papers on the subject: A Postage Stamp Problem (Alter & Barnett, 1980) Algorithms for Computing the h-Range of the Postage Stamp Problem (Mossige, 1981) A Postage Stamp Problem (Lunnon, 1986) Two New Techniques for Computing Extremal h-bases Ak (Challis, 1992) Any hints and suggestions are welcome. Also, feel free to direct me to the proper site if stackoverflow isn't it.

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• Dashcode development for iPhone resources

  - by gonso

  I've been developing web applications and iPhone applications for years. Now I want to create a web application oriented to the iPhone browser. I willing to use Dashcode, since it seams to have tons of cool features that make my web app look like an native iPhone app. The problem I face is twofold: On one side I don't know it Dashcode development will allow me to do all I want (session control, runtime datasources, etc); on the other side I'm having a hard time finding good documentation, tutorials and books on Dashcode programing for the iPhone. Looks like 90% of the links out there are for Dashcode widgets. Can you advise me on the best resources to learn Dashcode (for mobile Safari) programming? Thanks Gonso

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• Entity Framework vs. nHibernate for Performance, Learning Curve overall features

  - by hadi

  I know this has been asked several times and I have read all the posts as well but they all are very old. And considering there have been advancements in versions and releases, I am hoping there might be fresh views. We are building a new application on ASP.NET MVC and need to finalize on an ORM tool. We have never used ORM before and have pretty much boiled down to two - nHibernate & Entity Framework. I really need some advice from someone who has used both these tools and can recommend based on experience. There are three points that I am focusing on to finalize - Performance Learning Curve Overall Capability Your advice will be highly appreciated. Best Regards,

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• Problem with Richfaces running with NGinx proxy

  - by Michael

  Hi, I got a problem with my Richfaces application. I am using it with JSF and GlassFish v.2 on my localhost and combination od dataTable and dataScroller works fine. While moving the app to the VPS running Tomcat but proxied by Nginx server, everything crashes. Exactly the scroller is working, but the dataTable view is not refreshed! I looked at responses with Firebug and figured out, that even on VPS the response contains 2nd page of the dataTable, but it is not shown on the screen. I tried everything - changing page attribute of dataScroller (it was taken from session bean, I changed that to request bean). I also removed page attribute from dataScroller - did not help either. Finally I added my table to reRender attribute of dataScroller - still whichever page I choose I am seeing only the first one. Does anyone even heard about such problem? I am going crazy with this. Best regards, Michael

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• IoC container configuration

  - by nivlam

  How should the configuration for an IoC container be organized? I know that registering by code should be placed at the highest level in an application, but what if an application had hundreds of dependencies that need to be registered? Same with XML configurations. I know that you can split up the XML configurations into multiple files, but that would seem like it would become a maintenance hassle if someone had to dig through multiple XML files. Are there any best practices for organizing the registration of dependencies? From all the videos and tutorials that I've seen, the code used in the demo were simple enough to place in a single location. I have yet to come across a sample application that utilizes a large number of dependencies.

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• How to create Python module distribution to gracefully fall-back to pure Python code

  - by Craig McQueen

  I have written a Python module, and I have two versions: a pure Python implementation and a C extension. I've written the __init__.py file so that it tries to import the C extension, and if that fails, it imports the pure Python code (is that reasonable?). Now, I'd like to know what is the best way to distribute this module (e.g. write setup.py) so it can be easily used by people with or without the facility to build, or use, the C extension. My experience is limited but I see two possible cases: User does not have MS Visual Studio, or the GCC compiler suite, installed on their machine, to build the C extension User is running IronPython, Jython, or anything other than CPython. I only have used CPython. So I'm not sure how I could distribute this module so that it would work smoothly and be easy to install on those platforms, if they're unable to use the C extension.

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• How to create Python module distribution to gracefully fall-back to pure Python code

  - by Craig McQueen

  I have written a Python module, and I have two versions: a pure Python implementation and a C extension. I've written the __init__.py file so that it tries to import the C extension, and if that fails, it imports the pure Python code (is that reasonable?). Now, I'd like to know what is the best way to distribute this module (e.g. write setup.py) so it can be easily used by people with or without the facility to build, or use, the C extension, just by running: python setup.py install My experience is limited, but I see two possible cases: User does not have MS Visual Studio, or the GCC compiler suite, installed on their machine, to build the C extension User is running IronPython, Jython, or anything other than CPython. I only have used CPython. So I'm not sure how I could distribute this module so that it would work smoothly and be easy to install on those platforms, if they're unable to use the C extension.

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• Ruby on Rails: having two xmlbuilder templates per action , one for errors one for regular output

  - by randombits

  What's the best way to handle having two templates (or should it be one, DRY?) for xml builder templates? I'm building a web api with Rails and wanted to see an example of how to have a view that does regular output vs one that does error output. I've been using @obj.to_xml for a while, but my requirements have changed and require me building my own error templates. do you typically have both views in one with a condition above for errors such as app/views/myresource/create.xml.builder unless @myobj.errors.empty? // xml for errors here? end // regular xml view

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• Excel tab sheet names vs. Visual Basic sheet names

  - by SteveNeedsSheetNames

  It seems that Visual Basic can not reference sheets according to user-modified sheet names. The worksheet tabs can have their names changed, but it seems that Visual Basic still thinks of the worksheet names as Sheet1, etc., despite the workbook tab having been changed to something useful. I have this: TABname = rng.Worksheet.Name ' Excel sheet TAB name, not VSB Sheetx name. Thanks, Bill Gates. but I would like to use sheet names in Visual Basic routines. The best I could come up so far is to Select Case the Worksheet Tab vs. Visual Basic names, which doesn't make my day. Visual Basic must know the Sheet1, Sheet2, etc., names. How can I get these associated with the Excel tab names so that I don't have to maintain a look-up table which changes with each new sheet or sheet tab re-naming? Thanks in advance for your replies.

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• jQuery UI Autocomplete - style like a standard <SELECT>

  - by jkohlhepp

  I'm on the verge of starting a new web application that is likely to have need for both standard, simple dropdowns as well as more feature-rich autocomplete controls for longer lists of values, better type ahead behavior, etc. I'm planning on using the jQuery UI Autocomplete widget along with some combobox behavior as detailed here: http://jqueryui.com/demos/autocomplete/#combobox My concern is that "out of the box" the Autocomplete widget looks very different than a standard control. Since is not easy to skin/style, I'm hoping to adjust the Autocomplete to look & feel as close to the as possible, except in the cases where the increased functionality justifies a different L&F. What is the best way to go about reskinning the Autocomplete to look more like a ? Has this already been done somewhere? Should I use jQuery UI theming? Other options?

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• Add 2 values to 1 key in a PHP array

  - by Mike Munroe

  I have a result set of data that I want to write to an array in php. Here is my sample data: **Name** **Abbrev** Mike M Tom T Jim J Using that data, I want to create an array in php that is of the following: 1|Mike|M 2|Tom|T 3|Jim|j I tried array_push($values, 'name', 'abbreviation') [pseudo code], which gave me the following: 1|Mike 2|M 3|Tom 4|T 5|Jim 6|J I need to do a look up against this array to get the same key value, if I look up "Mike" or "M". What is the best way to write my result set into an array as set above where name and abbreviation share the same key?

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• Good IDE for Mono on Windows

  - by Paja

  I would like to develop Mono application for Win/Linux/Mac in C# on Windows. Is there any really good (Visual Studio comparable) IDE for that? The best would be if I could manage Visual C# Express to compile solutions using the Mono compiler. I've found a #develop IDE, which looks very cool and has many features that Express edition of the Visual Studio hasn't (like plugins for TortoiseSVN, NUnit, etc). Hovewer the 3.* versions dropped support for Mono, so you are no longer able to compile solutions using the Mono compiler. There is also a MonoDevelop. I've tried it and it sucks. Not comparable to Visual Studio at all. No WinForms designer, + tons of other missing features. I would just like if they would drop the development of MonoDevelop and build a plugin for #develop instead. Is there any other good enough IDE, or is it possible to make the Visual C# Express or #develop compile the solutions with Mono compiler?

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• Creating settings like the Mail settings in the Settings app

  - by cannyboy

  I want to create some settings much like the Mail settings within the Settings app. These allow you to add mail accounts to the end of the table First screen --------------- + | add account | --------------- When they click on the cell, they are pushed onto a new screen where they fill in a few textfields Second screen ----------------- |(cancel) (save)| - the toolbar ----------------- ---------------- | email | ---------------- |another field | ---------------- Then when they go back, they can see the new record as well as the 'add account' cell. First screen --------------- | email 1 | --------------- + | add account | --------------- It need to be in-app rather than within the Settings app. What's the best way to do this?

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• Creating settings like the Mail settings in the Settings app

  - by cannyboy

  I want to create some settings much like the Mail settings within the Settings app. These allow you to add mail accounts to the end of the table First screen --------------- + | add account | --------------- When they click on the cell, they are pushed onto a new screen where they fill in a few textfields Second screen ----------------- |(cancel) (save)| - the toolbar ----------------- ---------------- | email | ---------------- |another field | ---------------- Then when they go back, they can see the new record as well as the 'add account' cell. First screen --------------- | email 1 | --------------- + | add account | --------------- It need to be in-app rather than within the Settings app. What's the best way to do this?

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• Rails cookie session sharing and "www.example.com" or "example.com" problem

  - by Rafael Mueller

  When people access my app on www.example.com and log in, they get a cookie. I'm using the cookie option to store session on Rails. Accessing example.com (without the www), they must log in again, because Firefox does not recognize the previous session. So, what do you think is the best way to avoid this? I guess I will use a small .htaccess rule (Apache + Passenger) like this: RewriteEngine on RewriteCond %{HTTP_HOST} ^example\.com RewriteRule ^(.*)$ http://www.example.com/$1 [R=permanent,L] Do you guys think that is a good solution?

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• What is the difference in WCF when using KnownType and ServiceKnownType?

  - by Paul Speranza

  I have a service that returns an array of animal but the list can contain cats, dogs, etc, which all extend animal. I know I need to use either the KnownType or ServiceKnownType attribute, and on the entity class or the service class, respectively. What is the difference between the 2 attributes? I prefer the ServiceKnownType because it is applied on the service, exactly where it is needed and called for, as opposed to KnownType which is applied on my entity. To me applying it on the entity class means knowing too far ahead how my entity class is being used. For now I have it on my entity and it works like a charm, but I am looking for guidance here as to best practices and usefullness. Thanks, Paul Speranza

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