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  • Cocoa JSON - Check whether array or dictionary

    - by Craig
    Hi, I am using the Cocoa JSON framework ( http://code.google.com/p/json-framework/ ) to communicate with an API. The problem is that the API returns a dictionary if there is an error but returns an array of the results if it works. Is there a good way to detect if the JSONValue is an array or a dictionary? Thanks.

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  • GHC.Generics and Type Families

    - by jberryman
    This is a question related to my module here, and is simplified a bit. It's also related to this previous question, in which I oversimplified my problem and didn't get the answer I was looking for. I hope this isn't too specific, and please change the title if you can think if a better one. Background My module uses a concurrent chan, split into a read side and write side. I use a special class with an associated type synonym to support polymorphic channel "joins": {-# LANGUAGE TypeFamilies #-} class Sources s where type Joined s newJoinedChan :: IO (s, Messages (Joined s)) -- NOT EXPORTED --output and input sides of channel: data Messages a -- NOT EXPORTED data Mailbox a instance Sources (Mailbox a) where type Joined (Mailbox a) = a newJoinedChan = undefined instance (Sources a, Sources b)=> Sources (a,b) where type Joined (a,b) = (Joined a, Joined b) newJoinedChan = undefined -- and so on for tuples of 3,4,5... The code above allows us to do this kind of thing: example = do (mb , msgsA) <- newJoinedChan ((mb1, mb2), msgsB) <- newJoinedChan --say that: msgsA, msgsB :: Messages (Int,Int) --and: mb :: Mailbox (Int,Int) -- mb1,mb2 :: Mailbox Int We have a recursive action called a Behavior that we can run on the messages we pull out of the "read" end of the channel: newtype Behavior a = Behavior (a -> IO (Behavior a)) runBehaviorOn :: Behavior a -> Messages a -> IO () -- NOT EXPORTED This would allow us to run a Behavior (Int,Int) on either of msgsA or msgsB, where in the second case both Ints in the tuple it receives actually came through separate Mailboxes. This is all tied together for the user in the exposed spawn function spawn :: (Sources s) => Behavior (Joined s) -> IO s ...which calls newJoinedChan and runBehaviorOn, and returns the input Sources. What I'd like to do I'd like users to be able to create a Behavior of arbitrary product type (not just tuples) , so for instance we could run a Behavior (Pair Int Int) on the example Messages above. I'd like to do this with GHC.Generics while still having a polymorphic Sources, but can't manage to make it work. spawn :: (Sources s, Generic (Joined s), Rep (Joined s) ~ ??) => Behavior (Joined s) -> IO s The parts of the above example that are actually exposed in the API are the fst of the newJoinedChan action, and Behaviors, so an acceptable solution can modify one or all of runBehaviorOn or the snd of newJoinedChan. I'll also be extending the API above to support sums (not implemented yet) like Behavior (Either a b) so I hoped GHC.Generics would work for me. Questions Is there a way I can extend the API above to support arbitrary Generic a=> Behavior a? If not using GHC's Generics, are there other ways I can get the API I want with minimal end-user pain (i.e. they just have to add a deriving clause to their type)?

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  • jar to python module

    - by iamrohitbanga
    I am using an API which provides a Java version but not a Python version. I can switch to Java as right now I am only prototyping. but is there a quick way to convert the functionality of API packaged in a jar to a python module?

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  • How to determine whether a spread-sheet cell contains a date, or a real number?

    - by Everyone
    When a cell in a spreadsheet contains a simple date (mm/dd/yyyy) the poi API flags the cell-type as 'numeric'. This is probably because spreadsheets ( IMO ) historically recognize only strings and real numbers. It is possible to hard-code the cell-index, and use it conditionally to call 'getDateCellValue'. But this feels like a hack. What other ways are there in the poi API to determine whether the content in a cell is a Date rather than a real number?

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  • How to convert pdf to utf-8

    - by Apple
    I am trying to upload a pdf file using webservice api. But this api doesnot work for pdf file. it works fine for text file.when i try to upload a pdf file it give error as Client-SOAP-ERROR: Encoding: string '%PDF-1.4 %\xc7...' is not a valid utf-8 string So can we convert this pdf file into utf8 string. i am using php as a scripting language.

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  • Circular database relationships. Good, Bad, Exceptions?

    - by jim
    I have been putting off developing this part of my app for sometime purely because I want to do this in a circular way but get the feeling its a bad idea from what I remember my lecturers telling me back in school. I have a design for an order system, ignoring the everything that doesn't pertain to this example I'm left with: CreditCard Customer Order I want it so that, Customers can have credit cards (0-n) Customers have orders (1-n) Orders have one customer(1-1) Orders have one credit card(1-1) Credit cards can have one customer(1-1) (unique ids so we can ignore uniqueness of cc number, husband/wife may share cc instances ect) Basically the last part is where the issue shows up, sometimes credit cards are declined and they wish to use a different one, this needs to update which their 'current' card is but this can only change the current card used for that order, not the other orders the customer may have on disk. Effectively this creates a circular design between the three tables. Possible solutions: Either Create the circular design, give references: cc ref to order, customer ref to cc customer ref to order or customer ref to cc customer ref to order create new table that references all three table ids and put unique on the order so that only one cc may be current to that order at any time Essentially both model the same design but translate differently, I am liking the latter option best at this point in time because it seems less circular and more central. (If that even makes sense) My questions are, What if any are the pros and cons of each? What is the pitfalls of circular relationships/dependancies? Is this a valid exception to the rule? Is there any reason I should pick the former over the latter? Thanks and let me know if there is anything you need clarified/explained. --Update/Edit-- I have noticed an error in the requirements I stated. Basically dropped the ball when trying to simplify things for SO. There is another table there for Payments which adds another layer. The catch, Orders can have multiple payments, with the possibility of using different credit cards. (if you really want to know even other forms of payment). Stating this here because I think the underlying issue is still the same and this only really adds another layer of complexity.

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  • SimpleMembership updating the "isconfirmed" flag

    - by Vijay V
    My Users table (the one that I created) has the following columns: UserId,UserName,FirstName,LastName,DOB After I ran this command WebSecurity.InitializeDatabaseConnection("DefaultConnection", "Users", "UserId", "UserName", autoCreateTables: true); it created the required simple membership tables for me. How would I go about "UnConfirming" an user or setting the "IsConfirmed" flag to false in the webpages_Membership using the new SimpleMembership API? (Earlier, before going to simplemembership using the "Membership" class I could update an user using the api call : Membership.UpdateUser( user );)

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  • QT widget for on WindowsXP

    - by Surjya Narayana Padhi
    Hi Geeks, I need to create a widget which shows battery status(in percentage) inside my qt application. Can anybody suggest me how to get the winXP api to know the battery status. Then as the api will return the percentage I will display on my widget....

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  • Windows Designer host, Control.Parent is not correct

    - by nils_gate
    In my Windows Designer host implementation, The top Control's Control.Controls does have all the child controls but for Child control's Control.Parent is set to {System.Windows.Forms.Design.DesignerFrame+OverlayControl} Am I doing something wrong? How to find who is the actual parent of the control while in design mode?

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  • Has anyone tried the "objectify" library for Google App Engine?

    - by Spines
    I was using JDO for my google app engine project but got fed up with the additional 5 seconds it adds to my cold start time. I was planning on just writing stuff directly to the database with the low level datastore api, but then I came accross the objectify project ( http://code.google.com/p/objectify-appengine/ ). Apparently its a super light wrapper above the low level api. Does anyone have experiences with this library that they could share?

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  • PHP ucwords(): Uppercase the first character of each word in a string accept 'and', 'to', etc

    - by lauthiamkok
    hi, How can I make upper-case the first character of each word in a string accept a couple of words which I don't want to transform them, like - and, to, etc? For instance, I want this - ucwords('art and design') to output the string below, 'Art and Design' is it possible to be like - strip_tags($text, '<p><a>') which we allow and in the string? or I should use something else? please advise! thanks.

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  • Show or hide elements in PDF via Javascript

    - by Boldewyn
    In PDF files it is quite easy to interact with form fields via the Javascript API. Is it possible to do this (specifically showing/hiding) to arbitrary elements on a page? Say, not just form fields, but text, graphical elements, embedded images... Is there an API to interact with those? If yes, how do I identify an object?

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  • In Android OS or Java, what's the difference between a character sequence and a string????

    - by K-RAN
    For the API (Android SDK API version 8) functions whose definitions list character sequence parameters, I can feed the function String instead. Best part is that they work the same way, no hassle, no warnings. Is there a difference between the two types? And more importantly, is there an inherent danger if I send the function a String instead of a character sequence??? Thanks for any clarifications!!! :D

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  • Cannot run the Map Example

    - by Tsimmi
    Hi! I'm trying to run the google maps example but it keep giving me in the console: "WARNING: Application does not specify an API level requirement!" "Device API version is 7 (Android 2.1)" The application never starts, instead, it shows that frame with: "The application (...) has stopped unexpectedly..." Can Anyone point what might be the the problem? Thanks

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  • Twitter rate limit

    - by raulriera
    Hi, I am whitelisted in Twitter, and I have this "traffic heavy" application that just makes 2 request to find out how many users 2 people have.... the traffic currently is killing the 150 request limit per hour. How do I authenticate my requests so that twitter knows I am whitelisted? http://api.twitter.com/1/users/show.xml?screen_name=chavezcandanga http://api.twitter.com/1/users/show.xml?screen_name=luischataing I wish to authenticate those for this simple project http://250mil.com Thanks!

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  • Rails time zones

    - by Bob
    I'm calling an external web service API that returns a timezone as listed in the Olson timezones database (e.g. "America/New_York"). However some of the values the API returned are "US/Pacific", "US/Eastern" and apparently don't match any of the Olson timezones in Rails 2.3.2. Can anyone shed some light on this? Thanks in advance for your help.

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  • Start to Finish Advanced Project Tutorials

    - by Ronnie Overby
    Can anyone recommend some start to finish project tutorials that really emphasize good design principles and best practices. I am looking for things that demonstrate and emphasize any or all of these: Domain Driven Design Unit Testing Inversion of Control Separation of Concerns Use of interfaces Object Relational Mapping Preferably ASP.NET MVC I am currently watching the Autumn of Agile series, which demonstrates many of these principles. I would like to find more of these tutorials/demos.

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  • ExtJS Close button on each tab in a Tabpanel

    - by Poul
    The Extjs API site adds a new tab for each search you do. The tabs each have a red X on them to close the tab similar to what browsers have. Check it out here: I'd like to replicate this and it seems like something that would be built-in to the API, but cannot find it. Any ideas?

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  • How to keep form's focus in VB.net??

    - by phiru
    In VB, i use SetWindowPos API. It makes form on top of other windows, but the form lost focus. so, i use mouse_event API. I force the position of mouse to click somewhere in the form. Anyways, I need any help to keep form on top and its focus of other windows.

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