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• How to write a value validation method for core data?

  - by mystify

  The docs say: you should implement methods of the form validate:error:, as defined by the NSKeyValueCoding protocol so lets say I have an attribute which is an int: friendAge I want to make sure that any friend may not be younger than 30. So how would I make that validation method? -validateFriendAge:error: What am I gonna do in there,…

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• StreamSocket to Stream in windows phone 8

  - by Abouzar Nouri

  I am trying to use Bluetooth in WP8 to send an image from my app on a device and show it in my app on another device. The receiver has a StreamSocket object to read the data from it like the code below await _dataReader.LoadAsync(4); uint messageLen = (uint)_dataReader.ReadInt32(); await _dataReader.LoadAsync(messageLen); string imageData…

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• What exactly are those data types int 16, int 32 and int 64 on the iPhone, in Core Data?

  - by mystify

  The Xcode data modeler shows me those three different int data types. When I would write code, which data types do these really correspond to on the iPhone? Are they all simply NSInteger, wrapped in an NSNumber? As far as I see it, NSNumber only differentiates between int an NSInteger... so I guess those three end up beeing pretty much…

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• What's does "cardinality of an relationship" mean in Core Data?

  - by dontWatchMyProfile

  From the docs: If all of a managed object's relationship delete rules are Nullify, then for that object at least there is no additional work to do (you may have to consider other objects that were at the destination of the relationship—if the inverse relationship was either mandatory or had a lower limit on …

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• How to transfer Core Data store from provisioned iPhone to iPhone simulator?

  - by Jason

  I have a lot of data stores in my app on my provisioned device, and I want to do additional testing on my computer which is much faster than using the device. What is the best way to transfer the data store into the iPhone simulator so I can access it on the computer?

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• Which kind of changes can't I do with lightweight migration in Core Data?

  - by dontWatchMyProfile

  I recently tried a lot of different stuff with lightweight migration. These all work: 1) Rename attributes (with renaming identifier specified) 2) Add attributes 3) Add new entity + new attribute + inverse relationship to an already existing entity 4) remove existing entity + relationships to that entity = It almost…

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• Most performant way to check how many objects are referenced by an to-many relationship in Core Data

  - by dontWatchMyProfile

  Lets say I have an employees relationship in an Company entity, and it's to-many. And they're really many. Apple in 100 years, with 1.258.500.073 employees. Could I simply do something like NSInteger numEmployees = [apple.employees count]; without firing 1.258.500.073 faults? (Well, in 100 years, the iPhone will…

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• Does Core Data take appropriate action automatically when there's a Low Memory Warning?

  - by dontWatchMyProfile

  Does it turn some managed objects into faults when there's a Low Memory Warning? Or must we do that manually by calling the -refreshObjects:mergeChanges: method which puts the affected managed objects on diet quickly? And...would that actually hurt? What if these objects are currently used by an…

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• Core Animation cross-dissolve between one string (or image) and another when changing bound value?

  - by danwood

  I have an NSTextView and an NSImageView that is bound to a NSString and an NSImage in my code. I would like to have the displayed string and image cross-dissolve when I change the string and image in code. Any way to do this? Do I need to stop using bindings? (And if I do, is there any trick…

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• NSPredicate (Core Data fetch) to filter on an attribute value being present in a supplied set (list)

  - by starbaseweb

  I'm trying to create a fetch predicate that is the analog to the SQL "IN" statement, and the syntax to do so with NSPredicate escapes me. Here's what I have so far (the relevant excerpt from my fetching routine): NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];…

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• What's the consequence when Core Data detects an optimistic locking failure when trying to save?

  - by dontWatchMyProfile

  I get it: When a managed object context saves, the snapshots of all edited objects are compared against the values in the persistent store to see if the PS has changed since the snapshot was made. If it did change, then there's a conflict and optimistic locking failed, according to…

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• WebDav issue with Mac OS X 10.5.3 onwards

  - by svnr

  Hi, We upgraded to Mac OS X 10.5.3 and getting problem when uploading files (PUT) to a webdav server (the server is Apache running on a Windows environment). When we drag and drop on to a webdav folder using Finder we get a -36 error. When looking at the stack trace of the web…

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• WebDav issue with Mac OS X 10.5.3 onwards

  - by svnr

  We upgraded to Mac OS X 10.5.3 and getting problem when uploading files (PUT) to a webdav server (the server is Apache running on a Windows environment). When we drag and drop on to a webdav folder using Finder we get a -36 error. When looking at the stack trace of the web…

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• F# Powerpack's Metadata doesn't recognize FSharp.Core as an F# library

  - by Nathan Sanders

  Here's my test code to isolate the problem: open Microsoft.FSharp.Metadata [<EntryPoint>] let main args = let core = FSharpAssembly.FromFile @"C:\Program Files\FSharp-2.0.0.0\\bin\FSharp.Core.dll" let core2 = FSharpAssembly.FSharpLibrary let core3 =…

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• How to view iPhone on computer over bluetooth or usb [closed]

  - by user25785

  Hello, I heard this is an app that you can install on your computer and iPhone that will allow you to see your iPhone on your computer. Kinda like remoting desktop to your iPhone. So essentially you can type a text message with your normal keyboard, also screen…

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• Intel i7 vs Xeon quad core processor?

  - by jasondavis

  I know the Xeon processors have been around for a long time and are mostly used in servers but I am curious, why do people not use the xeon's in a high performance desktop? As far as I know about the best desktop processor out there now is the i7 line. The…

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• Share a USB sound card over a network/bluetooth (Mac & PC)

  - by AlexW

  I've been wondering how I can stream audio to an external Edirol USB sound card, wirelessly, on both Mac and PC. I'm not looking for high quality transmission, just to play mp3s from my Mac laptop to a USB sound card that is attached to two very nice…

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• Testifying rasing net.core.somaxconn can make a difference

  - by petermolnar

  I got into an argument on the net.core.somaxconn parameter: I was told that it will not make any difference if we change the default 128. I believed this might be enough proof: "If the backlog argument is greater than the value in…

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• Upgrading from single core to dual core - Will throughput get doubled ?

  - by S.Man

  If i replace a single-core processor with a dual-core processor, Will it increase the throughput by two times ? If No, why throughput does not get doubled ?

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• sms using bluetooth com port connection guidance

  - by user287745

  Mobile phone AT & T guidance? i connect my china/ and nokia phone using bluetooth COM PORT CONNECTION it say com at 5, i would like to use this connection to send and receive sms using c#. please guide, resources, example code.…

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• bluetooth application devlopment

  - by krishna

  i want to devlop bluetooth(c/c++) applications in linx can any one help me how to and where to start ? can any one one provide me proper tutorial ??

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• Locating "Add Bluetooth Device" 's exe location

  - by Jayesh

  Hi, I was keen on using the Process class [C#] to open "Add Bluetooth Device" wizard, but I was wondering what is the location of the wizard's exe? I would be glad if someone can help. Thanks

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• iPod Touch (OS 3.0) bluetooth connection to non apple device

  - by Avi

  I need to know if I can programmatically connect my iPod Touch (OS 3.0) to a non apple blue tooth device, Using the Apple iPhone SDK. I know that I can connect to other iPhone using GameKit API, But can I connect to other non apple…

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• Is it possible to activate bluetooth from code

  - by SWATI

  hey in my application i have to give user an option called "BLUETOOTH" Is it possible that i can put it ON or OFF from my code i have no idea.... Am i doing right or just trying to do unnecessary work

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• How can I roll back xserver-xorg-core and xserver-common?

  - by Ville Sundberg

  A recent update to Xorg broke my desktop, which now looks like this: http://i.imgur.com/PbBxh.jpg In short, the desktop background is not updating on the secondary display. (And if there is no secondary display, the primary…

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