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• Convert charset name to NSStringEncoding

  - by d11wtq

  Given a charset string, such as "utf-8", "iso-8859-1", "us-ascii" etc, is there any built-in way to get the appropriate NSStringEncoding in Cocoa? Right now I'm looking at just building a NSDictionary containing a canonicalized version of the name mapped to the NSStringEncoding, then having a lookup mechanism that canonicalizes the input in the same way. But is there really no way to get NSUTF8StringEncoding given the string "UTF-8", etc?

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• Do I need getters and setters if i'm depending on garbage collection in objective-c

  - by Chris

  New to Cocoa and Objective-c. Do I need getters and setters if I'm depending on garbage collection? For example is it safe to just modify instance variables directly without the dot syntax? And in the dealloc method can I sent them to nil instead of release (or do I even have to release them)?

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• Writing Custom Menubar Extra

  - by Tristan Seifert

  How can I make a Menu Extra like the Battery Meter in Cocoa? I can make a Status Item, but they are not movable.

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• Objective C -std=c99 usage

  - by Andy White

  Is there any reason why you shouldn't use the "-std=c99" flag for compiling Objective-C programs on Mac? The one feature in C99 that I really like is the ability to declare variables anywhere in code, rather than just at the top of methods, but does this flag causes any problems or create incompatibilities for iPhone or Cocoa apps?

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• PayPal Objective-C API?

  - by MegaEduX

  Is there any PayPal Objective-C (Cocoa) API? Or if there's not, is there any way to communicate with PayPal to get like current PayPal balance, etc? Was thinking in doing a mac PayPal app, more for personal use. Thanks in advance.

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• How can I obtain raw data from a CVImageBuffer object.

  - by jslap

  Hi, I'm trying to use cocoa to grab images from a webcam. I'm able to get the image in RGBA format using the QTKit and the didOutputVideoFrame delegate call, and converting the CVImageBuffer to a CIImage and then to a NSBitmapImageRep. I know my camera grabs natively in YUV, what I want is to get the YUV data directly from the CVImageBuffer, and proccess the YUV frame before displaying it. My question is: How can I get the YUV data from the CVImageBuffer? thanks.

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• NSUInteger vs NSInteger, int vs unsigned, and similar cases

  - by Jesse Armand

  Anyone have the expertise to explain when to use NSUInteger and when to use NSInteger? I had seen Cocoa methods returning NSInteger even in cases where the returned value will always be unsigned. What is the fundamental reason? Is NSInteger or int strictly limited to if we want to represent negative value?

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• Learn C first before learning Objective-C

  - by Lark

  Being an aspiring Apple developer, I want to get the opinions of the community if it is better to learn C first before moving into Objective-C and ultimately the Cocoa Framework? My gut says learn C, which will give me a good foundation.

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• Build an Xcode project on a Linux machine

  - by d11wtq

  Without writing a GNUmakefile by hand, do any tools exist that understand Xcode projects and can build then directly against GNUstep, thus simplifying (slightly) the work required to keep projects functional under Cocoa/Mac and GNUstep/Linux? Basically, is there an xcodebuild style app for Linux? I looked at pbtomake a few weeks ago but it seems to be a dead project.

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• NSApplication orderFrontStandardAboutPanel: Making my about panel slightly less standard

  - by anthony

  What are my options, if any, of adding additional, arbitrary data to the standard Cocoa about dialog that is displayed by an NSApplication when it receives a orderFrontStandardAboutPanel message.

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• How can I parse raw email source and extract the HTML part?

  - by Matthew Brindley

  In my iPhone app, I'm handed the raw source of an email, in RFC822 (or "eml") format. I'd like the HTML part of this message (if one exists). Rather than attempting to parse it out myself and converting escape chars and so on, I thought I'd check to see if anyone knows of an objective-c library to do this for me. In .NET, I've always used the Mailbee classes for anything email related, but I can't seem to find anything similar for cocoa.

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• What's the Best Way to Shuffle an NSMutableArray?

  - by Kristopher Johnson

  If you have an NSMutableArray, how do you shuffle the elements randomly? (I have my own answer for this, which is posted below, but I'm new to Cocoa and I'm interested to know if there is a better way.)

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• quartz composer view output: How can I get immediately the new values of outputs, if they change?

  - by Flocked

  Hello, I created a cocoa program with a quartz composer view. I can get the output values with: [qcView valueForOutputKey:@"Output"] But how can I get immediately the new values of outputs, if they change?

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• How to share information across controllers?

  - by Steffen

  Hi everybody, I recently started programming my first Cocoa app. I have ran into a problem i hope you can help me with. I have a MainController who controls the user browsing his computer and sets some textfield = the chosen folder. I need to retrieve that chosen folder in my AnalyzeController in order to do some work. How do i pass the textfield objectValue from the MainController to the AnalyzeController? Thanks

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• Bring NSRunAlertPanel to Front in Background Process

  - by mon4goos

  If you call NSRunAlertPanel() from a background process in Cocoa, the dialogue does not come to the front and instead stays behind other windows. This post (http://stackoverflow.com/questions/2639479/nsrunalertpanel-shows-up-behind-the-active-window) shows that you can bring the dialogue to the front if you convert the process to a foreground process. If you keep the process a background process, however, is there any way to achieve this behavior?

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• How can you update an NSMenu while it is active (visible)?

  - by Alexsander Akers

  I have an NSMenu instance, through which all communication with the Cocoa app will take place. If the menu is open, the background doesn't run, so how can I force an update while the menu is still active?

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• NSWindowController windowDidLoad not called

  - by user288024

  I have a simple Cocoa app using a NSWindowController subclass. In the nib I have set: File Owner's class to my NSWindowController subclass The 'Window' outlet of the File's Owner to the main NSWindow in the nib. The init method of my NSWindowController subclass is called (I call super), but not matter what I do windowDidLoad is never called. I must be missing something obvious, but for the life of me I can't figure out what it is.

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• How can I animate a content switch in an NSImageView?

  - by Alexsander Akers

  I want to switch the image shown in an NSImageView, but I want to animate that change. I've tried various methods to do this. Hopefully one of you could suggest one that might actually work. I'm working with Cocoa for Mac.

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• Is it possible to do some interop with iWork?

  - by Alerty

  I know it is possible with the .NET framework of Microsoft to do some interoperability with Microsoft Office. Is there something that exist that resembles to it for iWork and the Cocoa framework? Edit: Here are more details. I would like to create an application that has a GUI and that can generate Pages/Keynote/Numbers documents.

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• allocing an object based on a string name

  - by Roger Gilbrat

  Is there a way in objective-c/Cocoa to alloc an object when the class name isn't know until run-time. I seem to remember something about this a while ago, but can't find anything on it now. Something like: [[@"MyClass" alloc] init]; I seem to recall a function that would return some kind of class id based on a string that can then be used to alloc the object.

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• How would one make an Xcode style console window?

  - by iaefai

  I am making a Haskell editor with Cocoa, and it would be useful to support some in-application text output. Even better would be supporting some text input. Xcode does all this in its console, which looks like it might be an NSTextView, but not sure if somebody might have done all this before.

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• UIEvent has timestamp. How can I generate an equivalent value on my own?

  - by Dave Peck

  According to the cocoa documentation, timestamp on UIEvent is "the number of seconds since system startup." It's an NSTimeInterval. I'd like to generate, as efficiently as possible, an equivalent number. Of course, I want to do this where UIEvent don't shine. :-)

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• how to get NSTextField in custom NSFormatter class

  - by Amit

  i am new to cocoa and objective-c and creating small application having few NStextFields on the window.I have create custom NSformatter to validate the inputs,at some instance i want to get the NStextField within my custom NSformatter to change its backcolor to red to notify user for wrong input value.I didn't getting how to get the currently selected/focused NStextfield for which i want to change backcolor.

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• Bring NSRunAlertPanel Dialogue to Front in Background Process

  - by mon4goos

  If you call NSRunAlertPanel() from a background process in Cocoa, the dialogue does not come to the front and instead stays behind other windows. This post shows that you can bring the dialogue to the front if you convert the process to a foreground process. If you keep the process a background process, however, is there any way to achieve this behavior?

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• Can I write native iPhone apps using Python

  - by DavidM

  Using PyObjC, you can use Python to write Cocoa applications for OS X. Can I write native iPhone apps using Python and if so, how?

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