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Besides the basics of reading and writing files, Cocoa provides a number of classes that let you deal with files in ways similar to how the Finder deals with files. You can get access to file-system attributes, get the file s icon, see which application will open this file by default, and more. The rest of this chapter will explore some of these capabilities in the context of a new application called What About That File (see Figure 15 1). This application lets the user choose a file, at which point some information about the file is shown, as well as the file s contents in the form of a string. If the file contains data that can t be represented as a character string, it will tell the user so. Otherwise, the user can use an included popup list to change the text encoding that is used when reading the file from disk, and show the resulting string.

1 Make sure you are working in the same file from the last exercise 2 Select the first keyframe of the actions layer and open the Actions panel by

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Start in Xcode. Make a new Cocoa application (no Document support or Core Data this time) named WhatAboutThatFile, and do the usual steps of enabling garbage collection and creating a WhatAboutThatFileAppDelegate class if Xcode didn t create one for you. In previous chapters, we ve assembled applications one step at a time, but now that we re this far along, we think you re ready to take on bigger chunks of application code. So this time, what we re going to do to is present the complete code of the application, with some commentary interspersed, and then describe how to wire up everything in Interface Builder using Cocoa Bindings. For starters, here s the header file of our app delegate, which declares a few instance variables and a larger number of properties, used for accessing values through Cocoa Bindings:

pressing F9 (Windows) or OPTION-F9 (Mac)

@interface WhatAboutThatFileAppDelegate : NSObject { NSFileWrapper *fileWrapper; NSString *filePath; NSStringEncoding chosenEncoding; } @property (retain) NSFileWrapper *fileWrapper; @property (retain) NSString *filePath; @property (readonly) NSDictionary *fileAttributes; @property (readonly) NSString *filename; @property (readonly) NSImage *fileIcon; @property (readonly) NSImage *opensAppIcon; @property (readonly) NSString *opensAppName; @property (assign) NSString *stringEncodingName; @property (readonly) NSString *fileStringValue; @property (readonly) NSDictionary *encodingNames; @property (assign) NSStringEncoding chosenEncoding; - (IBAction)chooseFile:(id)sender; @end

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variable called rotateAmt, with a data type of Number and a value of 30 This will represent the amount of rotation to apply to the minute hand when it rotates Your code should match the code that follows (new code is bold):

Now let s move on to the .m file:

// DECLARE VARIABLES AND CREATE OBJECTS var rotateAmt:Number = 30;

#import "WhatAboutThatFileAppDelegate.h" @implementation WhatAboutThatFileAppDelegate @synthesize fileWrapper, filePath, chosenEncoding; - (void)applicationDidFinishLaunching:(NSNotification *)n { fileWrapper = nil; filePath = nil; }

The number 30 is not some random number, but rather a calculation of 360 divided by 12 Why 360 divided by 12 One goal for this game is to make the minute hand move only five minutes at a time The number 12 comes from 60 (the number of minutes in an hour) divided by 5 (the amount of minutes to move) 360 comes from a full circle having 360 degrees 360 divided by 12 represents the rotation amount that will show five minutes on the clock

.

The chooseFile: method uses the NSOpenPanel class to ask the user to choose a file to inspect. If the user actually picks a file, we set all of our instance variables based on the selection. chosenEncoding, a variable of type NSStringEncoding (which is at heart simply an unsigned integer) is set to 0, which is not a valid string encoding type, so that at a later stage we can let the system try to deduce the string encoding type for us. After that, we set filePath based on the selection in the open panel, and finally set fileWrapper, which is an instance of the NSFileWrapper class, which simply wraps a file and lets us get some metadata about it, based on the value of filePath.

Array and a value of [tl_btn, tr_btn, br_btn, bl_btn] This array will hold all the buttons, and you ll use it to create loops that run a block of code on all the buttons

- (IBAction)chooseFile:(id)sender { NSOpenPanel *openPanel = [NSOpenPanel openPanel]; [openPanel setCanChooseFiles:YES]; [openPanel setCanChooseDirectories:NO]; [openPanel setResolvesAliases:NO]; [openPanel setAllowsMultipleSelection:NO]; if ([openPanel runModal] == NSFileHandlingPanelOKButton) { self.chosenEncoding = 0; self.filePath = [[openPanel filenames] lastObject]; self.fileWrapper = [[[NSFileWrapper alloc] initWithPath:filePath] autorelease]; } }

// DECLARE VARIABLES AND CREATE OBJECTS var rotateAmt:Number = 30; var buttons:Array = [tl_btn, tr_btn, br_btn, bl_btn];

Next, we have the filename and fileIcon methods, which will be read by the uppermost GUI objects in our window. Note that this reading occurs via Cocoa Bindings, so we use

5 Below the code you just wrote, create a variable called currentButtonNum,

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