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Instead of using a regular C array in Car, let s use an NSMutableArray. Why Because that will give us bounds checking for free. To do this, we ll change the @interface section of the Car class to use a mutable array (the changed line of code is in bold):

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- (void) deletePhoto: (NSInteger) photoID { const char * sql = "delete from photos where id = "; sqlite3_stmt *delete_statement = nil; NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString * docsDir = [paths objectAtIndex:0]; NSString * thePath = [docsDir stringByAppendingPathComponent: @"myDatabasesqlite"]; sqlite3_open([thePath UTF8String], &database); sqlite3_prepare_v2(database, sql, -1, &delete_statement, NULL); sqlite3_bind_int(delete_statement, 1, photoID); sqlite3_step(delete_statement); sqlite3_finalize(delete_statement); sqlite3_close(database); }

#import <Cocoa/Cocoa.h> @class Tire; @class Engine;

3 Create a new IBAction called deletePhoto to MyDBProjectViewController (Listing 16-21)

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Listing 16-21

@interface Car : NSObject { NSMutableArray *tires; Engine *engine; } - (void) setEngine: (Engine *) newEngine; - (Engine *) engine; - (void) setTire: (Tire *) tire atIndex: (int) index; - (Tire *) tireAtIndex: (int) index; - (void) print; @end // Car

- (IBAction) deletePhoto : (id) sender { PhotosDAO * myPhotos = [[PhotosDAO alloc] init]; [myPhotos deletePhoto:currentID]; [selfphotos release]; selfphotos = [myPhotos getAllPhotos]; currentElement = 0; [myPhotos release]; }

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We ve upgraded pretty much every method of Car to follow the memory management rules. Let s start with init:

20% 120%

(continued)

4 Move the static NSInteger currentElement from the changeImage method in Listing 16-11

- (id) init { if (self = [super init]) { tires = [[NSMutableArray alloc] init]; int i; for (i = 0; i < 4; i++) { [tires addObject: [NSNull null]]; } } return (self); } // init

to just below the currentID variable (Listing 16-22) Remove the static qualifier Listing 16-22 Placing currentElement at the class s top so it s shared in the class

050% 300% 300% 1118%

You ve seen self = [super init] a bajillion times already; you ve practically memorized it. As you know by now, it just makes sure that the superclass gets the object up and running. Next, we create an NSMutableArray. There s a handy NSMutableArray method called

@implementation MyDBProjectViewController @synthesize photos; @synthesize theImageView; @synthesize theLabel; NSInteger currentID = 0; NSInteger currentElement = 0; 5 Save your changes and open MyDBProjectViewControllerxib 6 Add another button to the toolbar and change its title to Delete 7 Resize the image and move the label to above the toolbar, as you are running out of space

replaceObjectAtIndex:withObject: that s perfect for implementing setTire:atIndex:.

on the toolbar (Figure 16-9)

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16:

To use replaceObjectAtIndex:withObject:, we need to have an object at the given index so it can be replaced. A fresh NSMutableArray doesn t have any contents, so we need some object as a placeholder. NSNull is great for that kind of thing. So, we put four NSNull objects

The delete statement follows the same pattern as insert and update The only real difference is the SQL string

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you can pass an autoreleased NSData instead without worrying about cleaning it up. Here is an NSData object that will hold an ordinary C string, which is just a sequence of bytes, and print out the data:

const char * sql = "delete from photos where id = ";

const char *string = "Hi there, this is a C string!"; NSData *data = [NSData dataWithBytes: string length: strlen(string) + 1]; NSLog (@"data is %@", data);

Summary

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