downloader.m

TTR的一个经典游戏

#import <CoreFoundation/CoreFoundation.h>
#import <Foundation/Foundation.h>
#import <UIKit/CDStructures.h>
#import <UIKit/UIWindow.h>
#import <UIKit/UIView-Hierarchy.h>
#import <UIKit/UIHardware.h>
#import <UIKit/UIKit.h>
#import <UIKit/UIApplication.h>
#import <UIKit/UITextView.h>
#import <UIKit/UIView.h>
#import <UIKit/UIKeyboard.h>
#import <UIKit/UIBox.h>

#import <Celestial/AVItem.h>
#import <Celestial/AVController.h>
#import <Celestial/AVQueue.h>


#import "Downloader.h"

@implementation Downloader

+ (id) downloadURL: (NSString *)url to: (NSString *)filename app: (UIApplication *) app trigger: (NSString *) trig {
	return [[Downloader alloc] initWithDownloadURL: url savingToFile: filename app: app trigger: trig];
}

- (id) initWithDownloadURL: (NSString *)u savingToFile: (NSString *)f app: (UIApplication *) a trigger: (NSString *) t {
	NSLog(@"Downloader begins: downloading\n\t%@\nto:\n\t%@", u, f);
	url = [u retain];
	file = [f retain];
	app = a;
	trig = t;
	nsurl = [[NSURL URLWithString: u] retain];
	failed = finished = NO;
	data = [[NSMutableData dataWithCapacity: 100000] retain];
	expectedBytes = loadedBytes = 0;
	[nsurl loadResourceDataNotifyingClient: self usingCache: YES];
	return self;
}

- (float) getProgress {
	if (expectedBytes == 0) return 0;
	return (float)loadedBytes / (float)expectedBytes;
}

- (BOOL) finished {
	return finished;
}

- (BOOL) failed {
	return failed;
}

- (void)URL:(NSURL *)sender resourceDataDidBecomeAvailable:(NSData *)newBytes {
	NSLog(@"Downloader got %d bytes", [newBytes length]);
	[data appendData: newBytes];
	loadedBytes = [data length];
}

- (void)URL:(NSURL *)sender resourceDidFailLoadingWithReason:(NSString *)reason{
	failed = YES;
	finished = YES;
	[app triggerButton: trig];
}

- (void)URLResourceDidCancelLoading:(NSURL *)sender{
	failed = YES;
	finished = YES;
	[app triggerButton: trig];
}

- (void)URLResourceDidFinishLoading:(NSURL *)sender{
	NSLog(@"Downloader finished");
	[data writeToFile: file atomically: NO];
	finished = YES;
	[app triggerButton: trig];
}

@end