ASIDownloadCache

#import "ViewController.h"

#import "ASIHTTPRequest.h"
#import "ASIDownloadCache.h"
#import "ASICacheDelegate.h"
@interface ViewController ()<ASIHTTPRequestDelegate>
{
ASIDownloadCache *_downloadCache;
ASIHTTPRequest *reqst;
ASIHTTPRequest * r;
}
@end

@implementation ViewController

-(NSString *)cachePath
{
NSArray *documents=NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
return [[documents objectAtIndex:0]stringByAppendingPathComponent:@"MyCache"];
}
- (void)viewDidLoad
{
[super viewDidLoad];

_downloadCache=[ASIDownloadCache sharedCache];

reqst=[ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://img.my.csdn.net/uploads/201301/15/1358253228_2924.png"] usingCache:_downloadCache];
[reqst setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
[reqst setDownloadCache:_downloadCache];

reqst.delegate=self;
[reqst startAsynchronous];

}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (void)dealloc {
[_imageView release];
[super dealloc];
}
#pragma mark -
#pragma mark - ASIHttpRequest methods
-(void)requestFinished:(ASIHTTPRequest *)request
{
if ([request didUseCachedResponse])
{
NSLog(@"from cache");
}else
{
NSLog(@"from net");
}
NSLog(@"str %@",request.responseCookies);
if (request==r)
{
self.imageView.image=[UIImage imageWithData:request.responseData];
}
//self.imageView.image=[UIImage imageWithData:request.responseData];
}
-(void)requestFailed:(ASIHTTPRequest *)request
{
NSLog(@"failed");
}
- (IBAction)Button:(id)sender {

r=[ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://img.my.csdn.net/uploads/201301/15/1358253228_2924.png"] usingCache:_downloadCache];
r.delegate=self;
[r startAsynchronous];
}
@end

// Cache storage policies control whether cached data persists between application launches (ASICachePermanentlyCacheStoragePolicy) or not (ASICacheForSessionDurationCacheStoragePolicy)

// Cache policies control the behaviour of a cache and how requests use the cache
// When setting a cache policy, you can use a combination of these values as a bitmask
// For example: [request setCachePolicy:ASIAskServerIfModifiedCachePolicy|ASIFallbackToCacheIfLoadFailsCachePolicy|ASIDoNotWriteToCacheCachePolicy];
// Note that some of the behaviours below are mutally exclusive - you cannot combine ASIAskServerIfModifiedWhenStaleCachePolicy and ASIAskServerIfModifiedCachePolicy, for example.