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.