NSURLConnection Download File

代码http://blog.csdn.net/qim/archive/2009/09/24/4589236.aspx

 

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URLDownload *downloader;  
- (IBAction) download:(id)sender {  
    [urlField resignFirstResponder];  
    NSString *tmpPath = [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];  
    NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:[urlField text]]];  
 
    downloader = [[URLDownload alloc] initWithRequest:req directory:tmpPath delegate:self];  
}  
 
///////////////////////////////////////////////////////////////////////  
//URLDownloadDelegate implements  
- (void)downloadDidFinish:(URLDownload *)download {  
    LOG(download.filePath);  
    [self releaseDownloader];  
}  
 
- (void)download:(URLDownload *)download didCancelBecauseOf:(NSException *)exception {  
    UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"" message:[exception reason] delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK",nil] autorelease];  
    [alert show];  
    [self releaseDownloader];  
}  
 
- (void)download:(URLDownload *)download didFailWithError:(NSError *)error {  
    UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"" message:[error localizedDescription] delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK",nil] autorelease];  
    [alert show];  
    [self releaseDownloader];  
}  
 
- (void)download:(URLDownload *)download didReceiveDataOfLength:(NSUInteger)length {  
} 
URLDownload *downloader;
- (IBAction) download:(id)sender {
 [urlField resignFirstResponder];
 NSString *tmpPath = [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];
 NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:[urlField text]]];

 downloader = [[URLDownload alloc] initWithRequest:req directory:tmpPath delegate:self];
}

///////////////////////////////////////////////////////////////////////
//URLDownloadDelegate implements
- (void)downloadDidFinish:(URLDownload *)download {
 LOG(download.filePath);
 [self releaseDownloader];
}

- (void)download:(URLDownload *)download didCancelBecauseOf:(NSException *)exception {
 UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"" message:[exception reason] delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK",nil] autorelease];
 [alert show];
 [self releaseDownloader];
}

- (void)download:(URLDownload *)download didFailWithError:(NSError *)error {
 UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"" message:[error localizedDescription] delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK",nil] autorelease];
 [alert show];
 [self releaseDownloader];
}

- (void)download:(URLDownload *)download didReceiveDataOfLength:(NSUInteger)length {
}
 

URLDownload.h

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#import <Foundation/Foundation.h>  
 
@class URLDownload;  
 
@protocol URLDownloadDeleagte  
- (void)downloadDidFinish:(URLDownload *)download;  
- (void)download:(URLDownload *)download didCancelBecauseOf:(NSException *)exception;  
- (void)download:(URLDownload *)download didFailWithError:(NSError *)error;  
@optional  
- (void)download:(URLDownload *)download didReceiveDataOfLength:(NSUInteger)length;  
- (void)download:(URLDownload *)download didReceiveResponse:(NSURLResponse *)response;  
 
@end  
 
@interface URLDownload : NSObject {  
    id <URLDownloadDeleagte, NSObject> delegate;  
    NSString *directoryPath;  
    NSString *filePath;  
    NSURLRequest *request;  
    NSFileHandle *file;  
    NSURLConnection *con;  
}  
@property(readonly) NSString *filePath;  
 
- (id)initWithRequest:(NSURLRequest *)req directory:(NSString *)dir delegate:(id<URLDownloadDeleagte, NSObject>)dg;  
- (void)dealloc;  
- (void)cancel;  
 
// NSURLConnection delegate  
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;  
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;  
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;  
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;  
//- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;  
//- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;  
//- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse;  
//- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse;  
 
@end 
#import <Foundation/Foundation.h>

@class URLDownload;

@protocol URLDownloadDeleagte
- (void)downloadDidFinish:(URLDownload *)download;
- (void)download:(URLDownload *)download didCancelBecauseOf:(NSException *)exception;
- (void)download:(URLDownload *)download didFailWithError:(NSError *)error;
@optional
- (void)download:(URLDownload *)download didReceiveDataOfLength:(NSUInteger)length;
- (void)download:(URLDownload *)download didReceiveResponse:(NSURLResponse *)response;

@end

@interface URLDownload : NSObject {
 id <URLDownloadDeleagte, NSObject> delegate;
 NSString *directoryPath;
 NSString *filePath;
 NSURLRequest *request;
 NSFileHandle *file;
 NSURLConnection *con;
}
@property(readonly) NSString *filePath;

- (id)initWithRequest:(NSURLRequest *)req directory:(NSString *)dir delegate:(id<URLDownloadDeleagte, NSObject>)dg;
- (void)dealloc;
- (void)cancel;

// NSURLConnection delegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;
//- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
//- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
//- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse;
//- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse;

@end
 

 URLDownload.m

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#import "URLDownload.h"  
 
 
@implementation URLDownload  
@synthesize filePath;  
 
- (id)initWithRequest:(NSURLRequest *)req directory:(NSString *)dir delegate:(id<URLDownloadDeleagte, NSObject>)dg {  
    if (self = [super init]) {  
        request = [req retain];  
        directoryPath = [dir retain];  
        delegate = [dg retain];  
          
        con = [[NSURLConnection alloc] initWithRequest:request delegate:self];  
    }  
    return self;  
}  
 
- (void)dealloc {  
    [request release];  
    [directoryPath release];  
    [filePath release];  
    [file release];  
    [delegate release];  
    [con release];  
    [super dealloc];  
}  
 
- (void)cancel {  
    [con cancel];  
}  
 
// NSURLConnection delegate  
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {  
    filePath = [[response suggestedFilename] retain];  
    if ([delegate respondsToSelector:@selector(download: didReceiveResponse:)])  
        [delegate download:self didReceiveResponse:response];  
}  
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {  
    LOG([error localizedDescription]);  
    if ([delegate respondsToSelector:@selector(download: didFailWithError:)])  
        [delegate download:self didFailWithError:error];  
}  
 
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {  
    @try {  
        if (file == nil) {  
            NSFileManager *fm = [NSFileManager defaultManager];  
            BOOL isDir;  
            if (![fm fileExistsAtPath:directoryPath isDirectory:&isDir]) {  
                NSError *error;  
                if (![fm createDirectoryAtPath:directoryPath withIntermediateDirectories:YES attributes:nil error:&error]) {  
                    LOG([error localizedDescription]);  
                    LOG([error localizedFailureReason]);  
                    LOG([error localizedRecoverySuggestion]);  
                    [NSException raise:@"Exception" format:[error localizedDescription]];  
                }  
            } else if (!isDir) {  
                [NSException raise:@"Exception" format:@"Failed to create directory at %@, because there is a file already.", directoryPath];  
            }  
            NSString *tmpFilePath = [[directoryPath stringByAppendingPathComponent:filePath] stringByStandardizingPath];  
            int suffix = 0;  
            while ([fm fileExistsAtPath:tmpFilePath]) {  
                suffix++;  
                tmpFilePath = [[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@%d", filePath, suffix]] stringByStandardizingPath];  
            }  
            [fm createFileAtPath:tmpFilePath contents:[NSData data] attributes:nil];  
            [filePath release];  
            filePath = [tmpFilePath retain];  
              
            file = [[NSFileHandle fileHandleForWritingAtPath:filePath] retain];  
        }  
        [file writeData:data];  
        if ([delegate respondsToSelector:@selector(download: didReceiveDataOfLength:)])  
            [delegate download:self didReceiveDataOfLength:[data length]];  
    }  
    @catch (NSException * e) {  
        LOG([e reason]);  
        [connection cancel];  
        [delegate download:self didCancelBecauseOf:e];  
    }  
}  
 
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {  
    [delegate downloadDidFinish:self];  
}  
/* 
 
 - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge; 
 - (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge; 
 - (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse; 
 - (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse; 
*/ 
   
@end 

 

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