ASIHTTPRequest实现断点下载

 1  - (IBAction)URLFetchWithProgress:(id)sender
 2 {
 3      [startButton setTitle:@"Stop" forState:UIControlStateNormal];
 4      [startButton addTarget:self action:@selector(stopURLFetchWithProgress:)

              forControlEvents:UIControlEventTouchUpInside];
 5      NSString *tempFile = [[[[NSBundle mainBundle] 

             bundlePath]stringByDeletingLastPathComponent]

             stringByAppendingPathComponent:@"MemexTrails_1.0b1.zip.download"];
 6      if ([[NSFileManager defaultManager] fileExistsAtPath:tempFile]) 

        {
 7           [[NSFileManager defaultManager] removeItemAtPath:tempFile error:nil];
 8      }
 9  
10      [self resumeURLFetchWithProgress:self];
11 }
12 
13 - (IBAction)stopURLFetchWithProgress:(id)sender
14 {
15      networkQueue = [[ASINetworkQueue alloc] init];
16      timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self   

              selector:@selector(updateBandwidthUsageIndicator) 

              userInfo:nil repeats:YES];
17      timer = nil;
18      [startButton setTitle:@"Stop" forState:UIControlStateNormal];
19      [startButton addTarget:self action:@selector(URLFetchWithProgress:)

              forControlEvents:UIControlEventTouchUpInside];
20      [networkQueue cancelAllOperations];
21      [resumeButton setEnabled:YES];
22 }
23 
24 - (IBAction)resumeURLFetchWithProgress:(id)sender 
25 {
26     [resumeButton setEnabled:NO];
27     [startButton setTitle:@"Start" forState:UIControlStateNormal];
28     [startButton addTarget:self action:@selector(stopURLFetchWithProgress:)

             forControlEvents:UIControlEventTouchUpInside];
29     [networkQueue cancelAllOperations];
30     [networkQueue setShowAccurateProgress:YES];
31     [networkQueue setDownloadProgressDelegate:progressIndicator];
32     [networkQueue setDelegate:self];
33     [networkQueue setRequestDidFinishSelector:

             @selector(URLFetchWithProgressComplete:)];
34  
35      ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] 

             initWithURL:[NSURLURLWithString:

             @"http://9991.net/blog/mp3/2.mp3"]] autorelease];
36     [request setDownloadDestinationPath:[[[[NSBundle mainBundle]

             bundlePath]stringByDeletingLastPathComponent]

             stringByAppendingPathComponent:@"MemexTrails_1.0b1.mp3"]];

37     [request setTemporaryFileDownloadPath:[[[[NSBundle mainBundle] 

             bundlePath]stringByDeletingLastPathComponent]

             stringByAppendingPathComponent:@"MemexTrails_1.0b1.zip.down"]];
38     [request setAllowResumeForFileDownloads:YES];
39     [networkQueue addOperation:request];
40     [networkQueue go];
41 }
42 
43 - (void)URLFetchWithProgressComplete:(ASIHTTPRequest *)request
44 {
45     if ([request error]) {
46           fileLocation.text=[NSString stringWithFormat:@"An error occurred: %@",

                   [[[requesterror] userInfo] objectForKey:@"Title"]];
47     }

       else {
48           fileLocation.text=[NSString stringWithFormat:

                     @"File downloaded to %@",[requestdownloadDestinationPath]];
49    }
50          [startButton setTitle:@"Start" forState:UIControlStateNormal];
51          [startButton addTarget:self action:@selector(URLFetchWithProgress:)

             forControlEvents:UIControlEventTouchUpInside];
52 }
53 
54 - (IBAction)throttleBandwidth:(id)sender
55 {
56      if ([(UIButton *)sender state] ==YES) 

        {
57          [ASIHTTPRequest setMaxBandwidthPerSecond:ASIWWANBandwidthThrottleAmount];
58      } 

         else {
59          [ASIHTTPRequest setMaxBandwidthPerSecond:0];
60      }
61 }