Resume capability in download of the file in iPhone

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I am using following code to resume a downloading

-(void) downloadFileAtURLPath:(NSString*)URLpath filename:(NSString *)filename
{
    NSLog(@"Getting %@", URLpath);
    NSURL *myURL = [[NSURL alloc] initWithString:URLpath];

    NSMutableURLRequest *req;
    req = [NSMutableURLRequest requestWithURL:myURL
                                  cachePolicy:NSURLRequestUseProtocolCachePolicy
                              timeoutInterval:30.0];

    if (![NSURLConnection canHandleRequest:req])
    {}

    if (downloadingConnection != nil)
    {
        [self.downloadingConnection cancel];
         downloadingConnection = nil;
    }

    NSFileManager *manager = [NSFileManager defaultManager];
    fileName = filename;//[[NSString alloc] initWithString:[URLpath lastPathComponent]];

    NSString *directoryPath = [self createDirectory:APP_NAME];
    NSString *dirPath    = [directoryPath stringByAppendingPathComponent:fileName];

    long long downloadedBytes = 0;
    if ([manager fileExistsAtPath:dirPath])
    {
        NSError *error = nil;
        NSDictionary *fileDictionary = [manager attributesOfItemAtPath:dirPath
                                                                 error:&error];
        if (!error && fileDictionary)
            downloadedBytes = [fileDictionary fileSize];
    }
    else
    {
        [manager createFileAtPath:dirPath contents:nil attributes:nil];
    }

    if (downloadedBytes > 0)
    {
        NSString *requestRange = [NSString stringWithFormat:@"bytes=%lld-", downloadedBytes];
        [req setValue:requestRange forHTTPHeaderField:@"Range"];
    }

    self.dataLengthOfWholeConnection = 0;
    self.dataWrittenForWholeConnection = 0;

     self.downloadingConnection = [NSURLConnection connectionWithRequest:req delegate:self];
    [self.downloadingConnection start];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
    if (![httpResponse isKindOfClass:[NSHTTPURLResponse class]])
    {
        // I don't know what kind of request this is!
        return;
    }

    self.dataLengthOfWholeConnection = [response expectedContentLength];

    NSString *directoryPath = [self createDirectory:APP_NAME];
    NSString *dirPath    = [directoryPath stringByAppendingPathComponent:fileName];

    NSFileHandle *fh = [NSFileHandle fileHandleForWritingAtPath:dirPath];
    self.fileHandle = fh;

    switch (httpResponse.statusCode)
    {

        case 206:
        {
            NSString *range = [httpResponse.allHeaderFields valueForKey:@"Content-Range"];
            NSError *error = nil;
            NSRegularExpression *regex = nil;

            // Check to see if the server returned a valid byte-range
            regex = [NSRegularExpression regularExpressionWithPattern:@"bytes (\\d+)-\\d+/\\d+"
                                                              options:NSRegularExpressionCaseInsensitive
                                                                error:&error];
            if (error)
            {
                isValid = NO;
                [fh truncateFileAtOffset:0];
                break;
            }

            // If the regex didn't match the number of bytes, start the download from the beginning
            NSTextCheckingResult *match = [regex firstMatchInString:range
                                                            options:NSMatchingAnchored
                                                              range:NSMakeRange(0, range.length)];
            if (match.numberOfRanges < 2)
            {
                [fh truncateFileAtOffset:0];
                isValid = YES;
                break;
            }

            // Extract the byte offset the server reported to us, and truncate our
            // file if it is starting us at "0".  Otherwise, seek our file to the
            // appropriate offset.
            NSString *byteStr = [range substringWithRange:[match rangeAtIndex:1]];
            NSInteger bytes = [byteStr integerValue];
            if (bytes <= 0)
            {
                //[fh truncateFileAtOffset:0];
                break;
            }
            else
            {
                isValid = YES;
                self.dataWrittenForWholeConnection = bytes;
                self.dataLengthOfWholeConnection += bytes;
                [fh seekToFileOffset:bytes];
            }
            break;
        }

        default:
            if (dataLengthOfWholeConnection <= 0)
            {
                isValid = NO;
            }
            else
            {
                isValid = YES;
                [fh truncateFileAtOffset:0];
            }
            break;
    }
}

Problem is its not resuming the download. With range i am STILL getting httpResponse.statusCode 200 status instead of 206. WHAT is wrong?

i AM Using a tinyurl link

asked 1 min ago

Muhammad Umar

2,722

Resume capability in download of the file in iPhone