URL Loading System Programming Guide - Apple Developer

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Using NSURLDownload Resuming Downloads Resuming Downloads In some cases, you can resume a download that was canceled or that failed while in progress. To do so, first make sure your original download doesn’t delete its data upon failure by passing NO to the download’s setDeletesFileUponFailure: method. If the original download fails, you can obtain its data with the resumeData method. You can then initialize a new download with the initWithResumeData:delegate:path: method. When the download resumes, the download’s delegate receives the download:willResumeWithResponse:fromByte: message. You can resume a download only if both the protocol of the connection and the MIME type of the file being downloaded support resuming. You can determine whether your file’s MIME type is supported with the canResumeDownloadDecodedWithEncodingMIMEType: method. Decoding Encoded Files NSURLDownload provides support for decoding the MacBinary, BinHex, and gzip file formats. If NSURLDownload determines that a file is encoded in a supported format, it attempts to send the delegate a download:shouldDecodeSourceDataOfMIMEType: message. If the delegate implements this method, it should examine the passed MIME type and return YES if the file should be decoded. The example in Listing 3-5 compares the MIME type of the file and allows decoding of MacBinary and BinHex encoded content. Listing 3-5 Example implementation of download:shouldDecodeSourceDataOfMIMEType: method - (BOOL)download:(NSURLDownload *)download shouldDecodeSourceDataOfMIMEType:(NSString *)encodingType { BOOL shouldDecode = NO; if ([encodingType isEqual:@"application/macbinary"]) { shouldDecode = YES; } else if ([encodingType isEqual:@"application/binhex"]) { shouldDecode = YES; } else if ([encodingType isEqual:@"application/x-gzip"]) { shouldDecode = NO; } return shouldDecode; 2013-10-22 | Copyright © 2003, 2013 Apple Inc. All Rights Reserved. 46
Using NSURLDownload Decoding Encoded Files } 2013-10-22 | Copyright © 2003, 2013 Apple Inc. All Rights Reserved. 47
Page 1 and 2: URL Loading System Programming Guid
Page 3 and 4: Contents Making a POST Request 36 R
Page 5 and 6: Listings Understanding Cache Access
Page 7 and 8: About the URL Loading System At a G
Page 13 and 14: About the URL Loading System How to
Page 15 and 16: Using NSURLSession The NSURLSession
Page 17 and 18: Using NSURLSession Understanding UR
Page 19 and 20: Using NSURLSession Creating and Con
Page 21 and 22: Using NSURLSession Creating and Con
Page 23 and 24: Using NSURLSession Fetching Data Us
Page 25 and 26: Using NSURLSession Downloading File
Page 27 and 28: Using NSURLSession Uploading Body C
Page 29 and 30: Using NSURLSession Handling iOS Bac
Page 31 and 32: Using NSURLSession Handling iOS Bac
Page 33 and 34: Using NSURLConnection Creating a Co
Page 35 and 36: Using NSURLConnection Creating a Co
Page 37 and 38: Using NSURLConnection Making a POST
Page 39 and 40: Using NSURLConnection Retrieving Da
Page 41 and 42: Using NSURLDownload Downloading to
Page 43 and 44: Using NSURLDownload Downloading a F
Page 45: Using NSURLDownload Displaying Down
Page 49 and 50: Encoding URL Data CFStringRef decod
Page 51 and 52: Handling Redirects and Other Reques
Page 53 and 54: Authentication Challenges and TLS C
Page 59 and 60: Understanding Cache Access Cache Us
Page 61 and 62: Understanding Cache Access Controll
Page 63 and 64: Cookies and Custom Protocols Protoc
Page 65 and 66: Life Cycle of a URL Session Life Cy
Page 71 and 72: Document Revision History Date 2003

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