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POUsing iOS Dropbox SDK to do a Chunked Upload of Core Data
 

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    <p>I have an iOS app that uses Core Data for persistent data storage. I integrated Dropbox as a way for users to perform a a backup of the persistent store file (appname.sqlite).</p> <p>A UIButton calls a method to see if a file already exists on Dropbox:</p> <pre><code> if([[DBSession sharedSession]isLinked]) { NSString *folderName = [[self.dateFormatter stringFromDate:[NSDate date]] stringByReplacingOccurrencesOfString:@"/" withString:@"-"]; NSString *destinationPath = [NSString stringWithFormat:@"/GradeBook Pro/Backup/%@/",folderName]; self.metadataIndex = METADATA_REQUEST_BACKUP; [self.restClient loadMetadata:destinationPath]; } </code></pre> <p>The loadedMetadata delegate method initiates the upload with the rev number of the existing file (if one exists). </p> <pre><code>-(void) restClient:(DBRestClient *)client loadedMetadata:(DBMetadata *)metadata { SAVE_CORE_DATA; NSString *folderName = [[self.dateFormatter stringFromDate:[NSDate date]] stringByReplacingOccurrencesOfString:@"/" withString:@"-"]; NSString *documentsDirectory = DOCUMENTS_DIRECTORY; NSString *sourcePath = [NSString stringWithFormat:@"%@/GradeBookPro.sqlite", documentsDirectory]; NSString *destinationPath = [NSString stringWithFormat:@"/GradeBook Pro/Backup/%@/",folderName]; [self.restClient uploadFile:@"GradeBookPro.sqlite" toPath:destinationPath withParentRev:[[metadata.contents lastObject]rev] fromPath:sourcePath]; } </code></pre> <p>This works well for reasonably small files or large files over a perfect network connection but any small error during the upload cancels the whole process. I would like to switch to using the chunked upload methods but I'm at a loss as to how to actually do the 'chunking' of the .sqlite file.</p> <p>I can't seem to find any sample apps that are using the chunked upload that I can learn from and the documentation simply says to provide the file in chunks.</p> <p>So, my questions are:</p> <ol> <li><p>Is the chunked upload the right approach to addressing the user issues with uploading large files over a possibly spotty network connection?</p></li> <li><p>Can you point me to sample code / app / documentation for 'chunking' a file? I'm pretty comfortable with the Dropbox SDK.</p></li> </ol> <p>Thanks!</p>
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