Goal: download a zipped file, unzip it, and save it in the iPhone app's Documents directory.

The following code makes use of the initWithGzippedData method that was added to NSData in the Molecule app found here: http://www.sunsetlakesoftware.com/molecules

As adapted to my app:

NSString *sFolder = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSString *sFileName = [sFolder stringByAppendingPathComponent:@"MyFile.db"]; NSURL *oURL = [NSURL URLWithString: @"http://www.isystant.com/Files/MyFile.zip"]; NSData *oZipData = [NSData dataWithContentsOfURL: oURL]; NSData *oData = [[NSData alloc] initWithGzippedData:oZipData]; [oZipData release]; b = [oData writeToFile:sFileName atomically:NO]; NSLog(@"Unzip %i", b);

Result: A zip file is successfully downloaded. From it a new, supposedly unzipped file is created in the Documents directory with the desired name (MyFile.db) but it has zero bytes.

Anybody see the problem? Or else is there a simpler way to unzip a downloaded file than the one used in the Molecules app?