iPhone: Downloading zip and extracting in main bundle subdirectory at runtime

Question

I want to extend my iPhone app that the app downloads a zip file into a sub directory then extracts it and then load images which were inside the zip.

Any ideas how to unzip in run-time and the access the images? Would be really happy for some idea.

Greetings,

Answer 1

I've used ZipArchive with success in the past.

It's pretty ligthweight and simple to use, supports password protection, multiple files inside a ZIP, as well as compress & decompress.

The basic usage is:

NSString *filepath = [[NSBundle mainBundle] pathForResource:@"ZipFileName" ofType:@"zip"];
ZipArchive *zipArchive = [[ZipArchive alloc] init];
[zipArchive UnzipOpenFile:filepath Password:@"xxxxxx"];
[zipArchive UnzipFileTo:{pathToDirectory} overWrite:YES];
[zipArchive UnzipCloseFile];
[zipArchive release];

Answer 2

You cannot extract into your bundle. Use [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] to get the path to a directory you can write to.

You can use the code from http://code.google.com/p/ziparchive/ to extract files from the zip archive.