How to list unknown files when unzipping in iOS? - ios

Question

I've started using ZipArchive because I have a testing app that displays images from a server where the content is often changing. I want the app to sort and display the images, without having an explicit list of the new image names. (Or maybe I should also include in the zipped file an XML document that contains the names of the new images.) Either way, I'm now having a problem adding a known image to the zip file on the server and finding it in the app.
The original zipfile.zip file has 2 files: photo.png and text.txt
That works. So I downloaded the zipfile.zip and uploaded it to my server. It still worked, of course.
Then I unzipped it, added a new image to it, and re-zipped it on my server.
The updated zipfile.zip now has 3 files: photo.png, myphoto.png, and text.txt
The image I added, myphoto.png, can't be found. What am I missing?
- (void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSURL *url = [NSURL URLWithString:#"http://www.icodeblog.com/wp-content/uploads/2012/08/zipfile.zip"];
NSError *error = nil;
NSData *data = [NSData dataWithContentsOfURL:url options:0 error:&error];
if(!error) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachePath = [paths objectAtIndex:0];
NSString *zipPath = [cachePath stringByAppendingPathComponent:#"zipfile.zip"];
[data writeToFile:zipPath options:0 error:&error];
if(!error) {
ZipArchive *za = [[ZipArchive alloc] init];
if ([za UnzipOpenFile: zipPath]) {
BOOL ret = [za UnzipFileTo: cachePath overWrite: YES];
if (NO == ret){
}
[za UnzipCloseFile];
// NSString *imageFilePath=[cachePath stringByAppendingPathComponent:#"photo.png"];
NSString *imageFilePath=[cachePath stringByAppendingPathComponent:#"myphoto.png"];
NSData *imageData = [NSData dataWithContentsOfFile:imageFilePath options:0 error:nil];
if (imageData) {
NSLog(#"found data");
} else {
NSLog(#"no data");
}
UIImage *img = [UIImage imageWithData:imageData];
NSString *textFilePath = [cachePath stringByAppendingPathComponent:#"text.txt"];
NSString *textString = [NSString stringWithContentsOfFile:textFilePath encoding:NSASCIIStringEncoding error:nil];
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = img;
self.label.text = textString;
});
}
} else {
NSLog(#"Error saving file %#",error);
}
} else {
NSLog(#"Error downloading zip file: %#", error);
}
});
}
When I run this, looking for the image I added, it returns "no data". Why? And the bigger question is: Can I, in my iOS app, list the contents of an unzipped file?
I started this project with this question which mention this code: SSZipArchive. It works well.

Answer 1

I've tested you code ... and is working fine for me...
The main change:
instead:
ZipArchive *za = [[ZipArchive alloc] init];
if ([za UnzipOpenFile: zipPath]) {
BOOL ret = [za UnzipFileTo: cachePath overWrite: YES];
if (NO == ret){
}
[za UnzipCloseFile];
I'm using
[SSZipArchive unzipFileAtPath:zipPath toDestination:cachePath];
You can list the content of a directory (after unzip):
NSArray * directoryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:cachePath error:&error];
NSLog(#"DIR folder : %#",directoryContents);
You can check here my demo project based on your code https://dl.dropboxusercontent.com/u/19438780/testSSZipArchive.zip
UPDATE
testing with my zip file I have:
(
"__MACOSX",
"Archive.zip",
"error feedly.txt",
"image1.jpg",
"image2.jpg",
"image3.jpg",
"image4.jpg",
"Tony-M.testSSZipArchive"
)