unzipping a file in cocoa - cocoa

Question

I have a zipped file, which i want to extract the contents of it. What is the exact procedure that i should do to achieve it. Is there any framework to unzip the files in cocoa framework or objective C.

Answer 1

If you are on iOS or don't want to use NSTask or whatever, I recommend my library SSZipArchive.
Usage:
NSString *path = #"path_to_your_zip_file";
NSString *destination = #"path_to_the_folder_where_you_want_it_unzipped";
[SSZipArchive unzipFileAtPath:path toDestination:destination];
Pretty simple.

Answer 2

On the Mac you can use the built in unzip command line tool using an NSTask:
- (void) unzip {
NSFileManager* fm = [NSFileManager defaultManager];
NSString* zipPath = #"myFile.zip";
NSString* targetFolder = #"/tmp/unzipped"; //this it the parent folder
//where your zip's content
//goes to (must exist)
//create a new empty folder (unzipping will fail if any
//of the payload files already exist at the target location)
[fm createDirectoryAtPath:targetFolder withIntermediateDirectories:NO
attributes:nil error:NULL];
//now create a unzip-task
NSArray *arguments = [NSArray arrayWithObject:zipPath];
NSTask *unzipTask = [[NSTask alloc] init];
[unzipTask setLaunchPath:#"/usr/bin/unzip"];
[unzipTask setCurrentDirectoryPath:targetFolder];
[unzipTask setArguments:arguments];
[unzipTask launch];
[unzipTask waitUntilExit]; //remove this to start the task concurrently
}
That is a quick and dirty solution. In real life you will probably want to do more error checking and have a look at the unzip manpage for fancy arguments.

Answer 3

Here's a Swift 4 version similar to Sven Driemecker's answer.
func unzipFile(at sourcePath: String, to destinationPath: String) -> Bool {
let process = Process.launchedProcess(launchPath: "/usr/bin/unzip", arguments: ["-o", sourcePath, "-d", destinationPath])
process.waitUntilExit()
return process.terminationStatus <= 1
}
This implementation returns a boolean that determines if the process was successful or not. Is considering the process successful even if warnings were encountered.
The return condition can be changed to return process.terminationStatus == 0 to not even accept warnings.
See unzip docs for more details on diagnostics.
You can also capture the output of the process using a Pipe instance.
func unzipFile(at sourcePath: String, to destinationPath: String) -> Bool {
let process = Process()
let pipe = Pipe()
process.executableURL = URL(fileURLWithPath: "/usr/bin/unzip")
process.arguments = ["-o", sourcePath, "-d", destinationPath]
process.standardOutput = pipe
do {
try process.run()
} catch {
return false
}
let resultData = pipe.fileHandleForReading.readDataToEndOfFile()
let result = String (data: resultData, encoding: .utf8) ?? ""
print(result)
return process.terminationStatus <= 1
}

Answer 4

If you just want to unzip the file, I would recommend using NSTask to call unzip(1). It's probably smart to copy the file to a directory you control -- probably in /tmp -- before unzipping.

Answer 5

Here's a more concise version based on codingFriend1's approach
+ (void)unzip {
NSString *targetFolder = #"/tmp/unzipped";
NSString* zipPath = #"/path/to/my.zip";
NSTask *task = [NSTask launchedTaskWithLaunchPath:#"/usr/bin/unzip" arguments:#[#"-o", zipPath, #"-d", targetFolder]];
[task waitUntilExit];
}
-d specifies the destination directory, which will be created by unzip if not existent
-o tells unzip to overwrite existing files (but not to deleted outdated files, so be aware)
There's no error checking and stuff, but it's an easy and quick solution.

Answer 6

Try Zip.framework.

Answer 7

-openFile: (NSWorkspace) is the easiest way I know.