Swift: Read and write binary data (cookies) to disk? - file

Question

Specifically I want the command line utility to write the data from NSHTTPCookieStorage.sharedHTTPCookieStorage().cookies to a file and then read the data so I can later call NSHTTPCookieStorage.sharedHTTPCookieStorage().setCookie()
Here's the code I have so far.
if (Process.arguments.count >= 2 && Process.arguments[1] == "-deleteAll") {
for cookie in NSHTTPCookieStorage.sharedHTTPCookieStorage().cookies! {
NSHTTPCookieStorage.sharedHTTPCookieStorage().deleteCookie(cookie as NSHTTPCookie)
}
} else if (Process.arguments.count >= 3 && Process.arguments[1] == "-restore") {
println("restore from file: " + Process.arguments[2])
} else if (Process.arguments.count >= 3 && Process.arguments[1] == "-export") {
println("export to file: " + Process.arguments[2])
}
The lines
for cookie in NSHTTPCookieStorage.sharedHTTPCookieStorage().cookies! {
cookie.writeToFile("/Users/aaron/Documents/test.txt", options: nil, error: nil)
}
give me an error:
2014-12-30 20:20:46.564 Test[17423:424845] -[NSHTTPCookie writeToFile:options:error:]: unrecognized selector sent to instance 0x100511260
2014-12-30 20:20:46.579 Test[17423:424845] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSHTTPCookie writeToFile:options:error:]: unrecognized selector sent to instance 0x100511260'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff950fc64c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff97e556de objc_exception_throw + 43
2 CoreFoundation 0x00007fff950ff6bd -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x00007fff95046a84 ___forwarding___ + 1028
4 CoreFoundation 0x00007fff950465f8 _CF_forwarding_prep_0 + 120
5 Test 0x00000001001caa1f top_level_code + 991
6 Test 0x00000001001caa9a main + 42
7 libdyld.dylib 0x00007fff918fd5c9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I guess this is under the category of writing generic data to disk.