How can I convert NSDictionary to NSData and vice versa

Question

I am sending NSString and UIImage using bluetooth  I decided to store both in a NSDictionary and then convert the dictionary to NSData   My question is how to convert NSDictionary to NSData and visa versa

User · Answer

NSDictionary from NSData  http   www cocoanetics com 2009 09 nsdictionary-from-nsdata   NSDictionary to NSData  You can use NSPropertyListSerialization class for that  Have a look at its method      NSData   dataFromPropertyList  id plist format  NSPropertyListFormat format                               errorDescription  NSString    errorString   Returns an NSData object containing a given property list in a specified format

User · Answer

Please try this one  NSError  error  NSDictionary  responseJson    NSJSONSerialization JSONObjectWithData webData                                 options NSJSONReadingMutableContainers                                 error  amp error

User · Answer

Use NSJSONSerialization    NSDictionary  dict  NSData  dataFromDict    NSJSONSerialization dataWithJSONObject dict                                                        options NSJSONWritingPrettyPrinted                                                          error  amp error    NSDictionary  dictFromData    NSJSONSerialization JSONObjectWithData dataFromDict                                                              options NSJSONReadingAllowFragments                                                                error  amp error     The latest returns id  so its a good idea to check the returned object type after you cast  here i casted to NSDictionary

User · Answer

NSDictionary -  NSData   NSMutableData  data     NSMutableData alloc  init   NSKeyedArchiver  archiver     NSKeyedArchiver alloc  initForWritingWithMutableData data    archiver encodeObject yourDictionary forKey   Some Key Value     archiver finishEncoding    archiver release       Here  data holds the serialized version of your dictionary    do what you need to do with it before you   data release     NSData -  NSDictionary  NSData  data     NSMutableData alloc  initWithContentsOfFile  self dataFilePath    NSKeyedUnarchiver  unarchiver     NSKeyedUnarchiver alloc  initForReadingWithData data   NSDictionary  myDictionary     unarchiver decodeObjectForKey   Some Key Value   retain    unarchiver finishDecoding    unarchiver release    data release     You can do that with any class that conforms to NSCoding   source

User · Answer

In Swift 2 you can do it in this way   var dictionary  NSDictionary           NSDictionary to NSData    let data   NSKeyedArchiver archivedDataWithRootObject dictionary      NSData to NSDictionary    let unarchivedDictionary   NSKeyedUnarchiver unarchiveObjectWithData data   as  NSDictionary   In Swift 3      NSDictionary to NSData    let data   NSKeyedArchiver archivedData withRootObject  dictionary      NSData to NSDictionary    let unarchivedDictionary   NSKeyedUnarchiver unarchiveObject with  data

User · Answer

NSDictionary -  NSData    NSData  myData    NSKeyedArchiver archivedDataWithRootObject myDictionary     NSData -  NSDictionary   NSDictionary  myDictionary    NSDictionary    NSKeyedUnarchiver unarchiveObjectWithData myData

[iphone] How can I convert NSDictionary to NSData and vice versa?

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