ピアツーピアで同時に文字列とNSDataを送信しますか？

Question

タイプ（String）のテキストフィールドとタイプ（NSData）のイメージを辞書に追加してピアに送ります。反対側では、キー値付きの文字列に辞書をデコードしていますペア。

辞書の画像データはもはやNSDataではなく文字列です。 文字列とデータを同時に送信し、文字列とデータとして取得するにはどうすればよいですか？

import MultipeerConnectivity 
import UIKit 


class ViewController: UIViewController, MCSessionDelegate, MCBrowserViewControllerDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate { 

var browser : MCBrowserViewController! 
var assistant : MCAdvertiserAssistant! 
var session : MCSession! 
var peerID: MCPeerID! 

var firstNameVar = "" 
var lastNameVar = "" 
var imageDataVar: NSData! 

let imagePicker = UIImagePickerController() 
var tapGestureID = Int() 

@IBOutlet weak var firstLame: UITextField! 
@IBOutlet weak var lastName: UITextField! 
@IBOutlet weak var firstNameLabel: UILabel! 
@IBOutlet weak var lastNameLabel: UILabel! 
@IBOutlet weak var contactImage: UIImageView! 

@IBAction func showBrowser(sender: UIButton) { 
    self.presentViewController(self.browser, animated: true, completion: nil) 
} 

@IBAction func getImage(sender: AnyObject) { 
    chooseImageContact() 
} 

@IBAction func sendChat(sender: AnyObject) { 
    sendInfo() 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 
    self.peerID = MCPeerID(displayName: UIDevice.currentDevice().name) 

    //self.session = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .Required) 
    self.session = MCSession(peer: self.peerID) 
    self.session.delegate = self 

    // create the browser viewcontroller with a unique service name 
    self.browser = MCBrowserViewController(serviceType: "LCOC-Chat", session: self.session) 
    self.browser.delegate = self 

    // tell the assistant to start advertising our fabulous chat 
    self.assistant = MCAdvertiserAssistant(serviceType:"LCOC-Chat", discoveryInfo:nil, session:self.session) 
    self.assistant.start() 
} 

func sendInfo() { 
    if self.session.connectedPeers.count > 0 { 
     firstNameVar = firstLame.text! 
     lastNameVar = lastName.text! 
     let myDictionary = ["itemA" : "\(firstNameVar)", "itemB" : "\(lastNameVar)", "itemC" : "\(imageDataVar)"] 
     do { 
     let data = NSKeyedArchiver.archivedDataWithRootObject(myDictionary) 
     try self.session.sendData(data, toPeers: self.session.connectedPeers, withMode: MCSessionSendDataMode.Unreliable) 
     } catch let error as NSError { 
       let ac = UIAlertController(title: "Send error", message: error.localizedDescription, preferredStyle: .Alert) 
        ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil)) 
        presentViewController(ac, animated: true, completion: nil) 
      } 
    } 
    self.firstLame.text = "" 
    self.lastName.text = "" 
} 


// Called when a peer sends an NSData to us 
func session(session: MCSession, didReceiveData data: NSData, fromPeer peerID: MCPeerID) { 

    // This needs to run on the main queue 
    dispatch_async(dispatch_get_main_queue()) { 
    let myDictionary = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! NSDictionary 
     self.firstNameLabel.text = myDictionary.valueForKey("itemA") as? String 
     self.lastNameLabel.text = myDictionary.valueForKey("itemB") as? String 

//   self.firstNameVar = myDictionary.valueForKey("itemA") as? String 
//   self.lastNameVar = myDictionary.valueForKey("itemB") as? String 
//   let image = myDictionary.valueForKey("itemC") as? String 
//   let imageData = NSKeyedUnarchiver.unarchiveObjectWithData(image) as? NSData 

    } 
} 

func browserViewControllerDidFinish(browserViewController: MCBrowserViewController) { 
    dismissViewControllerAnimated(true, completion: nil) 
} 
func browserViewControllerWasCancelled(browserViewController: MCBrowserViewController) { 
    dismissViewControllerAnimated(true, completion: nil) 
} 
func browserViewController(browserViewController: MCBrowserViewController, shouldPresentNearbyPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) -> Bool { 
    return true 
} 

func session(session: MCSession, peer peerID: MCPeerID, didChangeState state: MCSessionState) { 
    switch state { 
    case MCSessionState.Connected: 
     print("Connected: \(peerID.displayName)") 
    case MCSessionState.Connecting: 
     print("Connecting: \(peerID.displayName)") 
    case MCSessionState.NotConnected: 
     print("Not Connected: \(peerID.displayName)") 
    } 
} 

func session(session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, withProgress progress: NSProgress) { 
} 
func session(session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, atURL localURL: NSURL, withError error: NSError?) { 
} 
func session(session: MCSession, didReceiveStream stream: NSInputStream, withName streamName: String, fromPeer peerID: MCPeerID) { 
} 

func textFieldShouldReturn(textField: UITextField) -> Bool { 
    textField.resignFirstResponder() 
    return true 
} 


// Picking the image 
func chooseImageContact(){ 
    let imagePicker  = UIImagePickerController() 
    imagePicker.delegate = self 
    imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 
    self.presentViewController(imagePicker, animated: true, completion: nil) 
} 

//Scalling the image 
func scaleContactImageWith(image:UIImage, newSize:CGSize)->UIImage{ 
    UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0) 
    image.drawInRect(CGRectMake(0, 0, newSize.width, newSize.height)) 
    let newContactImage:UIImage = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() 
    return newContactImage 
} 

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { 
    //This gets the Contact image inside the imagePickerController 
     let pickedImage:UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage 
     let smallPicture  = scaleContactImageWith(pickedImage, newSize: CGSizeMake(100, 100)) 
     var sizeOfImage:CGRect = contactImage.frame 
     sizeOfImage.size = smallPicture.size 
     contactImage.frame = sizeOfImage 
     picker.dismissViewControllerAnimated(true, completion: nil) 
     contactImage.image = smallPicture 

     imageDataVar = UIImagePNGRepresentation(smallPicture)! 
    } 

} 

Answer 1

現在、データのdescriptionメソッドを使用してStringにNSDataを変換しています。絶対にしないでください。

もっと良い解決策は、辞書をアーカイブしてデータを送信するため、データをそのまま辞書に入れることです。画像データを文字列に変換する必要はありません。

受信側で受信したデータのアーカイブを解除し、辞書には既に画像のPNGデータがあります。