タイプ '__NSCFString'の値を 'NSData'にキャストできません

Question

録画したビデオをmp4に変換してから、自分のサーバーにアップロードしようとしています。私は値をキャストすることに問題があり、どこでも解決策を探しました。特定のポイントでアプリケーションがクラッシュし、 'NSData'エラーに '__NSCFString'型の値をキャストできませんでした。どんな助けもありがとうございます。

let time = endDate.timeIntervalSince(startDate) 
      print(time) 
      print("Successful!") 
      print(exportSession?.outputURL as Any) 
      let mediaPath = exportSession?.outputURL?.path as NSString! 
      self.uploadVideo(mediaPath as! Data) 

//動画をアップロード

func uploadVideo(_ mediaPath: Data) { 

    func createBodyWithParams(_ parameters: [String: String]?, filePathKey: String?, mediaPath: Data, boundary: String) -> Data { 

     let body = NSMutableData(); 

     if parameters != nil { 
      for (key, value) in parameters! { 
       body.appendString("--\(boundary)\r\n") 
       body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n") 
       body.appendString("\(value)\r\n") 
      } 
     } 
     var filename = "" 

     if imageSelected == true { 
      filename = "video-\(uuid).mp4" 
     } 


     let mimetype = "video/mp4" 
     body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8)!) 
     body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n") 
     body.appendString(String(describing: "Content-Type: \(mimetype)\r\n\r\n".data(using: String.Encoding.utf8))) 
     body.append(mediaPath) 
     body.append(String(format: "\r\n").data(using: String.Encoding.utf8)!) 

     body.append("--\(boundary)--\r\n".data(using: String.Encoding.utf8)!) 

     return body as Data 

    } 
    let id = user!["id"] as! String 
    uuid = UUID().uuidString 


    let url = URL(string: "http://www.foo.com/videoposts.php")! 
    var request = URLRequest(url: url) 
    request.httpMethod = "POST" 

    let param = [ 
     "id" : id, 
     "uuid" : uuid 
    ] 
    print("just passed videopost page") 
    // body 
    let boundary = "Boundary-\(UUID().uuidString)" 
    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type") 

    // if picture is selected, compress it by half 
    //let imageData = Data() 


    // ... body 
    request.httpBody = createBodyWithParams(param, filePathKey: "filename", mediaPath: AnyObject, boundary: boundary) 

    // launch session 
    URLSession.shared.dataTask(with: request) { data, response, error in 

     // get main queu to communicate back to user 
     DispatchQueue.main.async(execute: { 


      if error == nil { 

       do { 

        // json containes $returnArray from php 
        let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary 

        // declare new var to store json inf 
        guard let parseJSON = json else { 
         print("Error while parsing") 
         return 
        } 

        // get message from $returnArray["message"] 
        let message = parseJSON["message"] 

        // if there is some message - post is made 
        if message != nil { 

         // reset UI 

         self.postBtn.alpha = 0.4 
         self.imageSelected = false 

         // switch to another scene 
         self.tabBarController?.selectedIndex = 4 

        } 

       } catch { 

        // get main queue to communicate back to user 
        DispatchQueue.main.async(execute: { 
         let message = "\(error)" 
         appDelegate.infoView(message: message, color: colorSmoothRed) 
        }) 
        return 

       } 

      } else { 

       // get main queue to communicate back to user 
       DispatchQueue.main.async(execute: { 
        let message = error!.localizedDescription 
        appDelegate.infoView(message: message, color: colorSmoothRed) 
       }) 
       return 

      } 


     }) 

     }.resume() 

} 

Answer 1

あなたはとにかくスウィフト3+でNSMutableDataを使用しないでくださいcreateBodyWithParams

にStringとDataを混合しています。私はStringとして体を構成し、最後にDataオブジェクトを作成することをお勧めしかしDataはvar

で可変です。

func createBodyWithParams(_ parameters: [String: String]?, filePathKey: String?, mediaPath: Data, boundary: String) -> Data { 

    var body = "" 

    if let params = parameters { 
     for (key, value) in params { 
      body += "--\(boundary)\r\n" 
      body += "Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n" 
      body += "\(value)\r\n" 
     } 
    } 
    var filename = "" 

    if imageSelected { 
     filename = "video-\(uuid).mp4" 
    } 

    let mimetype = "video/mp4" 
    body += "--\(boundary)\r\n" 
    body += "Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n" 
    body += "Content-Type: \(mimetype)\r\n\r\n" 
    body += String(data: mediaPath, encoding: .utf8)! 
    body += "\r\n" 

    body += "--\(boundary)--\r\n" 

    return Data(body.utf8) 

}