ftp image uploadによって画像が短時間で切断される

Question

IOSアプリケーションでftp経由で画像をアップロードするgithubで見つかったコードをテストしています。問題は、半サイズの画像をアップロードしようとすると、アップロードされた画像が破損しているように見え、上の部分だけが表示され、残りの部分は切り取られているように見えます。それは、より小さな画像またはより高い圧縮を伴う大きな画像ではうまくいくようです。誰がこれを引き起こしているか知っていますか？

let ftpup = FTPUpload(baseUrl: "mysite.com", userName: "user@mysite.com", password: "password", directoryPath: "") 

    let image = UIImage(named: "medium") 
    let imagedata = UIImageJPEGRepresentation(image!, 1) 

    ftpup.send(data: imagedata!, with: "cloudpowa.jpg", success: {(success) -> Void in 
     if !success { 
      print("Failed upload!") 
     } 
     else { 
      print("image uploaded!") 
     } 
    }) 

からのftpコード：https://gist.github.com/Nirma/fb9991be776107d17fdcd6ed2aa02876

import Foundation 
import CFNetwork 

public class FTPUpload { 
    fileprivate let ftpBaseUrl: String 
    fileprivate let directoryPath: String 
    fileprivate let username: String 
    fileprivate let password: String 

    public init(baseUrl: String, userName: String, password: String, directoryPath: String) { 
     self.ftpBaseUrl = baseUrl 
     self.username = userName 
     self.password = password 
     self.directoryPath = directoryPath 
    } 
} 


// MARK: - Steam Setup 
extension FTPUpload { 
    private func setFtpUserName(for ftpWriteStream: CFWriteStream, userName: CFString) { 
     let propertyKey = CFStreamPropertyKey(rawValue: kCFStreamPropertyFTPUserName) 
     CFWriteStreamSetProperty(ftpWriteStream, propertyKey, userName) 
    } 

    private func setFtpPassword(for ftpWriteStream: CFWriteStream, password: CFString) { 
     let propertyKey = CFStreamPropertyKey(rawValue: kCFStreamPropertyFTPPassword) 
     CFWriteStreamSetProperty(ftpWriteStream, propertyKey, password) 
    } 

    fileprivate func ftpWriteStream(forFileName fileName: String) -> CFWriteStream? { 
     let fullyQualifiedPath = "ftp://\(ftpBaseUrl)/\(directoryPath)/\(fileName)" 

     guard let ftpUrl = CFURLCreateWithString(kCFAllocatorDefault, fullyQualifiedPath as CFString, nil) else { return nil } 
     let ftpStream = CFWriteStreamCreateWithFTPURL(kCFAllocatorDefault, ftpUrl) 
     let ftpWriteStream = ftpStream.takeRetainedValue() 
     setFtpUserName(for: ftpWriteStream, userName: username as CFString) 
     setFtpPassword(for: ftpWriteStream, password: password as CFString) 
     return ftpWriteStream 
    } 
} 


// MARK: - FTP Write 
extension FTPUpload { 
    public func send(data: Data, with fileName: String, success: @escaping ((Bool)->Void)) { 

     guard let ftpWriteStream = ftpWriteStream(forFileName: fileName) else { 
      success(false) 
      return 
     } 

     if CFWriteStreamOpen(ftpWriteStream) == false { 
      print("Could not open stream") 
      success(false) 
      return 
     } 

     let fileSize = data.count 
     let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: fileSize) 
     data.copyBytes(to: buffer, count: fileSize) 

     defer { 
      CFWriteStreamClose(ftpWriteStream) 
      buffer.deallocate(capacity: fileSize) 
     } 

     var offset: Int = 0 
     var dataToSendSize: Int = fileSize 

     repeat { 
      let bytesWritten = CFWriteStreamWrite(ftpWriteStream, &buffer[offset], dataToSendSize) 
      if bytesWritten > 0 { 
       offset += bytesWritten.littleEndian 
       dataToSendSize -= bytesWritten 
       continue 
      } else if bytesWritten < 0 { 
       // ERROR 
       print("FTPUpload - ERROR") 
       break 
      } else if bytesWritten == 0 { 
       // SUCCESS 
       print("FTPUpload - Completed!!") 
       break 
      } 
     } while CFWriteStreamCanAcceptBytes(ftpWriteStream) 

     success(true) 
    } 
} 

Answer 1

私はそれが唯一の令状ことがわかっ

while (true) 

に

while CFWriteStreamCanAcceptBytes(ftpWriteStream) 

からFTPアップロードクラス内の以下を変更一度、前者と一緒に。