无法使用Base64将字符串解码为图像

在我正在构建的android应用程序中,我使用Base64将jpg图像转换为字符串。encodeToString()并通过TCP套接字发送到服务器。

问题是当我尝试将字符串解码回图像时。 我可以打印我收到的字符串,它在文件末尾看起来是这样的(我唯一可以复制的部分,因为文件太大,无法在终端上打印所有内容):

....+77DgjRKHqbxBmYCDOzv9vLzFwff4N146snCWin6ZlzbN++HJOIIPodB/JTOoc1NjczeqoHwOju
iWdI6ePeSO0ADz46vh4LODnM7FCJYhbTX0TizmNatXvxSFoVzLiqfn19iYjvAPD/AQnRoUxtpJij
AAAAAElFTkSuQmCC

但当我再次尝试解码并保存到jpg文件时,我得到以下错误:

Traceback (most recent call last):
  File "tcp.py", line 20, in <module>
    file.write(base64.decodestring(msg))
  File "/usr/lib/python2.7/base64.py", line 328, in decodestring
    return binascii.a2b_base64(s)
binascii.Error: Incorrect padding

下面是我的一段Android应用程序代码,用于编码和发送消息:

//Function that encodes the Bitmapfile into string
    public String BitMapToString(Bitmap bitmap){
        ByteArrayOutputStream baos=new  ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG,100, baos);
        byte [] arr=baos.toByteArray();
        String result=Base64.encodeToString(arr, Base64.DEFAULT);
        return result;
    }

    class myTask extends AsyncTask<Void,Void,Void>
    {
        //Faz a conexao entre aparelho e servidor
        @Override
        protected Void doInBackground(Void... params){

            try
            {
                //create socket and buffer to send the string message
                newSocket = new Socket(ipAdress,5000);
                printWriter = new PrintWriter(newSocket.getOutputStream());
                bufferedWriter = new BufferedWriter(new OutputStreamWriter(newSocket.getOutputStream()));

                //Reads the internal storage image and converts into string using Base64
                File file  = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM+"/Reccoon3D/123.jpg");
                Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
                message = BitMapToString(bitmap); //encodes the bitmap
                //sends the enconded image
                bufferedWriter.write(message);
                bufferedWriter.flush();
                bufferedWriter.close();
                newSocket.close();
            }catch (Exception e)
            {
                e.printStackTrace();
            }
            return null;
        }
    }

下面是我的python代码,它接收消息并尝试再次将其解码为图像:

import socket
import base64 

host = '192.168.1.16'
port = 5000
tcp=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
orig = (host,port)
tcp.bind(orig)
tcp.listen(1)
file=open('file.png','wb')

while True:
    con, client = tcp.accept()
    print('Conected by', client)
    while True:
        msg = con.recv(1024000) #Initially 1024 but changet so the message
                                #would not be sliced into pieces
        if not msg: break
        #print(msg)
        file.write(base64.decodestring(msg))

    print('Finalizado com sucesso')
    con.close