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我正在使用 python SocketServer 下载/上传多图像文件。

服务器代码

class ThreadedTCPRequestHandler(SocketServer.BaseRequestHandler):
    def handle(self):

        '''
        Here is other codes......
        '''

        #start sending files to client...
        for img_name, img_size in dict_image_sizes.iteritems():
            image_file = open(u"%s\\%s" % (image_folder, img_name), 'rb')

            while True:
                image_chunk = image_file.read(32768)

                if not image_chunk:
                    break

                self.request.sendall(image_chunk)

            image_file.close()

客户代码:

    #start recving...
    for img_name, img_size in dict_image_sizes.iteritems():
        each_image_file = open(u'%s\\%s\\%s' % (env.cache_path, relative_path, img_name), 'wb')

        chunk_size = 4096

        img_size_int = int(int(img_size)/chunk_size)
        img_size_mod = int(math.fmod(int(img_size), chunk_size))

        import time
        image_chunk = ''
        for i in range(img_size_int):
            image_chunk += sock.recv(chunk_size)
            #time.sleep(0.001)

        image_chunk += sock.recv(img_size_mod)
        each_image_file.write(image_chunk)

        each_image_file.close()

问题是,如果我取消标记

            #time.sleep(0.001)

在客户端代码中,它会好的。否则,许多图像可能会损坏(并非总是如此,有时)。

Corrupt JPEG data: premature end of data segment

有没有办法解决这个问题?我试图添加

sock.settimeout(1) 

对于客户,但它不起作用。

问题解决了。我们需要检查发送/接收每次返回的确切字节。在这里咨询:Python中的非阻塞套接字?

def recvall(sock, size):
  data = ''
  while len(data) < size:
    d = sock.recv(size - len(data))
    if not d:
      # Connection closed by remote host, do what best for you
      return None
    data += d
  return data

def sendall(sock, data):
  while data:
    sent = sock.send(data)
    data = data[sent:]
4

1 回答 1

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套接字连接的最大操作系统发送/接收缓冲区大小。如果没有time.sleep,所有请求都会立即发送并填充缓冲区。

于 2013-10-29T06:35:59.233 回答