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A zmq message Frame class for non-copying send/recvs and access to message properties.
A ``zmq.Frame`` wraps an underlying ``zmq_msg_t``.
Message *properties* can be accessed by treating a Frame like a dictionary (``frame["User-Id"]``).
.. versionadded:: 14.4, libzmq 4
Frames created by ``recv(copy=False)`` can be used to access message properties and attributes,
such as the CURVE User-Id.
For example::
frames = socket.recv_multipart(copy=False)
user_id = frames[0]["User-Id"]
This class is used if you want to do non-copying send and recvs.
When you pass a chunk of bytes to this class, e.g. ``Frame(buf)``, the
ref-count of `buf` is increased by two: once because the Frame saves `buf` as
an instance attribute and another because a ZMQ message is created that
points to the buffer of `buf`. This second ref-count increase makes sure
that `buf` lives until all messages that use it have been sent.
Once 0MQ sends all the messages and it doesn't need the buffer of ``buf``,
0MQ will call ``Py_DECREF(s)``.
Parameters
----------
data : object, optional
any object that provides the buffer interface will be used to
construct the 0MQ message data.
track : bool [default: False]
whether a MessageTracker_ should be created to track this object.
Tracking a message has a cost at creation, because it creates a threadsafe
Event object.
copy : bool [default: use copy_threshold]
Whether to create a copy of the data to pass to libzmq
or share the memory with libzmq.
If unspecified, copy_threshold is used.
copy_threshold: int [default: zmq.COPY_THRESHOLD]
If copy is unspecified, messages smaller than this many bytes
will be copied and messages larger than this will be shared with libzmq.
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Requires libzmq >= 4.2 and pyzmq built with draft APIs enabled.
.. versionadded:: 17
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Requires libzmq >= 4.2 and pyzmq built with draft APIs enabled.
.. versionadded:: 17
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