zmq_msg_get.txt

zmq_msg_get(3)
==============


NAME
----
zmq_msg_get - get message property


SYNOPSIS
--------
*int zmq_msg_get (zmq_msg_t '*message', int 'property');*


DESCRIPTION
-----------
The _zmq_msg_get()_ function shall return the value for the property
specified by the 'property' argument for the message pointed to by the
'message' argument.

The following properties can be retrieved with the _zmq_msg_get()_ function:

*ZMQ_MORE*::
Indicates that there are more message frames to follow after the 'message'.

RETURN VALUE
------------
The _zmq_msg_get()_ function shall return zero if successful. Otherwise it
shall return `-1` and set 'errno' to one of the values defined below.


ERRORS
------
*EINVAL*::
The requested _property_ is unknown.


EXAMPLE
-------
.Receiving a multi-frame message
----
while (true) {
    //  Create an empty 0MQ message to hold the message frame
    int rc = zmq_msg_init (&frame);
    assert (rc == 0);
    //  Block until a message is available to be received from socket
    rc = zmq_recvmsg (socket, &frame, 0);
    assert (rc != -1);
    if (zmq_msg_get (&frame, ZMQ_MORE))
        fprintf (stderr, "more\n");
    else {
        fprintf (stderr, "end\n");
        break;
    }
    zmq_msg_close (frame);
}
----


SEE ALSO
--------
linkzmq:zmq_msg_set[3]
linkzmq:zmq_msg_init[3]
linkzmq:zmq_msg_close[3]
linkzmq:zmq[7]


AUTHORS
-------
This 0MQ manual page was written by Chuck Remes <cremes@mac.com> and Pieter
Hintjens <ph@imatix.com>.