Zeromq interface function: Zmq_msg_init_data-Initializes a ZMQ message object's data from a specified storage space

ZeroMQ official address:http://api.zeromq.org/4-1:zmq_msg_init_data

Zmq_msg_init_data (3) ØMQ Manual-ømq/3.2.5

Name

Zmq_msg_init_data-initializes the data for a ZMQ Message Object from a specified storage space

Synopsis

void (ZMQ_FREE_FN) (voidvoid *hint); int void *data, size_t size, ZMQ_FREE_FN *ffn,void *hint);

Description

zmq_msg_init_data () parameters and size msg specified by the parameter. zmq zmq No copy operation is performed and zmq Get ownership of the specified data.

ffn , ffn will be in the Span style= "font-family: ' Times New Roman ';" >data zmq call once, zmq Span style= "font-family: the song Body;" > will zmq_msg_init_data () data and hint ffn function.

You should never directly manipulate the zmq_msg_t object directly, but instead use the zmq_msg function family to do so.

The three functions of Zmq_msg_init (),zmq_msg_init_data () , and zmq_msg_init_size () are mutually exclusive. Never initialize a zmq_msg_t object two of times.

Return value

A successful execution of function zmq_msg_init_data () returns 0. Otherwise , 1is returned, and the value of errno is set to the value specified below.

Errors

　Enomem

There is not enough storage space.

Example

　　Initializes the ZMQ message object with a specified storage space .

 void  *data, hint) {free (data);}  /*   ...  */ void  *data = malloc (6    abcdef  , 6   ); zmq_msg_t MSG;RC  = Zmq_msg_init_data (&msg, data, 6 , My_free, NULL); ASSERT (rc = = 0 ); 

See Also

Zmq_msg_init_size (3) zmq_msg_init (3) zmq_msg_close (3) zmq_msg_data (3) zmq_msg_size (3) ZMQ (7)

Authors

THISØMQ manual page was written by Martin Sustrik <[email Protected]> and Martin Lucina <[email Protected]>.

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Zeromq interface function: Zmq_msg_init_data-Initializes a ZMQ message object's data from a specified storage space