0MQ Api

#define ZFRAME_MORE 1                       //
#define ZFRAME_REUSE 2                      //
#define ZFRAME_DONTWAIT 4                   //

//  Create a new frame. If size is not null, allocates the frame data
//  to the specified size. If additionally, data is not null, copies
//  size octets from the specified data into the frame body.
CZMQ_EXPORT zframe_t *
    zframe_new (const void *data, size_t size);

//  Destroy a frame
CZMQ_EXPORT void
    zframe_destroy (zframe_t **self_p);

//  Create an empty (zero-sized) frame
//  The caller is responsible for destroying the return value when finished with it.
CZMQ_EXPORT zframe_t *
    zframe_new_empty ();

//  Create a frame with a specified string content.
//  The caller is responsible for destroying the return value when finished with it.
CZMQ_EXPORT zframe_t *
    zframe_from (const char *string);

//  Receive frame from socket, returns zframe_t object or NULL if the recv
//  was interrupted. Does a blocking recv, if you want to not block then use
//  zpoller or zloop.
//  The caller is responsible for destroying the return value when finished with it.
CZMQ_EXPORT zframe_t *
    zframe_recv (void *source);

//  Send a frame to a socket, destroy frame after sending.
//  Return -1 on error, 0 on success.
CZMQ_EXPORT int
    zframe_send (zframe_t **self_p, void *dest, int flags);

//  Return number of bytes in frame data
CZMQ_EXPORT size_t
    zframe_size (zframe_t *self);

//  Return address of frame data
CZMQ_EXPORT byte *
    zframe_data (zframe_t *self);

//  Create a new frame that duplicates an existing frame. If frame is null,
//  or memory was exhausted, returns null.
//  The caller is responsible for destroying the return value when finished with it.
CZMQ_EXPORT zframe_t *
    zframe_dup (zframe_t *self);

//  Return frame data encoded as printable hex string, useful for ØMQ UUIDs.
//  Caller must free string when finished with it.
//  The caller is responsible for destroying the return value when finished with it.
CZMQ_EXPORT char *
    zframe_strhex (zframe_t *self);

//  Return frame data copied into freshly allocated string
//  Caller must free string when finished with it.
//  The caller is responsible for destroying the return value when finished with it.
CZMQ_EXPORT char *
    zframe_strdup (zframe_t *self);

//  Return TRUE if frame body is equal to string, excluding terminator
CZMQ_EXPORT bool
    zframe_streq (zframe_t *self, const char *string);

//  Return frame MORE indicator (1 or 0), set when reading frame from socket
//  or by the zframe_set_more() method
CZMQ_EXPORT int
    zframe_more (zframe_t *self);

//  Set frame MORE indicator (1 or 0). Note this is NOT used when sending
//  frame to socket, you have to specify flag explicitly.
CZMQ_EXPORT void
    zframe_set_more (zframe_t *self, int more);

//  Return TRUE if two frames have identical size and data
//  If either frame is NULL, equality is always false.
CZMQ_EXPORT bool
    zframe_eq (zframe_t *self, zframe_t *other);

//  Set new contents for frame
CZMQ_EXPORT void
    zframe_reset (zframe_t *self, const void *data, size_t size);

//  Send message to zsys log sink (may be stdout, or system facility as
//  configured by zsys_set_logstream). Prefix shows before frame, if not null.
CZMQ_EXPORT void
    zframe_print (zframe_t *self, const char *prefix);

//  Probe the supplied object, and report if it looks like a zframe_t.
CZMQ_EXPORT bool
    zframe_is (void *self);

//  Self test of this class
CZMQ_EXPORT void
    zframe_test (bool verbose);