zuuid man page

zuuid — UUID support class

Synopsis

//  This is a stable class, and may not change except for emergencies. It
//  is provided in stable builds.
//  Create a new UUID object.
CZMQ_EXPORT zuuid_t *
    zuuid_new (void);

//  Create UUID object from supplied ZUUID_LEN-octet value.
CZMQ_EXPORT zuuid_t *
    zuuid_new_from (const byte *source);

//  Destroy a specified UUID object.
CZMQ_EXPORT void
    zuuid_destroy (zuuid_t **self_p);

//  Set UUID to new supplied ZUUID_LEN-octet value.
CZMQ_EXPORT void
    zuuid_set (zuuid_t *self, const byte *source);

//  Set UUID to new supplied string value skipping '-' and '{' '}'
//  optional delimiters. Return 0 if OK, else returns -1.
CZMQ_EXPORT int
    zuuid_set_str (zuuid_t *self, const char *source);

//  Return UUID binary data.
CZMQ_EXPORT const byte *
    zuuid_data (zuuid_t *self);

//  Return UUID binary size
CZMQ_EXPORT size_t
    zuuid_size (zuuid_t *self);

//  Returns UUID as string
CZMQ_EXPORT const char *
    zuuid_str (zuuid_t *self);

//  Return UUID in the canonical string format: 8-4-4-4-12, in lower
//  case. Caller does not modify or free returned value. See
//  http://en.wikipedia.org/wiki/Universally_unique_identifier
CZMQ_EXPORT const char *
    zuuid_str_canonical (zuuid_t *self);

//  Store UUID blob in target array
CZMQ_EXPORT void
    zuuid_export (zuuid_t *self, byte *target);

//  Check if UUID is same as supplied value
CZMQ_EXPORT bool
    zuuid_eq (zuuid_t *self, const byte *compare);

//  Check if UUID is different from supplied value
CZMQ_EXPORT bool
    zuuid_neq (zuuid_t *self, const byte *compare);

//  Make copy of UUID object; if uuid is null, or memory was exhausted,
//  returns null.
CZMQ_EXPORT zuuid_t *
    zuuid_dup (zuuid_t *self);

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

Description

The zuuid class generates UUIDs and provides methods for working with them. If you build CZMQ with libuuid, on Unix/Linux, it will use that library. On Windows it will use UuidCreate(). Otherwise it will use a random number generator to produce convincing imitations of UUIDs.

Please add @discuss section in ../src/zuuid.c.

Example

From zuuid_test method.

//  Simple create/destroy test
assert (ZUUID_LEN == 16);
assert (ZUUID_STR_LEN == 32);

zuuid_t *uuid = zuuid_new ();
assert (uuid);
assert (zuuid_size (uuid) == ZUUID_LEN);
assert (strlen (zuuid_str (uuid)) == ZUUID_STR_LEN);
zuuid_t *copy = zuuid_dup (uuid);
assert (streq (zuuid_str (uuid), zuuid_str (copy)));

//  Check set/set_str/export methods
const char *myuuid = "8CB3E9A9649B4BEF8DE225E9C2CEBB38";
const char *myuuid2 = "8CB3E9A9-649B-4BEF-8DE2-25E9C2CEBB38";
const char *myuuid3 = "{8CB3E9A9-649B-4BEF-8DE2-25E9C2CEBB38}";
const char *myuuid4 = "8CB3E9A9649B4BEF8DE225E9C2CEBB3838";
int rc = zuuid_set_str (uuid, myuuid);
assert (rc == 0);
assert (streq (zuuid_str (uuid), myuuid));
rc = zuuid_set_str (uuid, myuuid2);
assert (rc == 0);
assert (streq (zuuid_str (uuid), myuuid));
rc = zuuid_set_str (uuid, myuuid3);
assert (rc == 0);
assert (streq (zuuid_str (uuid), myuuid));
rc = zuuid_set_str (uuid, myuuid4);
assert (rc == -1);
byte copy_uuid [ZUUID_LEN];
zuuid_export (uuid, copy_uuid);
zuuid_set (uuid, copy_uuid);
assert (streq (zuuid_str (uuid), myuuid));

//  Check the canonical string format
assert (streq (zuuid_str_canonical (uuid),
               "8cb3e9a9-649b-4bef-8de2-25e9c2cebb38"));

zuuid_destroy (&uuid);
zuuid_destroy (&copy);

Authors

The czmq manual was written by the authors in the Authors file.

Resources

Main web site:

Report bugs to the email <zeromq-dev@lists.zeromq.org[1]>

Notes

1.

zeromq-dev@lists.zeromq.org

mailto:zeromq-dev@lists.zeromq.org

Referenced By

czmq(7).

11/11/2016 CZMQ 4.0.1 CZMQ Manual