[C++] DCMTK - Generate UID

https://github.com/okigan/dcmtk/blob/master/dcmdata/include/dcmtk/dcmdata/dcuid.h

/** creates a Unique Identifer in uid and returns uid.

 *  uid must be at least 65 bytes. Care is taken to make sure

 *  that the generated UID is 64 characters or less.

 *  If a prefix string is not passed as the second argument a

 *  default of SITE_INSTANCE_UID_ROOT (see below) will be used.

 *  Otherwise the supplied prefix string will appear at the beginning

 *  of uid.

 *  The UID is created by appending to the prefix the following:

 *       the host id (if obtainable, zero otherwise),

 *       the process id (if obtainable, zero otherwise),

 *       the system calendar time, and

 *       an accumulating counter for tis process.

 *  @param uid pointer to buffer of 65 or more characters in which the UID is returned

 *  @param prefix prefix for UID creation

 *  @return pointer to UID, identical to uid parameter

 */

DCMTK_DCMDATA_EXPORT char *dcmGenerateUniqueIdentifier ( char *uid, const char* prefix = NULL );

#include "dcmtk/dcmdata/dcuid.h"

....

char *uid = NULL;

dcmGenerateUniqueIdentifier(uid);

.....