libuuid的使用

摘自：https://www.jianshu.com/p/3f9c2e8ac9d0

#include <stdio.h>
#include <uuid/uuid.h>
// yum -y install libuuid-devel.x86_64

int test_libuuid()
{
    uuid_t uuid1, uuid2, uuid3, uuid4, uuid5;
    char uuid1_str[37], uuid2_str[37], uuid3_str[37], uuid4_str[37];

    uuid_generate(uuid1);
    uuid_unparse(uuid1, uuid1_str);
    fprintf(stdout, "uuid1 result: %s\n", uuid1_str);


    uuid_generate_random(uuid2);
    uuid_unparse_lower(uuid2, uuid2_str);
    fprintf(stdout, "uuid2 result: %s\n", uuid2_str);

    uuid_generate_time(uuid3);
    uuid_unparse_upper(uuid3, uuid3_str);
    fprintf(stdout, "uuid3 result: %s\n", uuid3_str);

    uuid_generate_time_safe(uuid4);
    uuid_unparse(uuid4, uuid4_str);
    fprintf(stdout, "uuid4 result: %s\n", uuid4_str);

    uuid_parse(uuid1_str, uuid5);
    int ret = uuid_compare(uuid1, uuid5);
    fprintf(stdout, "uuid1 compare uuid5: %d\n", ret);

    ret = uuid_is_null(uuid1);
    fprintf(stdout, "uuid1 is null: %d\n", ret);
    uuid_clear(uuid1);
    ret = uuid_is_null(uuid1);
    fprintf(stdout, "uuid1 is null: %d\n", ret);

    ret = uuid_type(uuid2);
    fprintf(stdout, "uuid2 type: %d\n", ret);
    ret = uuid_variant(uuid2);
    fprintf(stdout, "uuid2 variant: %d\n", ret);

    struct timeval tv;
    time_t time_reg = uuid_time(uuid3, &tv);
    fprintf(stdout, "uuid3 time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec, ctime(&time_reg));

    return 0;
}

int main()
{
    test_libuuid();

    return 0;
}

 

gcc uuid.c -o uuid -luuid