c语言获取电脑唯一编号,C语言生成唯一标识的uuid

/* For uuid_generate() and uuid_unparse() */

#include /* Uncomment to always generate capital UUIDs. */

//#define capitaluuid true

/* Uncomment to always generate lower-case UUIDs. */

//#define lowercaseuuid true

/*

* Don't uncomment either if you don't care (the case of the letters

* in the 'unparsed' UUID will depend on your system's locale).

*/

int main(void) {

uuid_t binuuid;

/*

* Generate a UUID. We're not done yet, though,

* for the UUID generated is in binary format

* (hence the variable name). We must 'unparse'

* binuuid to get a usable 36-character string.

*/

uuid_generate_random(binuuid);

/*

* uuid_unparse() doesn't allocate memory for itself, so do that with

* malloc(). 37 is the length of a UUID (36 characters), plus '\0'.

*/

char *uuid = malloc(37);

#ifdef capitaluuid

/* Produces a UUID string at uuid consisting of capital letters. */

uuid_unparse_upper(binuuid, uuid);

#elif lowercaseuuid

/* Produces a UUID string at uuid consisting of lower-case letters. */

uuid_unparse_lower(binuuid, uuid);

#else

/*

* Produces a UUID string at uuid consisting of letters

* whose case depends on the system's locale.

*/

uuid_unparse(binuuid, uuid);

#endif

// Equivalent of printf("%s\n", uuid); - just my personal preference

puts(uuid);

return 0;

}