# CoCreateGuid

Creates a GUID, a unique 128-bit integer used for CLSIDs and interface identifiers.

HRESULT CoCreateGuid(

GUID *pguid | //Pointer to the GUID on return
); |

Parameter

pguid
  [out] Pointer to the requested GUID on return.

Return Value

S_OK
  The GUID was successfully created.

Win32 errors are returned by UuidCreate but wrapped as an HRESULT.

Remarks

The CoCreateGuid function calls the RPC function UuidCreate, which creates a GUID, a globally unique 128-bit integer. Use the CoCreateGuid function when you need an absolutely unique number that you will use as a persistent identifier in a distributed environment.To a very high degree of certainty, this function returns a unique value no other invocation, on the same or any other system (networked or not), should return the same value.

See Also

UuidCreate (documented in the RPC Programmer’s Guide and Reference)