GUID structure
GUIDs identify objects such as interfaces, manager entry-point vectors (EPVs), and class objects. A GUID is a 128-bit value consisting of one group of 8 hexadecimal digits, followed by three groups of 4 hexadecimal digits each, followed by one group of 12 hexadecimal digits. The following example GUID shows the groupings of hexadecimal digits in a GUID: 6B29FC40-CA47-1067-B31D-00DD010662DA
The GUID structure stores a GUID.
Syntax
typedef struct _GUID { DWORD Data1; WORD Data2; WORD Data3; BYTE Data4[8]; } GUID;
Members
- Data1
-
Specifies the first 8 hexadecimal digits of the GUID.
- Data2
-
Specifies the first group of 4 hexadecimal digits.
- Data3
-
Specifies the second group of 4 hexadecimal digits.
- Data4
-
Array of 8 bytes. The first 2 bytes contain the third group of 4 hexadecimal digits. The remaining 6 bytes contain the final 12 hexadecimal digits.
Remarks
GUIDs are the Microsoft implementation of the distributed computing environment (DCE) universally unique identifier ( UUID). The RPC run-time libraries use UUIDs to check for compatibility between clients and servers and to select among multiple implementations of an interface. The Windows access-control functions use GUIDs to identify the type of object that an object-specific ACE in an access-control list (ACL) protects.
Requirements
Minimum supported client |
Windows 2000 Professional [desktop apps only] |
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Minimum supported server |
Windows 2000 Server [desktop apps only] |
Header |
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See also