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2.5.11.2 GUID

Name

GUID

typedef struct _GUID {
    DWORD Data1;
    WORD   Data2;
    WORD   Data3;
    BYTE  Data4[8];
} GUID;

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: Specifies an 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.

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 shows the groupings of hexadecimal digits in a GUID.

origin.h