Share via


GUID

This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.

Describes a globally unique identifier (GUID).

Header file:

Mapiguid.h

typedef struct _GUID
{
  unsigned long Data1;
  unsigned short Data2;
  unsigned short Data3;
  unsigned char Data4[8];
} GUID;

Members

  • Data1
    An unsigned long integer data value.

  • Data2
    An unsigned short integer data value.

  • Data3
    An unsigned short integer data value.

  • Data4
    An array of unsigned characters.

Remarks

GUID structures are used in MAPI as follows:

  • In the MAPIUID structures that uniquely identify service providers.

  • For interface identifiers.

  • In the property set names of named properties.

Message store and address book providers generate a GUID structure to use in their MAPIUID structure. By passing the resulting MAPIUID to IMAPISupport::SetProviderUID, these service providers inform MAPI of their unique identifier.

Also, they are used in the implementation of Microsoft Remote Procedure Call (RPC) and the Object Description Language (ODL). For more information about these uses, see the Microsoft RPC Programmer's Guide and Reference, OLE Programmer's Reference,and Inside OLE, Second Edition.

The GUID structure is defined in the Win32 Programmer's Reference. Specific values for GUID structures that are used within MAPI are defined in the MAPI header file Mapiguid.h.

See Also

Reference

MAPIUID

Concepts

MAPI Structures