| title | uuid (C++) | Microsoft Docs | ||
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| ms.date | 11/04/2016 | ||
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| ms.tgt_pltfrm | |||
| ms.topic | language-reference | ||
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| ms.assetid | 9d004621-09bc-4a8d-871b-648f5d5102d7 | ||
| caps.latest.revision | 7 | ||
| author | mikeblome | ||
| ms.author | mblome | ||
| manager | ghogen |
Microsoft Specific
The compiler attaches a GUID to a class or structure declared or defined (full COM object definitions only) with the uuid attribute.
__declspec( uuid("
ComObjectGUID
") ) declarator
The uuid attribute takes a string as its argument. This string names a GUID in normal registry format with or without the { } delimiters. For example:
struct __declspec(uuid("00000000-0000-0000-c000-000000000046")) IUnknown;
struct __declspec(uuid("{00020400-0000-0000-c000-000000000046}")) IDispatch;
This attribute can be applied in a redeclaration. This allows the system headers to supply the definitions of interfaces such as IUnknown, and the redeclaration in some other header (such as COMDEF.H) to supply the GUID.
The keyword __uuidof can be applied to retrieve the constant GUID attached to a user-defined type.
END Microsoft Specific