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Python Programming On Win32
book

Python Programming On Win32

by Andy Robinson, Mark Hammond
January 2000
Intermediate to advanced
672 pages
21h 46m
English
O'Reilly Media, Inc.
Content preview from Python Programming On Win32

Globally Unique Identifiers

As mentioned earlier in the chapter, a COM object registers itself with a unique identifier. Whenever COM needs a truly unique identifier, it uses a globally unique identifier or GUID. A GUID is a 128-bit number, generated using a complex algorithm and the unique ID burnt into a computer’s network interface card, which makes it statistically improbable the same number will ever be generated twice.

New GUIDs can be created from Python code using the following code:

>>> import pythoncom
>>> print pythoncom.CreateGuid()
{FA21CDC1-381F-11D3-8559-204C4F4F5020}

Python prints the GUID using the standard hexadecimal representation inside braces, and this same format is used everywhere an ASCII representation of a GUID is required.

GUIDs are used for a variety of purposes in COM; we have already discussed how they function as CLSIDs to uniquely identify object implementations, and in later chapters you’ll see them put to use in a variety of different ways.

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Publisher Resources

ISBN: 1565926218Errata Page