Inside Macintosh: OpenDoc Class Reference /

Part 1 - Classes and Methods / ODObject

HasExtension

The HasExtension method returns a Boolean value that indicates whether the object supports the specified extension.

ODBoolean HasExtension (in ODType extensionName);

extensionName

The name of the extension to look for.

return value

kODTrue if the object supports the specified extension, otherwise kODFalse.

DISCUSSION

Your part can call this method before accessing an object's extension.

The ODObject class has no inherent extensions of its own and always returns kODFalse.

OVERRIDING

Your subclass of ODPart can override this method if your part supports extensions. If your part does not support the specified extension, your override method must call its inherited HasExtension method at the end of your implementation.

SEE ALSO

The ODObject::AcquireExtension method (page 440).
The ODObject::ReleaseExtension method (page 444).
The ODPart class (page 459).
Table 2-1 on page 89 in OpenDoc Programmer's Guide.
"Making Your Semantic-Interface Extension Available" on page 433 in OpenDoc Programmer's Guide.
"Using an Extension" on page 444 in OpenDoc Programmer's Guide.