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Queries whether the object has a valid major type.
BOOL IsValid( ) const;
Return Values
Returns one of the following values.
| TRUE | CMediaTypeobject has a valid major type. |
| FALSE | CMediaTypeobject does not have a valid major type. |
Remarks
When CMediaTypeobjects are constructed, their GUIDs are initialized with GUID_NULL (unless they are constructed based on another AM_MEDIA_TYPEstructure or CMediaTypeobject). This member function is useful for discovering if the object has been correctly initialized.