Programming With QuickTime VR

Node Header Atom Structure

A node header atom is a leaf atom that describes the type and ID of a node, as well as other information about the node. Its atom type is kQTVRNodeHeaderAtomType ('ndhd' ).

The structure of a node header atom is defined by the VRNodeHeaderAtom data type:



 
typedef struct VRNodeHeaderAtom {

    UInt16                              majorVersion;

    UInt16                              minorVersion;

    OSType                              nodeType;

    QTAtomID                            nodeID;

    QTAtomID                            nameAtomID;

    QTAtomID                            commentAtomID;

    UInt32                              reserved1;

    UInt32                              reserved2;

} VRNodeHeaderAtom, *VRNodeHeaderAtomPtr;

majorVersion: The major version number of the file format.
minorVersion: The minor version number of the file format.
nodeType: The node type. See "Node Types" in Chapter 2, "QuickTime VR Manager," for a description of the available node types. Currently, this field should contain either kQTVRPanoramaType or kQTVRObjectType .
nodeID: The node ID.
nameAtomID: The ID of the string atom that contains the name of the node. This atom should be a sibling of the node header atom. The value of this field is 0 if no name string atom exists.
commentAtomID: The ID of the string atom that contains a comment for the node. This atom should be a sibling of the node header atom. The value of this field is 0 if no comment string atom exists.
reserved1: Reserved. This field must be 0.
reserved2: Reserved. This field must be 0.