关于

NodeData based classic plugin classes can implement NodeData::Read() and NodeData::Write() . This allows to store internal data that is not stored in the BaseContainer when the scene is saved to a *.c4d file.

注意: 若 NodeData::Read() and NodeData::Write() are implemented typically also NodeData::CopyTo() should be implemented.

NodeData::Read() corresponds to C4DAtom::Read() , NodeData::Write() corresponds to C4DAtom::Write() .

另请参阅 BaseDocument Disc I/O .

用法

NodeData::Read() is called when a *.c4d file is loaded, NodeData::Write() is called when the element is saved to a *.c4d file. The given HyperFile object represents this *.c4d file.

// This example stores an internal list and an integer value with the actual object.

Bool Read( GeListNode * node, HyperFile * hf, Int32 level) { if (level >= 0) // checks the plugin level { // read a GeListHead _branchHead->ReadObject(hf, true ); // read an integer value hf-> ReadInt32 (&_value); } return true ; } Bool Write( GeListNode * node, HyperFile * hf) { // store a GeListHead _branchHead->WriteObject(hf); // store an integer value hf-> WriteInt32 (_value); return true ; }

The arguments of the functions are:

The node itself.
The HyperFile to read from or write to. See HyperFile Manual .
The element level: This is the plugin version defined with the "Register" function. See 配准 .

注意: The order of operations needs to be the same in both function implementations.; 当 NodeData::Read() is called the element is not yet part of a BaseDocument .; To check if a message dialog can be shown in the context of NodeData::Read() , use HyperFile::GetFilterFlags() to check if SCENEFILTER::DIALOGSALLOWED is set.

延伸阅读

HyperFile::WriteInt32

Bool WriteInt32(Int32 v)

GeListNode

Represents a C4DAtom that resides in a 4D list.

定义： c4d_baselist.h:1767

HyperFile::ReadInt32

Bool ReadInt32(Int32 *v)

Int32

maxon::Int32 Int32

定义： ge_sys_math.h:58

HyperFile

定义： c4d_file.h:1069

Bool

maxon::Bool Bool

定义： ge_sys_math.h:53