ActiveOutFile
Name
ActiveOutFile --  An object that actively updates its file stream when updated.
Description
 This is the file I/O equivalent of ActiveGraph: it takes an OutFile  object, a target (datafeed) object, and a selector, which it uses to extract data from the object and send it to the file. 
Methods
Phase: Creating
- -  setDataFeed: d-  The setDataFeed: method sets the object that will be probed for data. 
- -  setHDF5Dataset:-  (id <HDF5>) hdf5Dataset-  Sets an extensible HDF5 dataset that data will be appended. 
- -  setFileObject: aFileObj-  The setFileObject: method sets the file object to which the data will be sent. 
Phase: Using
- - (double) getCurrentValue-  Returns the last probed value 
- - (void) step-  The step method fires the probe, reads the value from the object, and  sends the value to the file.