begin-write-header-footer-to-file

This method must be called before writing any special header data to a stream.

See File Formats and write-headers-to-file for more information.

• (send a-wx:media-buffer begin-write-header-footer-to-file f name buffer) -> void
      f : wx:media-stream-out% object
      name : string
      buffer : boxed small integer

  The name string must be a unique name that can be used by a header reader to recognize the data. This method will store a value in buffer that should be passed on to end-write-header-footer-to-file.