write-header

Called to write header information that may be useful for every snip written for this class. This method is only called once per buffer write session, and only if the buffer contains snips in this class. This method will not be called again until after a call to write-done.

When reading the snips back in, read-header will only be called if write-header writes some data to the stream.

The return value is #f if a write error occurs or anything else otherwise.

• (send a-wx:snip-class write-header stream) -> boolean
      stream : wx:media-stream-out% object