Re: [udf-dlm-develop] preventing an "Execution Halted at:"

[Ed S. <es...@la...>]

  >I know of IDL's 'catch,
  >error' functionality, but that doesn't stop the halting. 

Ummmm... it doesn't?  Here's what I do in read_im.pro :

  ;
  ; Open the UDF access.  If it fails, bomb out nicely, and return scalar -1
  ;
  Catch, err_sts
  IF err_sts EQ 0 THEN BEGIN
    fh = udf_open(key, start_date, end_date, _Extra=_e)
  ENDIF ELSE BEGIN
    IF NOT quiet THEN print, !Error_State.Msg
    return, -1
  ENDELSE
  Catch, /Cancel

That has never given me a problem.

I'm sorry for not having coded UDF_OPEN() to return an invalid
filehandle (-1) on failure, instead of barfing.  It's probably
too late to change that, but if there's enough support out
there, it could be done.  Any comments?

^E