Experimental Physics and
Industrial Control System

[email protected] (Jeff Hill) · Fri, 23 Feb 96 11:46:18 MST

hello all,

I am thinking that we should add display arguments declaration to
"modify display attributes" in edd. This would be a single
parameter with the following syntax:

"<arg0> {= <default>} , <arg1> {= <default>} , ..."

example:

"BPMNO = 1, SECTOR = blue, BLDG"

In this case when starting the display if they dont specify a value
for the macro "BPMNO" then the value assigned will be "1". If they 
dont specify "SECTOR" then the value "blue" will be assigned.
If they dont specify "BLDG" then they will be prompted for this
argument via a dialog box.

For backwards compatibility (and convenience) if the display
arguments declaration isnt provided (is empty) then dm would continue
to operator as it does today (without argument checks).

I see three main advantages to this approach:
o better error messages if the arguments are over/under specified
o optional defaults for arguments (allows adding new arguments to a display
without breaking preexisting callers of the display)
o the possibility of prompting for missing arguments via a dialog box

Jeff

______________________________________________________________________
Jeffrey O. Hill			Internet	[email protected]
LANL MS H820			Voice		505 665 1831
Los Alamos, NM 87545 USA 	FAX		505 665 5107

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System