[rrd-users] [newbie] not a valid vname

[Mark Probert]

Hi ..

I am not sure if this is the right forum (it is an API question), but
here goes ..

I am developing an RRDtool binding for Ruby (the existing one is rather
stale).  Things are going fine, however, I am having a problem with
rrd_graph().  When I feed it the following (version of minmax.pl):

  name = "minmax"
  rrdname = "#{name}.rrd"
  rrd.graph(
   "#{name}.png",
    "DEF:a=#{rrdname}:ds_0:AVERAGE",
    "DEF:b=#{rrdname}:ds_0:MIN",
    "DEF:c=#{rrdname}:ds_0:MAX",
    "--title", " #{name} Demo", 
    "--start", "now",
    "--end", "start+1d",
    "--lower-limit=0",
    "--interlace",
    "--imgformat","PNG",
    "--width=450",
    "AREA:a#00b6e4:real",
    "LINE1:b#0022e9:min",
    "LINE1:c#000000:max")

I get the error:

  minmax.rb:41:in `graph': Not a valid vname: a in 
    line AREA:a#00b6e4:real (RRDtoolError)
        from minmax.rb:41 

Being an RRDtool newbie, I am not really sure what that means :-| Any
help would be appreciated.

(BTW, this doesn't appear to be a problem with parameter passing as
rrd_create() etc. seem to be working okay.  However, is there any way of
finding out what rrd_graph() is actually getting?)

TIA,

-- 
-mark.  (probertm at acm dot org)

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