[rrd-users] getting MAX, LAST VDEFs without generating graph from C library

Jack Tavares j.tavares at F5.com
Wed Feb 13 12:18:14 CET 2008

Hello all
I have some existing rrdfile with some data in them.
I was reading  about the VDEF capabilities of the rrdgraph
I am using the c library functions to manipulate the rrd files.
I want the MAX and LAST from a graph, but I don't want the graph.
At the command line I would do:
rrdtool graph xy.png -aPNG
VDEF:connsmax=curclientconns,MAXIMUM VDEF:connslast=curclientconns,LAST
PRINT:connslast:"last=%12.0lf" PRINT:connsmax:"max=%12.0lf"
This prints to stdout.
If I am calling rrd_graph() C function, how do I get this data? 
Is there a better way to do this? I m very open to suggestions, but I
have to stick with the C library calls.
Ok, one more question:
I dont see any API docs for theC library on the web site. Are there any?
Thanks again

Jack Tavares
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