[rrd-users] Using RRDTool in C App - Graph not being produced nut no error
travislspencer at gmail.com
Mon Feb 26 18:41:14 CET 2007
On 2/25/07, Mark Easton <mark.easton at azurebell.co.nz> wrote:
> But when I create the graph image I get no errors and no image file is
> sprintf(argstr, "temp.png --start %ld --end %ld
> DEF:mytemp=gopher.rrd:temp:MAX", (long)seconds1, (long)seconds2);
I think it is because you don't have a PRINT or GPRINT statement.
Try this and see if it works:
sprintf(argstr, "temp.png --start %lu --end %lu"
"GPRINT:min:MAX:Max Temperature %%8.3lf %%s",
Note that the double percent signs are for sprintf not RRD. I would
suggest that you get things to work w/ RRDTOOL from the command line
first. Then, write the C code.
More information about the rrd-users