I am working in Visual Studio 2005. My code creates the gopher.rrd file and
updates data successfully. When I do a fetch I am returned some data, so all
good. But when I create the graph image I get no errors and no image file is
created. I am trying to learn RRDTool, but this is confusing me. Any
pointers would be appreciated.
This is the main code:
int ret;
int ret_2;
time_t seconds1, seconds2;
char argstr[200];
seconds1 = time (NULL) - 100;
sprintf(argstr, "gopher.rrd --start %ld --step 300
DS:temp:GAUGE:1200:U:U
RRA:MAX:0.5:1:576", (long)seconds1);
ret = wrap_rrd_create( argstr);
if (ret != -1)
{
test_interfacekit();
seconds2 = time (NULL);
sprintf(argstr, "gopher.rrd MAX --start %ld --end %ld",
(long)seconds1,
(long)seconds2);
ret_2 = wrap_rrd_fetch( argstr);
if (ret_2 == -1)
printf("RRD error fetching: %s\n", rrd_get_error());
sprintf(argstr, "temp.png --start %ld --end %ld
DEF:mytemp=gopher.rrd:temp:MAX", (long)seconds1, (long)seconds2);
ret_2 = wrap_rrd_graph( argstr);
if (ret_2 == -1)
printf("RRD error creating temp.png: %s\n",
rrd_get_error());
}else
printf("RRD error creating gopher.rrd: %s\n", rrd_get_error());
The method test_interfacekit() receives data from a temperature sensor and
updates it into the RRD. The call back method does this:
time_t seconds;
char str[200];
int ret;
if (Index == 0)
{
seconds = time (NULL);
printf("Time is %ld\n", (long)seconds);
sprintf(str, "gopher.rrd %ld:%d", (long)seconds, (int)Value);
ret = wrap_rrd_update( str);
if (ret == -1)
printf("RRD update error: %s\n", rrd_get_error());
}
printf("Sensor %d is %d\n", Index, Value);
return 0;
--
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http://www.nabble.com/Using-RRDTool-in-C-App---Graph-not-being-produced-nut-no-error-tf3288407.html#a9146991
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