On Thu, Nov 13, 2003 at 10:42:37AM +0100, Pitisi wrote:
Hi Didier.
> Did somebody ever used the function rrd_graph in a C program?
Not yet.
> If yes, can you describe the meaning of the different parameters
> (rrdtool 1.0.41):
> int rrd_graph(int, char **, char ***, int *, int *);
Sure:
There meanning is the following:
int - Argument counter (argc)
char** - Array of arguments (argv[])
char *** - Pointer to the array, holding the picture
int * - Pointer which stores the width of the picture
int * - Pointer which stores the height of the picture
One note about the char *** ...
You don't have to allocate memory for the picture data.
If you pass a NULL pointer instead, rrd_graph will
calloc() it for you. Usually you can't allocate the memory
before calling rrd_graph, because you don't know the
size of the picture.
e.g.:
[... snipp ...]
int rrd_ret=0;
int x=0;
int y=0;
int rrd_argv=0;
char **rrdargv=NULL;
char **mypic=NULL;
/*
* define and fill int rrd_argc and rrd_argv ...
* ... lines later
*/
rrd_ret=rrd_graph(rrd_argc,rrd_argv,&mypic,&x,&y);
if (rrd_ret==0)
{
printf("Got a picture: W=%d ; H=%d\n",x,y);
}
[... snipp ...]
It's easy.
HTH ... Andreas.
P.S.: Don't forget to free() the memory allocated by rrd_graph :-)
--
Dipl.-Ing. Andreas Maus science+computing ag
System Administration Hagellocher Weg 71-75
mail: [EMAIL PROTECTED] 72070 Tuebingen, Germany
tel.: +49 7071 9457 456 www.science-computing.de
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