| Pintaudi Giorgio wrote: | Hello!
Just a little question about the ODB hotlinks. Is it possible to open a hotlink
to a single element in and ODB array? |
Yes it is with the now preferred function db_watch(). Following program will open a hot link to the /Experiment/Run number:
#include <stdio.h>
#include "midas.h"
int run_number;
void run_number_changed(HNDLE hDB, HNDLE hKey, int i, void *info)
{
int run_number, size;
/* get run number */
size = sizeof(run_number);
db_get_data(hDB, hKey, &run_number, &size, TID_INT);
printf("Run number is %d\n", run_number);
}
main()
{
HNDLE hKey;
/* connect to experiment */
cm_connect_experiment("", "", "ODB Test", NULL);
/* open hot link to run number */
db_find_key(1, 0, "/runinfo/run number", &hKey);
db_watch(1, hKey, run_number_changed, NULL);
/* enter idle loop */
while (cm_yield(1000); != RPC_SHUTDOWN);
cm_disconnect_experiment();
return 1;
} |