opcdata_get_double()
#include opcapi.h
double *opcdata_get_double(
const opcdata
data, /* in */
int attribute /* in */
);
Parameters
data- HPOM data structure containing the queried attribute.
attribute- Specifies the attribute that is queried.
Description
The function opcdata_get_double() returns the value
of a double attribute in data.
Return Values
Returns the real value, or, OPC_DOUBLE_UNDEF if no
value could be retrieved because data was empty or
attribute was not allowed. Note that the real value
could also be OPC_DOUBLE_UNDEF.
If an error occurs, for example an invalid attribute is
specified, the function returns 0.0..
Versions
HPOM for Windows A.07.50 and later
See Also