Echelon ISI - Manual (Page 148)

ISI Programmer’s Guide 146
IsiGetNextNvIndex()
unsigned IsiGetNextNvIndex(unsigned Assembly , unsigned Offset , unsigned
Previous );
Returns the network variable index of the network variable at the specified offset
within the specified assembly, following the network variable specified by the
Previous index. Returns ISI_NO_INDEX if there are no more network variables,
or a valid network variable index 1– 254 otherwise. The Offset parameter is
zero-based and relates to the selector number Offset within the assembly that is
used with the enrollment of this assembly.
This function is a forwarder to isiGetNextNvIndex().
The isiGetNextNvIndex() forwardee always returns ISI_NO_INDEX.
Applications may override IsiGetNextNvIndex() to map multiple local network
variables to a single network variable selector. The ISI application is responsible
for observing the various binding and protocol limitations when using this
feature.
The isiGetNextNvIndex() forwardee assumes the default assembly numbering
scheme that is described in Assembly Number Allocation earlier.
Applications overriding IsiGetNextNvIndex() should also override
IsiGetNvIndex().
This function operates whether the ISI engine is running or not.
IsiGetNvIndex()
unsigned IsiGetNvIndex(unsigned Assembly , unsigned Offset );
Returns the network variable index 0 – 254 of the network variable at the
specified offset within the specified assembly, or ISI_NO_INDEX if no such
network variable exists. This function must return at least one valid network
variable index for each assembly number returned by IsiGetAssembly() and
IsiGetNextAssembly(). The
Offset parameter is zero-based and relates to the
selector number Offset that is used with the enrollment of this assembly.
This function is a forwarder to isiGetNvIndex().
The isiGetNvIndex() forwardee returns Assembly + Offset .
The isiGetNvIndex() forwardee assumes the default assembly numbering scheme
that is described in Assembly Number Allocation earlier.
Applications overriding IsiGetNvIndex() should also override
IsiGetNextNvIndex().
This function operates whether the ISI engine is running or not.