get-number
wayland/esp32-preferences/get-number
Retrieve specified number from currently open namespace. If record does not exist, the Num pin will output NaN.
get-number
@/get-number
Retrieve specified number from currently open namespace. If record does not exist, the Num pin will output NaN.
Prefs@/preferences
A preferences object.
Keystring
Key name. Limited to 15 chars.
UPDpulse
Update
Donepulse
Pulse on read.
Numnumber
Number retrieved from storage or NAN if key not found.
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_UPD
node {
void evaluate(Context ctx) {
// The node responds only if there is an input pulse
if (!isInputDirty<input_UPD>(ctx))
return;
auto prefs = getValue<input_Prefs>(ctx);
auto xStringKey = getValue<input_Key>(ctx);
int N=length(xStringKey);
if (N>15 || N<1) {
raiseError(ctx);
return;
}
N +=1;
char cStringKey[N];
for(int i=0;i<N;i++)
cStringKey[i]=0;
dump(xStringKey, cStringKey);
float number = prefs -> getFloat(cStringKey, NAN);
emitValue<output_Num>(ctx, number);
emitValue<output_Done>(ctx, 1);
}
}