begin
wayland/esp32-preferences/begin
Opens storage with specified namespace. If RO (read only) is set to false, then storage will be opened in read/write mode. If namespace does not exist, then it will be created if RO is set to False. If namespace does not exist and RO is set to True, then the node will raise an error.
begin
@/begin
Opens storage with specified namespace. If RO (read only) is set to false, then storage will be opened in read/write mode. If namespace does not exist, then it will be created if RO is set to False. If namespace does not exist and RO is set to True, then the node will raise an error.
Prefs@/preferences
A preferences object.
Namestring
Namespace name. Limited to 15 chars.
ROboolean
Open storage read only.
UPDpulse
Update.
Donepulse
Pulse when namespace opened.
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 xStringName = getValue<input_Name>(ctx);
auto ro = getValue<input_RO>(ctx);
int N=length(xStringName);
if (N>15 || N<1) {
raiseError(ctx);
return;
}
N +=1;
char cStringName[N];
for(int i=0;i<N;i++)
cStringName[i]=0;
dump(xStringName, cStringName);
if (!prefs -> begin(cStringName, ro)) {
raiseError(ctx);
return;
}
emitValue<output_Done>(ctx, 1);
}
}