read-string
wayland/nextion/read-string
Read a text attribute of an object on the nextion display.
read-string
@/read-string
Read a text attribute of an object on the nextion display.
DEV@/nextion-serial
A nextion device.
CMDstring
Command. Specify object and attibute to be read. For example, t0.txt will read the text attribute of the object named t0.
UPDpulse
Update. Trigger read.
Donepulse
Pulse on read.
Stringstring
String.
C++ implementation
node {
CStringView view;
char* cStringOut;
void evaluate(Context ctx) {
// The node responds only if there is an input pulse
if (!isInputDirty<input_UPD>(ctx))
return;
// Get a pointer to the `EasyNex` class instance
auto eznex = getValue<input_DEV>(ctx);
auto xString = getValue<input_CMD>(ctx);
int N=length(xString) + 1;
char cString[N];
for(int i=0;i<N;i++)
cString[i]=0;
dump(xString, cString);
String str = eznex -> readStr(cString);
int strLen = str.length() + 1;
cStringOut = new char[strLen];
str.toCharArray(cStringOut, strLen);
view=CStringView(cStringOut);
emitValue<output_String>(ctx, XString(&view));
emitValue<output_Done>(ctx, 1);
}
}