I've just write this code, hope it helps you. The value that the textarea returns is always a cell, so I put it in a for and parse it into a string and then use the function fprintf to write everything in a .txt file. The only problem is that, apparentely this function cannot add newlines to my .txt file, so I was thinking about print some special characters and then use some code to retrieve the text and add the newlines by coding.
Here I show you the code view of my matlab app.
classdef libreta < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
CargarnotaButton matlab.ui.control.Button
GuardarnotaButton matlab.ui.control.Button
MisnotasTextArea matlab.ui.control.TextArea
MisnotasTextAreaLabel matlab.ui.control.Label
end
properties (Access = private)
nombreArchivo = "miNota.txt"; % Description
end
methods (Access = private)
function guardaTexto(app)
%% escribiendo/creando archivo json
fid = fopen(app.nombreArchivo,"w");% w es de write, escritura
for i = 1:1:length(app.MisnotasTextArea.Value)
fprintf(fid,'%s',string(app.MisnotasTextArea.Value(i)));
end
fclose(fid);
end
function cargaTexto(app)
fid = fopen(app.nombreArchivo,"r"); % r es de read, lectura
app.MisnotasTextArea.Value = fscanf(fid,'%c');
fclose(fid);
end
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: GuardarnotaButton
function GuardarnotaButtonPushed(app, event)
guardaTexto(app);
end
% Button pushed function: CargarnotaButton
function CargarnotaButtonPushed(app, event)
cargaTexto(app);
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'MATLAB App';
% Create MisnotasTextAreaLabel
app.MisnotasTextAreaLabel = uilabel(app.UIFigure);
app.MisnotasTextAreaLabel.HorizontalAlignment = 'right';
app.MisnotasTextAreaLabel.Position = [208 413 56 22];
app.MisnotasTextAreaLabel.Text = 'Mis notas';
% Create MisnotasTextArea
app.MisnotasTextArea = uitextarea(app.UIFigure);
app.MisnotasTextArea.Position = [274 147 327 288];
% Create GuardarnotaButton
app.GuardarnotaButton = uibutton(app.UIFigure, 'push');
app.GuardarnotaButton.ButtonPushedFcn = createCallbackFcn(app, @GuardarnotaButtonPushed, true);
app.GuardarnotaButton.Position = [41 403 100 22];
app.GuardarnotaButton.Text = 'Guardar nota';
% Create CargarnotaButton
app.CargarnotaButton = uibutton(app.UIFigure, 'push');
app.CargarnotaButton.ButtonPushedFcn = createCallbackFcn(app, @CargarnotaButtonPushed, true);
app.CargarnotaButton.Position = [41 341 100 22];
app.CargarnotaButton.Text = 'Cargar nota';
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = libreta
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
