Update textarea when printing to the console

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John F 2022-4-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1699705-update-textarea-when-printing-to-the-console

编辑： John F 2022-4-19

I have an app where I have setup a diary to store the outputs to the console to a file. In this app, I have a text area that I would like to update its Value whenever something is printed to the console. For example, this app uses a Simulink model that outputs diagnostics to the console if something went wrong.

How could I go about this? Is there perhaps any event listener that I could use?

app.dfile = 'app_log.txt';
if exist(app.dfile, 'file') 
    delete(app.dfile); 
end
diary(app.dfile)
diary on
cons_tab = uitab(PlotTabGroup,'Title','Console'); % PlotTabGroup is a TabGroup with multiple tabs
cons_txt = uitextarea(cons_tab,'Value',fileread(app.dfile),...
    'Position',[0 0 cons_tab.Position(3) cons_tab.Position(4)],...
    'Tag','console');

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Eric Delgado 2022-4-19

myApp_1699705.mlapp

Hi @John F, you could create a timer object in the startup of your app. See atached!

Hope it helps! :)

% Startup

function startupFcn(app)

diary('app_log.txt')

diary on

app.tmr = timer("ExecutionMode", "fixedDelay", ...

"Period", 10, ...

"TimerFcn", @(~,~)timerCallback(app));

start(app.tmr)

end

% Callback

function timerCallback(app)

try

app.Log.Value = fileread('app_log.txt');

catch ME

uialert(app.UIFigure, ME.message, 'Error', 'Icon', 'error')

end

John F 2022-4-19

编辑：John F 2022-4-19

在 MATLAB Online 中打开

@Eric Delgado This works but if someone finds something that doesn't involve a timer that would be better. Also, if someone uses this in the future, you also need to remove the timer at the end or it will remain even if the app is closed: