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How do I update a GUI designed in App Designer with data from a running Simulink model?

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I want to update a GUI that I have designed in App Designer using data that is generated during the simulation of a Simulink model. In other words, how do I access run-time parameters of a Simulink model from App Designer?


MathWorks Support Team
MathWorks Support Team 2020 年 8 月 10 日
Let the Simulink model being used be named "Trial.slx" and the App Designer app being used be named "TrialApp.mlapp". There are three steps involved in accessing run-time parameters of a Simulink model from App Designer. They are listed below:
1. In the Simulink model callback "InitFcn" function, define:
hApp = TrialApp;
2. In the Simulink model callback "StartFcn" function, call a function named "updateGUI()" as described below. This method will be called every time the specified block's ("blk") output method executes.
blk = 'Trial/DisplayBox';
event = 'PostOutputs';
listener = @(app, event) updateGUI(hApp);
h = add_exec_event_listener(blk, event, listener);
3. Create a public method named "updateGUI()" in the app designed in App Designer. This function will get the specified block's run-time parameters and pass it to the GUI. This function is defined below.
function updateGUI(app, varargin)
% Create an object that gets the run-time value of the specified block
rto = get_param([bdroot,'/DisplayBox'],'RuntimeObject');
% Update the GUI accordingly. In this case a the value of an EditField is being updated.
app.EditField.Value = rto.InputPort(1).Data;
  3 件のコメント
Alireza Ghaderi
Alireza Ghaderi 2020 年 8 月 23 日
I followed your instruction and created a event listener. My simulink model is a real time data gathering from a serial device with the rate of 100Hz. After using this method, My Simulink model is not real time and has a huge delay... Also I didnt get the value in app as well...


その他の回答 (2 件)

Serhiy Kapustyan
Serhiy Kapustyan 2021 年 2 月 23 日
Hello the Problem is that if i define a start button and run the simulation, then Gui opens each time the simulation starts! What to do in this case?
  2 件のコメント
alexander schlegel
alexander schlegel 2021 年 6 月 23 日
Hi Thiviya,
I have the same problem. Is there a solution yet?
Best regards


Nancy 2021 年 6 月 7 日
Does it make a difference whether the definition "hApp = TrialApp;" goes int InitFcn or in StartFcn? I'm not clear on what the two callbacks are doing, since the names sound like they are doing the same thing. The reason I ask is that I have to use a third-party toolbox that overwrites the contents of InitFcn everytime the model is re-started, but the interface with the app appears to work correctly if I move the definition of hApp into StartFcn.
In other words, why do you put the definition of hApp in InitFcn, and what's the difference between InitFcn and StartFcn?




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