How check in App Designer if a secondary App is already open?

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Eros 2024-6-27

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评论： Eros 2024-6-28

Hello,

in App Designer I have two Apps: a MainApp and a SecondaryApp.

I set a PushButton1 in the MainApp that calls the SecondaryApp, opens it, here I set the parameters I want and, by pressing a PushButton2 (in the secondary app), I close the SecondaryApp and send the chosen parameters to the MainApp.

How can I check inside MainApp if the SecondaryApp is already open and close it?

Because now I risk opening the SecondaryApp multiple times.

The problem is that when I work in the MainApp I have no visibility on the secondary and, furthermore, I cannot simply disable the PushButton1 with which I call the secondary in the MainApp because the button would remain deactivated when I manually close the SecondaryApp window without using the PushButton2 for sending parameters.

Thanks

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Answer 1

Eros 2024-6-28

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Solved! searching through the settings, I discovered that it is possible to set directly in App Designer the unique instance for each single App: this therefore allows you not to open the same App multiple times, but to have only one App (Secondary App, in my case) open.

Exactly what I was looking for, simply by enabling a check box in settings.

Here is what to do for those who find themselves in the same problem as me:

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Answer 2

Matlab Pro 2024-6-27

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在 MATLAB Online 中打开

Hi @Eros

Here is a simple function I have created a simple function that can help you

function hApp = getapp(appName)
hApp = [];
hFigs = findall(0,'type','figure');
if ~isempty(hFigs)
   idx = ismember({hFigs.Name},appName);
   hApp = hFigs(idx);
end

You call it with an app name (as apeared on teh main figure.

If it is NOT up - it will renturn an empty handle

Otherwise - it will return a handle to this app

Examples:

hApp = getapp('SecondaryApp')

or...

hApp = getapp('MATLAB App')
hApp = 
  Figure (MATLAB App) with properties:
      Number: []
        Name: 'MATLAB App'
       Color: [0.9400 0.9400 0.9400]
    Position: [100 100 640 480]
       Units: 'pixels'

Hope this helps..

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Matlab Pro 2024-6-27

well. I have uploaded a little improved version to the XExchange server

https://www.mathworks.com/matlabcentral/fileexchange/168921-getapp

Eros 2024-6-28

Hello, thank you very much for the good trick.

However, searching through the settings, I discovered that it is possible to set directly in App Designer the unique instance for each single App: this therefore allows you not to open the same App multiple times, but to have only one App (Secondary App, in my case) open.

Exactly what I was looking for, simply by enabling a check box in settings.

I added a comment with the screenshot of the setting

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