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Check if GUI is open

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Pollok Tim
Pollok Tim el 21 de Sept. de 2016
Respondida: Kristoffer Walker el 21 de Oct. de 2020
Hi everybody
I believe the answer to this question already exists several times online, but everything I tried failed.
I got in a GUI-figure the option to open an other GUI-figure. In the second GUI I got plots and the first one can update these plots. Therefore its interesting to know if the second GUI is already/still open when I activate the update.
I tried:
~isempty(findobj('Tag','figure2'))
~isempty(findobj('Tag','axesInFigure2'))
~isempty(get(groot,'figure2'))
isgraphics(h,'figure2')
but I get the same result no matter if figure2 is open or not.
Is there an other way to get this information? I think of eventlisteners: figurehasbeenopened, figurehasbeenclosed
Thanks for help.

Respuesta aceptada

Adam
Adam el 21 de Sept. de 2016
Editada: Adam el 21 de Sept. de 2016
Keep hold of the handle of the figure when you launch it.
Then just do a
if ishghandle( otherFigureHandle )
or
if isgraphics( otherFigureHandle )
test when you want to see if it is open or not.
  2 comentarios
Pollok Tim
Pollok Tim el 21 de Sept. de 2016
Thanks a lot, now its running.
-Keep hold of the handle of the figure when you launch it.-
I understood that I get the handle of figure2 in its own openingFcn like this
% Get handle of figure2
figure2 = findobj('Type','figure','name','figure2');
% Saves figure2 for access in other .m-files
setappdata(0,'figure2',figure2);
And when I check if its open I use
% Get access to figure2
hfigure2 = getappdata(0,'figure2 ');
% either isgraphics() or ishghandle()
isgraphics(hfigure2);
ishghandle(hfigure2);
Both functions seem to work.
Adam
Adam el 21 de Sept. de 2016
It depends where you are launching it from. I never use findobj myself (well, rarely) because I keep hold of all my handles if I need them in the future as e.g.
hFig = MyGUI(...)
to launch a GUI named MyGUI.
Then later on I can just use hFig. I can't tell from your question whether you mean you have a custom-made figure (e.g. from GUIDE) or whether you mean just a standard launched figure.
I would not recommend using
setappdata( 0,... )
generally, especially with common names like 'figure2', but if it works then ok. I don't use setappdata most of the time, but if I do I attach my data to a specific figure handle rather than the root object to keep it linked to the specific application.

Iniciar sesión para comentar.

Más respuestas (4)

Benjamin Avants
Benjamin Avants el 17 de Oct. de 2017
I know this question is old, but GUIDE created figures don't show up as results from findobj.
Instead, use
figure2handle = findall(0,'Tag','figure2');
if ~isempty(figure2handle)
% figure exists
end

Vahab Youssofzadeh
Vahab Youssofzadeh el 2 de Jun. de 2017
Editada: Vahab Youssofzadeh el 2 de Jun. de 2017
Here's another solution:
h = get(0, 'Children');
isempty(findobj(h,'name','NAME OF THE GUI'));
% isempty (findobj (h,'tag','NAME OF THE GUI'));

Nepenthes
Nepenthes el 17 de Jul. de 2018
This is a little late, but I chanced upon this solution when tackling a similar problem. H.isvalid or isvalid(H) should work. H can be a single handle, or a vector of handles. K>> H = figure; K>> G = plot(rand(5)); K>> delete(G(3:4)); K>> G.isvalid ans = 1 1 0 0 1 K>> H.isvalid ans = 1 K>> delete(H) K>> H.isvalid ans = 0

Kristoffer Walker
Kristoffer Walker el 21 de Oct. de 2020
None of the above seems to work for me when I am trying to detect if a GUI created from AppDesigner is open. Does anyone know how to do this with AppDesigner GUI's?
Best regards,
Kris

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