close all hidden problem

I want to close the invisible figure in an app, but after I use command: close all hidden, the apps are becomes 'invalid or deleted objects'

but according to this page: https://www.mathworks.com/help/matlab/ref/close.html

close all hidden will only close figures including invisible figures, not apps. so...is there any mistake with my operation?

Thanks!

Yu

[Kevin Chng]

Is there any infinite loop running in your apps?

https://www.mathworks.com/matlabcentral/answers/408608-error-invalid-or-deleted-object-when-close-a-gui-in-app-designer

[Yu Li]

no, it is at the beginning of a call back function in push-buttom in my app.

[Kevin Chng]

or try to delete the specific hidden figure in this way:

close(h)

name the figure as h, let see will it working fine or not.

[Yu Li]

the problem is that the name of figure handle is not clear, because it may be generated by some other function, it may be f1,f2,.....fn, or h1,h2....hn, etc.

[Kevin Chng]

Try

 figHandles = get(groot, 'Children');
 for i=1:1:length(figHandles)
       close(figHandles(i));
 end
 

If error is persistent, i believe there is something still running with the figures.

[Yu Li]

Thanks for your reply.

first I restart my Matlab to ensure that there is no figure applied.

then, I type:

h=figure(5);

figHandles = get(groot, 'Children')

below are all properties of figHandles:

Alphamap: [1×64 double]

BeingDeleted: 'off'

BusyAction: 'queue'

ButtonDownFcn: ''

Children: [0×0 GraphicsPlaceholder]

Clipping: 'on'

CloseRequestFcn: 'closereq'

Color: [0.9400 0.9400 0.9400]

Colormap: [64×3 double]

CreateFcn: ''

CurrentAxes: [0×0 GraphicsPlaceholder]

CurrentCharacter: ''

CurrentObject: [0×0 GraphicsPlaceholder]

CurrentPoint: [0 0]

DeleteFcn: ''

DockControls: 'on'

FileName: ''

GraphicsSmoothing: 'on'

HandleVisibility: 'on'

InnerPosition: [680 558 560 420]

IntegerHandle: 'on'

Interruptible: 'on'

InvertHardcopy: 'on'

KeyPressFcn: ''

KeyReleaseFcn: ''

MenuBar: 'figure'

Name: ''

NextPlot: 'add'

Number: 5

NumberTitle: 'on'

OuterPosition: [672 550 576 513]

PaperOrientation: 'portrait'

PaperPosition: [1.3333 3.3125 5.8333 4.3750]

PaperPositionMode: 'auto'

PaperSize: [8.5000 11]

PaperType: 'usletter'

PaperUnits: 'inches'

Parent: [1×1 Root]

Pointer: 'arrow'

PointerShapeCData: [16×16 double]

PointerShapeHotSpot: [1 1]

Position: [680 558 560 420]

Renderer: 'opengl'

RendererMode: 'auto'

Resize: 'on'

SelectionType: 'normal'

SizeChangedFcn: ''

Tag: ''

ToolBar: 'auto'

Type: 'figure'

UIContextMenu: [0×0 GraphicsPlaceholder]

Units: 'pixels'

UserData: []

Visible: 'on'

WindowButtonDownFcn: ''

WindowButtonMotionFcn: ''

WindowButtonUpFcn: ''

WindowKeyPressFcn: ''

WindowKeyReleaseFcn: ''

WindowScrollWheelFcn: ''

WindowStyle: 'normal'

there is no handle name called 'h', so how can I close it?

Thanks!'

Yu

[Stephen23]

"but according to this page: https://www.mathworks.com/help/matlab/ref/close.html close all hidden will only close figures including invisible figures, not apps"

I searched that page for the word "app" and it only occurs once in a link below the help itself. Why do you think that close does not apply to apps? I don't see that written anywhere on that page.

In any case, writing close all is a sledgehammer approach to writing code. While it might be fun and useful from the command line, coding something like that into any app, GUI, or function is like shooting yourself in the knee. Instead of writing such brutal, uncontrolled code, learn how to obtain and use explicit handles for all graphics objects that you use:

https://www.mathworks.com/help/matlab/graphics-objects.html

Once you learn to use graphics object handles then your code will be much more robust, reliable, and easier to debug.

[Yu Li]

Hi:

Please allow me some time to prepare a test app for you.

Thank you!

Yu

Answer 1

[Luna]

Did you type those inside a function or in the command window?

h=figure(5);
figHandles = get(groot, 'Children')

For example,

h=figure(5);
figHandles = get(groot, 'Children');
clear h  % clears the variable in the workspace
close(h) % h is deleted so it will obviously give an error. 

close(figHandles) % figHandles is an instance of figure object. This should close your figure even if you deleted h from the workspace. 
% be sure about which workspace you are working in. 

If you create your figure in a function and if the function does not include any close action, after that function executed, you can't close it because your workspaces has changed from "function workspace" to "base workspace". If this is your case, add an output value to your function which is the handle of your figure object. (in here it is "h").

Check out below link:

Functions, Inputs&Outputs

Also that might be useful:

You should read more about handle classes to understand what happens when you create an instance of an object.

Here is the link:

Handle Classes

[Yu Li]

Thank you luna, I think this resolve my question.

Bests,

Yu

[Luna]

Your welcome ;) Please accept answer if it works.