What means "MATLAB connector is not running"?

I have a GUI app that runs fine under MATLAB, however when compiled as standalone with MCC, I get a strange warning message

"warning: MATLAB connector is not running." when doing zooming my graphics.

There are very little info I can find on this warning. Can anyone help to point me to the possible cause.

Here is a screen shot of the command window:

Answer 1

[Yukta Maurya]

The below link can be followed for reference -

https://www.mathworks.com/matlabcentral/answers/preview/ka03q0000019fR7AAI

[Walter Roberson]

We do not have access to preview

[Yukta Maurya]

Title

Why do I receive the warning "Warning: MATLAB Connector is not running" for my standalone application in MATLAB R2021a?

Question

For a custom application, the following warning messages appear in the command window, both within MATLAB environment as well as in the compiled application using MATLAB Compiler,

> In message.publish
In matlab.graphics.internal/FigureToolstripManager/updateActions (line 23)
In matlab.uitools.internal.FigureToolManager>locUpdateUndoUI (line 78)
In matlab.uitools.internal.FigureToolManager>locCommandStackChanged (line 58)
In matlab.uitools.internal.FigureToolManager>@(o,~)locCommandStackChanged(o,hThis) (line 45)
In matlab.uitools.internal.uiundo/CommandManager/add
In uiundo (line 26)
In zoom>localCreate2DUndo (line 1823)
In zoom>localZoomFactor2D (line 988)
In zoom>localApplyZoomFactor (line 853)
In zoom>localButtonWheelFcn (line 895)
In zoom>@(obj,evd)localButtonWheelFcn(obj,evd,hMode) (line 552)
In uiwait (line 81)
In Bueno (line 50)
Warning: MATLAB Connector is not running.

Why do I receive the warning "Warning: MATLAB Connector is not running" for my standalone application in MATLAB R2021a?

Answer

The issue was not reproducible in our side. However, adding the following line of code,

connector.ensureServiceOn;

before the call to function 'uiwait' the warning disappeared for the customer.

[Bruno Luong]

In my case it is not clear if there is an uiwait.

However it happens that I define my own ActionPostCallback of zoom and pan objects

zoomh = zoom(figh);
panh = pan(figh);
pan(figh,'off');
set(zoomh, 'ActionPostCallback', @CurvePreview_ZoomPostCallBack);
set(panh,  'ActionPostCallback', @CurvePreview_ZoomPostCallBack);

I figure out to turn off the warning by

warning('off','MATLAB:connector:connector:ConnectorNotRunning');

I'll try to replace it with

connector.ensureServiceOn; 

to see how it goes