how to execute stop(vid) when i close the imshow figure while running a while loop?

i am capturing images from a camera in real time and displaying the processed image in a while loop. As soon as I close the figure window, an error pops up. I want to execute stop(vid) after i close the figure and don't want the error to exist.

the error is as given below

Error using matlab.ui.Figure/set Invalid or deleted object.

Error in imshow (line 343) set(fig_handle, 'NextPlot', 'replacechildren')

Error in LiveDetector (line 40) imshow(imgOut);toc;

[Dilip Kunderu]

Looking at your post, the error is likely arising because the figure window is being closed before all the triggered instances of the callback function are processed, leading to the figure handle’s state becoming null for them. To avoid this, you can close the figure window after stopping the Image Acquisition and the associated cleanup.

If this is not the case, please post your code snippet here for further analysis.

[arun joshi]

is there a way to check figure handle while the loop is running. In that way i will be able to execute the stop(vid) command when the figure closes through an if loop.

[Mark Sherstan]

Did you try adding a GUI button instead? It would look something like this:

figureHandle = figure(1); 
StopButton = uicontrol('Style','pushbutton','String','Stop & Close','pos',[0, 0, 200, 25],'Callback','delete(gcbo)');
 
  while ishandle(StopButton)
   % Do something
  end

[zhuang Xu]

So have you solved this problem,bro ? How did you achieve that ?

@arun joshi

[Walter Roberson]

use the close request callback that I linked to . That is exactly the kind of purpose the callback was designed for.

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/matlab.ui.figure-properties.html#buiwuyk-1-CloseRequestFcn

use a callback to detect the close attempt .use it to stop the video before deleting the figure.