close a message box thru coding

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Elysi Cochin
Elysi Cochin 2012-11-8
评论： Nick Patterson 2023-3-9
how to close a message box displayed thru coding?... In my pjt to process an image it is taking time... so i displayed a message box saying "please wait'... now when the output is being displayed i wanted to close that message box automatically and then display the image.... what shud i do?

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Daniel Shub
Daniel Shub 2012-11-8
You could do something like
h = msgbox('please wait');
n = 0;
while rand > 1e-9; n = n+1; end;
delete(h);
Where the while loop is whatever processing that you want to do that takes a long time.

更多回答（2 个）

Image Analyst
Image Analyst 2012-11-8
I'd suggest a method that is robust enough to handle if the user clicked the OK button on your message box without throwing an exception:
handleToMessageBox = msgbox('Please wait...');
% Do stuff that takes a long time.....
if exist('handleToMessageBox', 'var')
delete(handleToMessageBox);
clear('handleToMessageBox');
end
Otherwise if the user clicked the OK button, as users tend to do, then when it hits your delete() function, the handle is already gone and it will throw an error (I tried it). My way avoids that error by not trying to delete the handle if it doesn't exist anymore.
Xingwang Yong
Xingwang Yong 2022-11-9
m = findall(0,'type','figure','tag','Msgbox_ ');
delete(m);
  1 个评论
Nick Patterson
Nick Patterson 2023-3-9
This works way better for my needs. I have non-modal message boxes that I need to display to the user, and I don't want them to close unless the user acknowledges them.
However, for my unit tests, I want to close them all programmatically. I just needed to slighly modify the above solution to work for me, where I find all figures, and then delete those whos tag contains "Msgbox" (which is necessary since there are multiple tags, but they all start with "Msgbox_").
% Close all msgbox instance
hv_figure_all = findall(0, 'Type', 'Figure');
delete( hv_figure_all( arrayfun(@(h) contains(h.Tag, 'Msgbox'), hv_figure_all) ) )

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