How to prompt an error message box if no image is selected? (App Design)

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Cyrick Elegado
Cyrick Elegado 2020-3-27
回答： Divya Yerraguntla 2020-3-30
I have an image processing project that I am currently working on. I would like to display a message box prompting an "error" if the user fails to select an image. As in:
The user selects load image, and if the user decides to exit out of the selection, an error message is shown. Thanks.
  1 个评论
Tommy
Tommy 2020-3-28
file = 0;
while ~file
[file, path] = uigetfile;
if ~file
waitfor(msgbox('Pick a file.'))
end
end
disp([path file])
This will bring up a dialog box for selecting a file, and if the user clicks 'Cancel' it will display another box that says 'Pick a file.' Once they close that box, it will again prompt them to pick a file. Only after they pick a file will the code continue past the while loop. Is this similar to what you are looking for?

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回答（1 个）

Divya Yerraguntla
Divya Yerraguntla 2020-3-30
Hi Cyrick,
You could use the below model code to achieve your purpose:
[file,path] = uigetfile; % Open file selection dialog box
if isequal(file,0)
f = errordlg('Must pick a file'); % If cancel button is pressed Error pops up
end
Have a look at uigetfile and errordlg for more information about these functions.
Hope it helps!

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