How to fix error done by pressing "Cancel" button

Hi everybody!

I wrote a simple function to save my axes using saveas funct. but if I click on "Cancel" in the opened window, I have an error in my Matlab... There's a way to interrupt the operation of saving if users press "Cancel" without an error??

Answer 1

[Titus Edelhofer]

Hi,

the uiputfile dialog returns 0 for the filename if the user presses cancel:

filename = uiputfile;
if filename==0
  % user pressed cancel
  return
end
% go on with saving your data ...

Titus

[Vlad Atanasiu]

You could also catch if the output is a list of files (= characters) or the cancel keypress (= 0 = numerical).

filename = uiputfile;
if isa(filename,'double')
    return
end

Cheers.

PS: Can uiputfile/uigetfile output other codes than "0"? (Maybe not today, but tomorrow.)

[Walter Roberson]

You could also use isnumeric(filename)

[Ivan Demec]

Hello @Titus Edelhofer,

Your answer breaks the code if you use the multiselect option of the UIgetFile i.e.,

Undefined function 'eq' for input arguments of type 'cell'.

@Walter Roberson your solution works with multiselect. Thank you

[Titus Edelhofer]

Interesting coincidence: I wrote the answer a decade ago, and most often still use the filename==0 test. Believe it or not, just about 2 weeks ago I stumbled across my own solution not working (anymore) in case of multiselect :)

Answer 2

[Walter Roberson]

Sorry, Cancel in which window exactly? And do you mean Cancel or do you mean the window close button? saveas() itself does not have a Cancel. If you are referring to something like a callback initiated from a window, have you considered setting the Cancel button to 'enable', 'off' during the time the saveas operation is going on?

Answer 3

[Jethro]

I write you my code, maybe it can help you to understand my situation...

function PB_S_G_Callback(hObject, eventdata, handles)
F=getframe(handles.G1_Grafico); %select axes in GUI
  global fout
  [fout path]=uiputfile({'*.png'; '.bmp'; '.jpg'; '.gif'; '.tiff'})
  global fpath
  fpath = strcat(path, fout);
  a=saveas(gcf, fpath);

I want to use this code to save my plots (the callback name means Pushbutton to Save Plots): When opening my "save window", I can press OK (to save) or CANCEL (to cancel operation)... If I press CANCEL, Matlab shows me an error...

EDIT: I solved with Titus code, now it works correctly!!

function PB_S_G_Callback(hObject, eventdata, handles)
F=getframe(handles.G1_Grafico); %select axes in GUI
  global fout
  [fout path]=uiputfile({'*.png'; '.bmp'; '.jpg'; '.gif'; '.tiff'})
  if fout==0
      return
  end
  global fpath
  fpath = strcat(path, fout);
  a=saveas(gcf, fpath);

THANKS A LOT!

[Walter Roberson]

Yes, always test the output of uiputfile(), uigetfile(), uigetdir(), uiputdir()