How to fix error done by pressing "Cancel" button

2012 1 18
3 个回答
回答已采纳
更新时间：2023 11 28
4 次查看（30 天）

0 个投票

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??

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 采纳的回答

Titus Edelhofer
Titus Edelhofer 2012-1-18

5 个投票

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

4 个评论
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Vlad Atanasiu
Vlad Atanasiu 2020-7-14
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
Walter Roberson 2020-7-17
You could also use isnumeric(filename)
Ivan Demec
Ivan Demec 2023-11-28
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
Titus Edelhofer 2023-11-28
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 :)

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更多回答（2 个）

Walter Roberson
Walter Roberson 2012-1-18

0 个投票

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?
Jethro
Jethro 2012-1-18

0 个投票

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!

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Walter Roberson
Walter Roberson 2012-1-18
Yes, always test the output of uiputfile(), uigetfile(), uigetdir(), uiputdir()

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