How to set out put files to save at user selected path?

Question

adi kul 2016-6-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/287935-how-to-set-out-put-files-to-save-at-user-selected-path

回答： Stephen23 2016-6-7

Hello All, This question is in continuation with following question: http://in.mathworks.com/matlabcentral/answers/287928-select-a-folder-to-save-output-files

Now from above answer I was able to set and select the output folder but I am not able to save the files in there.

Here is what I tried. The following code is below the push button:

input = get(hObject,'String');
%checks to see if input is empty. 
if(isempty(input))
  h=msgbox('Please select the output folder');
end
guidata(hObject, handles);
selected_dir = uigetdir();
set(handles.edit27, 'String', selected_dir)

Now in my another push button where the calculations happen, I want to save the output images in above selected path. So this is what I have done. The following is the code which I am having the calculation push button callback:

saveas(gcf,fullfile(selected_dir,1),'jpg');
close(gcf);

I am getting following error.

Undefined function or variable 'selected_dir'.

What I want is to save 1.jpg as output file in user selected folder. Also I want to display "Please select out put folder" message if user forgets to select it.

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Answer 1

Weird Rando 2016-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/287935-how-to-set-out-put-files-to-save-at-user-selected-path#answer_224588

编辑：Weird Rando 2016-6-6

You have to set selected_dir as a global variable so that other section of the gui can access it.

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Stephen23 2016-6-7

编辑：Stephen23 2016-6-7

@Weird Rando: and I'm just pointing out why using globals is universally considered a bad way to write code. I didn't invent this idea: even the official MATLAB blogs give the advice to avoid using globals!

If you ask for advice from someone, which information would you prefer to be given:

a reliable and robust solution, or
a solution that is avoided by all experts ?

I know which one I would want to learn.

In any case my comment written not just for you, but also for anyone who reads this page and who should be informed that globals are a buggy and slow solution. They deserve to know this: would you expect to find good advice on MATLAB Answers, or buggy advice? Which would you want to use?

Muhammad Usman Saleem 2016-6-7