How to check if one file selected when using MultiSelection in matlab?

Question

Eslam Hamed 2015-12-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/258849-how-to-check-if-one-file-selected-when-using-multiselection-in-matlab

评论： Ahmed Harun-Al-Rashid 2016-11-4

I have a function that allow user to browse and choose some images like this

    [filename, pathname, filterindex] = uigetfile( ...
    {  '*.jpg;*.jpeg;*.png','Images (*.jpg, *.jpeg, *.png)'; ...
       '*.*',  'All Files (*.*)'}, ...
       'Choose Class 1 DataSet', ...
       'MultiSelect', 'on');

And I take the browsed images in a cell array

ChosenImages = strcat(pathname,filename);

Now I have a problem, if the user entered one image only, it doesn't return this image as one cell, it return each character as cell, and when I use

length(ChosenImages);

it returns the number of chars in the link!

also I tried

ischar(ChosenImages{1})

to check if one cell is a cell or not but it gives me an error too.

What can I do to check if the user chosen one image or multiple images?

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Answer 1

Guillaume 2015-12-4

8
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https://ww2.mathworks.cn/matlabcentral/answers/258849-how-to-check-if-one-file-selected-when-using-multiselection-in-matlab#answer_202168

在 MATLAB Online 中打开

<rant> This is a thing I hate about the way mathworks design their language. All these special cases where a function behaves differently (when n = 1 or when n is vector, or...). It hurts genericity and force you to write 'ifs' all over the place when you're expecting to cope with both the general case and the exception. And it's doubly frustrating as they must have the same if pattern in the function you call to generate that exceptional case in the first place <end rant>

To fix the problem, simply convert the exceptional case back to the generic case with:

   [filename, pathname, filterindex] = uigetfile( ...
    {  '*.jpg;*.jpeg;*.png','Images (*.jpg, *.jpeg, *.png)'; ...
       '*.*',  'All Files (*.*)'}, ...
       'Choose Class 1 DataSet', ...
       'MultiSelect', 'on');
  if ~iscell(filename)
    filename = {filename};
  end %now filename is a cell array regardless of the number of selected files.

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Eslam Hamed 2015-12-4

Thank you a lot it works :)

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Answer 2

Walter Roberson 2015-12-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/258849-how-to-check-if-one-file-selected-when-using-multiselection-in-matlab#answer_202177

在 MATLAB Online 中打开

[filename, pathname, filterindex] = uigetfile( ...
  {  '*.jpg;*.jpeg;*.png','Images (*.jpg, *.jpeg, *.png)'; ...
     '*.*',  'All Files (*.*)'}, ...
     'Choose Class 1 DataSet', ...
     'MultiSelect', 'on');
 filename = cellstr(filename);
 %now filename is a cell array regardless of the number of selected files.