Automatically upload a folder of files into a listBox

Hallo! I'd like to allow the GUI user to automatically select all .jpg file from a folder. I have been implemented a checkbox called check_Folder, if it is checked I'd like to upload into the listbox1 all the jpeg files that are into the folder in which is the one selected.

in the else case it works perfectlly

I've been implemented this if routine

-

 [filenamesCell, pathname] = uigetfile({'*.jpg'},'Select file(s)','MultiSelect');
 if get(handles.check_Folder , 'Value') == true
lista = dir ('pathname*.jpg');
  for i = 1: length(lista)
   oldlist = cellstr( get(handles.listbox1, 'String') );
   filenamesCell = lista(i,1).name
   set(handles.listbox1, 'String', [oldlist; fullfile(pathname, filenamesCell)]);
  end
 else 
 if ~isnumeric(filenamesCell)
      oldlist = cellstr( get(handles.listbox1, 'String') );
      set(handles.listbox1, 'String', [oldlist; fullfile(pathname, filenamesCell)]);
 end
 end

I've check into the command window that

lista = dir ('pathname*.jpg');

and

filenamesCell = lista(i,1).name;

works, but into the GUI nothing happends. And at the end I'd like to give in input (Through an execute Push_button) the list generated into the ListBox to a main fuction to elaborate the images all toghether.

Thanks 2000 times for your help

Answer 1

[Image Analyst]

In the click callback event for your listbox, have this:

% Get a list of indexes in the listbox that the user has selected.
Selected = get(handles.listbox1, 'value');
  
% If more than one is selected, bail out.  OPTIONAL.  DELETE IF YOU WANT TO ALLOW MULTIPLE SELECTIONS.
if length(Selected) > 1 
  return;
end

% If you get to here, exactly 1 is selected.
% Get a list of all the items in the listbox.
ListOfImageNames = get(handles.listbox1, 'string');
% Get the name(s) of the particular file(s) that has (have) been selected.
imageName = strcat(cell2mat(ListOfImageNames(Selected)));

[Image Analyst]

Actually you can call that code anywhere, like in the callback of a "Go!" button that will batch process the images.

Perhaps you'd like to look at MAGIC GUI: http://www.mathworks.com/matlabcentral/fileexchange/24224

Answer 2

[Adam]

get(handles.check_Folder , 'Value') == true

will not work as you want. A checkbox value is a double so you would need to do:

logical( get(handles.check_Folder , 'Value') ) == true

to get into your if statement with the correct condition.

if get(handles.check_Folder , 'Value')
   ...
end

should work too based on implicit conversion of the double to a logical.

This is an annoying effect of all ui components being the same uicontrol class rather than specific ones, so you end up with text controls having a SliderStep too!

[Walter Roberson]

Not correct: you can compare double and logical without difficulty. When you mix double and logical, the logical is converted to 0 (false) or 1 (true)

[Adam]

Ah yes, that is true actually for 0 and 1. I just happened to test with '3' as my double instead of '1' and unlike in usual logical conditions where 3 is interpreted as 'true'

3 == true

does not return true. Since a checkbox should always be 1 or 0 though the logic does work I guess.

[Emanuele Gandola]

Thank a lot but of course the if cycle work the same, maybe the problem is in this record

lista = dir ('pathname*.jpg');

if I use the entire directory it works

 lista = dir ( 'C:\Users\Emanuele\Documents\Dottorato\Sviluppo interfaccia\Caprarola 9-01-2015\*.jpg');