MATLAB: Listing Filename of Axes into Listbox

guilistboxpushbutton

Good day!

I am working on a GUI which includes a list boxs, push buttons and a axes. In the axes, I've managed to load a certain image.

MY PROBLEM is that when I click the pushbutton, it should display the filename of the image displayed in the axes into the listbox and I have no clue how to start on that. Any help would be appreciated 😀

Best Answer

Jose - in your pushbutton callback you will want to access the set of strings in the list box, and append your new string (the file name) to this list. Something like the following can be done

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
data = get(handles.listbox1,'String');
if isfield(handles,'filename')
   if isempty(data)
       data = {handles.filename};
   else
       data = [data ; handles.filename];
   end
end
set(handles.listbox1,'String',data);

The above assumes that you have saved the name of the file to the handles structure in the field filename.

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MATLAB: GUI use of ListBox error:??? Attempt to reference field of non-structure array.

function upload_Callback(hObject, eventdata, handles)
    [filenamesCell, pathname] = uigetfile({'*.jpg'},'Select file(s)','MultiSelect');
    if ~isnumeric(filenamesCell)
      oldlist = cellstr( get(handles.listbox1, 'String') );
      set(handles.listbox1, 'String', [oldlist; fullfile(pathname, filenamesCell)]);
    end
function listbox1_Callback(hObject, eventdata, handles)
  choices = cellstr( get(hObject, 'String') );
  idx_chosen = get(hObject, 'Value');
  if ~isempty(idx_chosen)
    chosen_file = choices{idx_chosen);
    do something with chosen_file
  end

MATLAB: Display String Arrays in a Listbox

If you want to load a listbox with the contents of 9 string arrays, then (assuming you are using GUIDE to build your GUI) you can load the listbox in your GUI/figure's yourGuiName_OpeningFcn method (where yourGuiName is the name of your GUI)

 % load the data from the mat file
 load('s1.mat');
 load('s2.mat');
 % concatenate the string array data into a cell array
 data = [cellstr(s1) ; cellstr(s2)];
 % load the cell array into the listbox (assumed to be named listbox1
 set(handles.listbox1,'String',data);

The above example is for two string arrays only. We use the cellstr on each array to convert the array into a cell array to allow for the concatenation into a cell array since that is the format for the selections into the listbox. If any of the 9 string arrays are already cell arrays, then you can ignore this conversion.

Now in order to append new data to the listbox selections, you can do the following

 % get the cell array data that contains all the selections in the listbox
 data = get(handles.listbox1,'String');
 % append the new data 
 data = [data ; cellstr('blue')];
 % reset the selections
 set(handles.listbox1,'String',data);

Try the above and see what happens!

Best Answer

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MATLAB: GUI use of ListBox error:??? Attempt to reference field of non-structure array.

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