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

Question

Emanuele Gandola 2015-10-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/247031-gui-use-of-listbox-error-attempt-to-reference-field-of-non-structure-array

评论： Emanuele Gandola 2015-10-6

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hallo!

I used GUIDE to build a simple GUI in Matlab.

I'd like to upload multiple images with this function linked to a push button

-

% --- Executes on button press in upload.
function upload_Callback(hObject, eventdata, handles)
[filename, foldername] = uigetfile({'*.*'}, 'Select file');
[handles.filename, handles.pathname] = uigetfile({'*.jpg'},'Select file','MultiSelect');
if 
handles.filename ~= 0
handles.FileName = fullfile(handles.pathname, handles.filename);
end

-

and store all images in a ListBox first to execute them toghether.

The code into the list box is:

-

% --- Executes on selection change in listbox1.
function listbox1_Callback(hObject, eventdata, handles)
prev_list = get(handles.listbox1,'string')
vars = get(handles.upload.filename , 'Value');% new item form upload
display(vars);
new_list = [prev_list , vars ]
set(handles.listbox1,'string',new_list);

-

On the command get, when I try to create the new variable vars appear this error

-

??? Attempt to reference field of non-structure array.
Error in ==> interfaccia>listbox1_Callback at 94
vars = get(handles.upload.filename , 'Value');% new item form upload

-

What is my mistake?

Thank you in advance for your support.

Emanuele

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Answer 1

Walter Roberson 2015-10-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/247031-gui-use-of-listbox-error-attempt-to-reference-field-of-non-structure-array#answer_194876

在 MATLAB Online 中打开

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