ListBox callback error

Hi, do not know where I made a mistake? Thank you very much.

??? Undefined variable "handles" or class "handles.ListBox".
Error in ==> dilist> dilist_callback at 23 
fname = get (handles.ListBox, 'String'); 

??? Evaluating Error while uicontrol Callback

function dilist 
h1 = figure; 
handles.ListBox = uicontrol ('Units', 'Normalized', 'Position', [0.01 0.1 0.1 0.15], ... 
'Style', 'List', 'Callback', @ dilist_callback);
P = fileparts (mfilename ('fullpath')); 
nfolder uigetdir = (P, 'whatever'); 
handles.dfolder = nfolder;
dfiles = dir (handles.dfolder); 
dfiles dfiles = (3: end); 
nfiles = length (dfiles); 
nfiles if <1 
disp ('no files availabel.') 
return; 
end
set (handles.ListBox, 'String', char (dfiles.name), 'value', 1); 
s = [num2str (nfiles) 'files in:' handles.dfolder]; 
end 
dilist_callback function (src, evt) 
fname = get (handles.ListBox, 'String'); 
fname = fname (get (handles.ListBox, 'value'), :); 
dicominfo info = ([handles.dfolder '\' fname]); 
Y1 = dicomread (info); 
imshow (Y1) 
clims = [10 1800]; 
end

[Walter Roberson]

duplicate is at http://www.mathworks.com/matlabcentral/answers/28597-help-with-listbox-in-dicom

Answer 1

[Walter Roberson]

After the line

handles.ListBox = [...]

add

guidata(h1, handles);

Change the line

dilist_callback function (src, evt)

to

function dilist_callback (src, evt)

In the line immediately after that add

handles = guidata(ancestor(src),'figure');

[Adam]

Thank you but now matlab did nothing. Depicted in the figure window which empty listbox.

[Tannistha]

try this

set (handles.ListBox, 'String', {dfiles.name}, 'value', 1)