Image browser- populate listbox and show image problems

Based on Image Analyst answer to the question in http://www.mathworks.com/matlabcentral/answers/78421

I was slightly modifying the code (marked as DIFFERENT FROM ORIGINAL) in order to populate listbox with file names in order to make a very simple image browser.

Unfortunately it does not work, neither populating the list and neither showing the file. Any reason why? and how can I fix it?

Code:

function varargout = browser(varargin)
% BROWSER MATLAB code for browser.fig
%      BROWSER, by itself, creates a new BROWSER or raises the existing
%      singleton*.
%
%      H = BROWSER returns the handle to a new BROWSER or the handle to
%      the existing singleton*.
%
%      BROWSER('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in BROWSER.M with the given input arguments.
%
%      BROWSER('Property','Value',...) creates a new BROWSER or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before browser_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to browser_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help browser

% Last Modified by GUIDE v2.5 28-Oct-2013 14:17:15

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @browser_OpeningFcn, ...
                   'gui_OutputFcn',  @browser_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before browser is made visible.
function browser_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to browser (see VARARGIN)

% Choose default command line output for browser
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes browser wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = browser_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% --- Executes on button press in ImageFolder.
function ImageFolder_Callback(hObject, eventdata, handles)
% hObject    handle to ImageFolder (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%=====================================================================
% --- Load up the listbox with image files in folder handles.ImageFolder

indir=uigetdir;
handles.ImageFolder =char(indir);

function handles = LoadImageList(handles)        
    ListOfImageNames = {};
    folder = handles.ImageFolder;
    if length(folder) > 0 
        if exist(folder,'dir') == false
            msgboxw(['Folder ' folder ' does not exist.']);
            return;
        end
%       fprintf(1, 'Getting list of images in folder: %s\n', folder);
    else
        fprintf('No folder specified as input for function LoadImageList.\n');
        WarnUser('No folder specified as input for function LoadImageList.');
        return;
    end
    % If it gets to here, the folder is good.
    ImageFiles = dir([folder '\*.*']);
    for Index = 1:length(ImageFiles)
        baseFileName = ImageFiles(Index).name;
        [folder2, name, extension] = fileparts(baseFileName);
        extension = upper(extension);
        switch lower(extension)
        case {'.png', '.bmp', '.jpg', '.tif'}
            % Allow only PNG, TIF, JPG, or BMP images              
            ListOfImageNames = [ListOfImageNames baseFileName];
        otherwise
        end
    end
    set(handles.lstImageList,'string',ListOfImageNames);
    % Need to deselect everything otherwise if new folder has fewer files than the last folder used, the listbox won't show up.
    set(handles.lstImageList,'value', []);
    return; % from LoadImageList()

% --- Executes on selection change in lstImageList.
function lstImageList_Callback(hObject, eventdata, handles)
% hObject    handle to lstImageList (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns lstImageList contents as cell array
%        contents{get(hObject,'Value')} returns selected item from lstImageList
% Get image name
Selected = get(handles.lstImageList, 'value');
% If more than one is selected, bail out.
if length(Selected) > 1
    baseImageFileName = '';
    % Change mouse pointer (cursor) to an arrow.
    set(gcf,'Pointer','arrow')
    drawnow;    % Cursor won't change right away unless you do this.
    return;
end
% If only one is selected, display it.
ListOfImageNames = get(handles.lstImageList, 'string');
% Get the name of the item in the listbox that they clicked on.
baseImageFileName = cell2mat(ListOfImageNames(Selected));
% Prepend folder.
fullImageFileName = fullfile(handles.ImageFolder, baseImageFileName);

% Display the image. DIFFERENT FROM ORIGINAL
axes(handles.imageAxes);
imshow(fullImageFileName);

% --- Executes during object creation, after setting all properties.
function lstImageList_CreateFcn(hObject, eventdata, handles)
% hObject    handle to lstImageList (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: listbox controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

Answer 1

[Image Analyst]

Right before you execute this line:

set(handles.lstImageList,'string',ListOfImageNames);

what is inside ListOfImageNames?

[Ely Raz]

This is what I copy&paste from the example you gave and therefore I can not tell you. The long code (sorry for that) is all the code. Any idea how to solve it?

[Image Analyst]

You can tell me because you will debug your program and set a breakpoint on the line and then tell me what is in the ListOfImageNames variable. Is it empty? Or does it have things in it?

If you don't know how to do that then look at this excellent video.

http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

[Ely Raz]

Tried and I get nothing, like it is frozen.

[Image Analyst]

Attach your files, and if I get time, I'll try them.

[Ely Raz]

Thanks a lot in advance. File attached.