matlab gui list box

      function varargout = m(varargin)
  % MIDTERM2017 MATLAB code for m.fig
  %MIDTERM2017, by itself, creates a new MIDTERM2017 or raises the existing
  %      singleton*.
  %
  %      H = MIDTERM2017 returns the handle to a new MIDTERM2017 or the handle to
  %      the existing singleton*.
  %
  %      MIDTERM2017('CALLBACK',hObject,eventData,handles,...) calls the local
  %      function named CALLBACK in MIDTERM2017.M with the given input arguments.
  %
  %      MIDTERM2017('Property','Value',...) creates a new MIDTERM2017 or raises the
  %      existing singleton*.  Starting from the left, property value pairs are
  %      applied to the GUI before midterm2017_OpeningFcn gets called.  An
  %      unrecognized property name or invalid value makes property application
  %      stop.  All inputs are passed to midterm2017_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 midterm2017

% Last Modified by GUIDE v2.5 20-Apr-2017 19:17:54

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @midterm2017_OpeningFcn, ...
                   'gui_OutputFcn',  @midterm2017_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 midterm2017 is made visible.
function midterm2017_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 midterm2017 (see VARARGIN)
SelectedItem = findobj('Tag','listbox1');
t=timer('Period',10,'ExecutionMode','fixedRate');
t.TimerFcn={@listUpdateFcn, handles};
start(t)

% Choose default command line output for midterm2017
handles.output = hObject;
setappdata(handles.figure1,'Timer',t)

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes midterm2017 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = midterm2017_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;

% --------------------------------------------------------------------
function Untitled_1_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
showAbout(1,2)

% --- Executes on selection change in listbox1.
function listbox1_Callback(hObject, eventdata, handles)
% hObject    handle to listbox1 (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 listbox1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from listbox1
contents = cellstr(get(hObject,'String'));
imageFile = contents{get(hObject,'Value')};
im=imread(imageFile);
imshow(im,'Parent',handles.axes2)
set(handles.listbox1,'Value',1)
% --- Executes during object creation, after setting all properties.
function listbox1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to listbox1 (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

% --- Executes during object deletion, before destroying properties.
function figure1_DeleteFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
t = getappdata(handles.figure1,'Timer');
stop(t)
delete(t)
delete(hObject)

function listUpdateFcn(o, e, handles)
imf = imformats;
imFiles=[imf.ext];
files = dir('*.*');
names = {files.name};
imageFileIndices = contains(names,imFiles);
set(handles.listbox1,'String',names(imageFileIndices))
listLength = length(handles.String); % SelectedItem yenilendiðinde hata oluþmamasý için
 if handles.Value > listLength  
     handles.Value = listLength;
 end
%guidata(handles.figure1, handles);

% --- Executes on button press in pushbutton1.
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)
folder_name = uigetdir();
    % get what is inside the folder
    Infolder = dir(folder_name);
    imageFile = {Infolder(~[Infolder.isdir]).name};
    set(handles.listbox1,'String', imageFile);

      % --- Executes on selection change in popupmenu1.
  function popupmenu1_Callback(hObject, eventdata, handles)
  % hObject    handle to popupmenu1 (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 popupmenu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu1
  img_color =getimage(handles.axes2);
color = handles.popupmenu1.Value;

im_red = img_color;
im_green = img_color;
im_blue = img_color;
if color == 1
   imshow(img_color,'Parent',handles.axes2); % RGB renk
end
if color == 2
im_red(:,:,2) = 0; 
im_red(:,:,3) = 0; 
imshow(im_red,'Parent',handles.axes2);
end
if color == 3
im_green(:,:,1) = 0; 
im_green(:,:,3) = 0;  
imshow(im_green,'Parent',handles.axes2);

end

if color == 4
im_blue(:,:,1) = 0; 
im_blue(:,:,2) = 0;  
imshow(im_blue,'Parent',handles.axes2);
end
% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu 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]

You don't want handles.Value, you want handles.listbox1.Value.

You might want to use a fully debugged framework like MAGIC: http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component

This GUI will help the novice user get up to speed very quickly on using GUI-based applications. Everything is laid out in a very simple Step 1, Step 2, Step 3, etc. layout. It is a very good starting point for a typical image analysis application. This application uses GUIDE to do the user interface design, and has most of the basic controls such as buttons, listboxes, checkboxes, radio buttons, scrollbars, etc. It allows the user to select a folder of images, select one or more images and display them, to select a series of options, and to individually or batch process one or more images. The user can.....

[Image Analyst]

If you did the popupmenu more than once, you're displaying a color channel that you've erased in a prior calling of it. For example if you say show red and erase green and blue, and then say to show green, it will get the current image from the axes, which has green all set to zero, and then set the red and blue channels to zero and show the green, well...the green was set to zero on the prior calling so of course it shows black.

Don't do this:

img_color =getimage(handles.axes2);

because that is just retrieving an image that had channels erased. Get it some other way, like from a global variable, getappdata(), or from a field of the handles structure.

popupmenu1_Callback could look like this instead of the overly complicated version you have

color = handles.popupmenu1.Value;
ramp = (0 : 255)'
z = zeros(256, 1);
if color == 1
    imshow(img_color,'Parent',handles.axes2);
elseif color == 2
    imshow(img_color(:,:,1),'Parent',handles.axes2);
    cmap = [ramp, z, z];
elseif color == 3
    imshow(img_color(:,:,2),'Parent',handles.axes2);
    cmap = [z, ramp, z];
elseif color == 4
    imshow(img_color(:,:,3),'Parent',handles.axes2);
    cmap = [z, z, ramp];
end

Then apply the proper colormap.

colormap(cmap);

This should work for subsequent callings because you are not changing the image at all and you're not getting the color image from the axes anymore (if you did what I said).

[koklan majid]

when i apply this code this error happens " Error using horzcat Dimensions of matrices being concatenated are not consistent" and the images appear in black and white

[Image Analyst]

You must have messed up in your definition of ramp or z. They should both be 256 rows by 1 column. Perhaps you forgot the apostrophe in the ramp definition. You forgot to show your code so I don't know. Why don't you share it with me?

[koklan majid]

color = handles.popupmenu1.Value;
img_color= getappdata(0,'imm');
ramp = (0 : 255);
z = zeros(256, 1);
if color == 1

      imshow(img_color,'Parent',handles.axes2);
              cmap = [ramp, z, z];

elseif color == 2
    imshow(img_color(:,:,1),'Parent',handles.axes2);

elseif color == 3
    imshow(img_color(:,:,2),'Parent',handles.axes2);
    cmap = [z, ramp, z];
elseif color == 4
    imshow(img_color(:,:,3),'Parent',handles.axes2);
    cmap = [z, z, ramp];

end
colormap(cmap);

this is th code i am using the same as you provided it above

[Image Analyst]

It is NOT the same as I provided. You did not copy and paste my code or else you'd have the transpose operator (apostrophe) in there. It's always been there - I did not just add it after your reply. Did you see where I said "you forgot the apostrophe in the ramp definition". I guess not because you then went on to post code that didn't have it. Put the apostrophe in there like I said and showed and it should work.

[Image Analyst]

You need to have a timer where you call the function that loads your listbox every 5 seconds. Look up timer.

[Image Analyst]

I don't have anything like that coded up and ready to give it to you. So one of us would have to do that and I think it should be you. Sorry. Also look at the function addlistener(), which might help.

[Walter Roberson]

Did koklan majid delete some comments? I do not seem to have a context for some of what Image Analyst replied.

Answer 2

[Walter Roberson]

In pushbutton1_Callback you do a uigetdir(), and you dir() the folder indicated, recording only the relevant file names in the listbox.

In listUpdateFcn you look in the current directory, find the files, and update the listbox.

In listbox1_Callback, you extract the selected string from the listbox, and imread() that.

Problem: what you record in the listbox does not have the path attached to it, and you do not record the path to add it on to the names. You might have let the user choose which other directory to get file names from, but then you attempt to read those files from the current directory.

You should be saving a copy of the chosen directory name in pusbutton1_Callback, and you should be using that directory name when you imread() the file.

You should probably use fullfile() along the way.

[koklan majid]

Can you line out the wrong lines for me please ? And what about the black image from the popupmenu

[Walter Roberson]

After

      set(handles.listbox1,'String', imageFile);

do

      set(handles.listbox1,'UserData', folder_name);

Change

im=imread(imageFile);

to

im = imread( fullfile( get(hObject, 'UserData'), 'imageFile);

[koklan majid]

still having the same problem when i change the path direction the Listbox disappear