MATLAB Answers

Usama Javed

how to insert elements in listbox?

Asked by Usama Javed
on 26 Jan 2012
Latest activity Commented on by saturday
on 15 May 2015 at 10:51

how can i insert list of images into listbox?? I have a folder containg images and i want to insert list of images into the listbox

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4 Answers

Answer by Chandra Kurniawan
on 27 Jan 2012
 Accepted answer

Hi, Usama.

Maybe you are seeking for something like this?

In the openingfcn

function untitled_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
files = dir(fullfile(pwd,'Folder01','*.png'));
for x = 1 : length(files)
    handles.images{x} = imread(fullfile(pwd,'Folder01',files(x).name));
end
set(handles.listbox1,'string',{files.name});
guidata(hObject, handles);

In the listbox1 callback

function listbox1_Callback(hObject, eventdata, handles)
handles.output = hObject;
index = get(handles.listbox1,'value');
imshow(handles.images{index});
guidata(hObject, handles);

You can also change the image extention by replacing png with another extention

Eq: files = dir(fullfile(pwd,'Folder01','*.jpg'));

And if it is DICOM files

files = dir(fullfile(pwd,'Folder01','*.dcm'));
for x = 1 : length(files)
    handles.images{x} = dicomread(fullfile(pwd,'Folder01',files(x).name));
end

I hope this helps.

  8 Comments

saturday
on 15 May 2015 at 10:39

hi @chandra, i've used the code provided above..but im getting this error: 'Cell contents assignment to a non-cell array object'. Can you tell me what went wrong? All I get is a blank listbox.

Image Analyst
on 15 May 2015 at 10:45

Try

for k = 1 : length(files)
  listboxItems{k} = files(k).name;
end
set(handles.listbox1, 'String', listboxItems);
saturday
on 15 May 2015 at 10:51

@image analyst, i've tried your code..this code seem to display all my file names now..but the image is not appearing on my handles.images when I click on it..


Answer by Chandra Kurniawan
on 27 Jan 2012

In openingfcn

function untitled_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.cdir = pwd;
set(handles.listbox1,'enable','off');
guidata(hObject, handles);

In pushbutton callback

function pushbutton1_Callback(hObject, eventdata, handles)
handles.output = hObject;
fn = uigetdir(handles.cdir,'Select directory');   
if fn ~= 0   
    handles.cdir = fn;    
    img = dir(fullfile(handles.cdir,'*.png'));
    for x = 1 : length(img)
        handles.I{x} = imread(fullfile(handles.cdir,img(x).name));
    end   
    if length(img) ~= 0, set(handles.listbox1,'enable','on');
    else,                             set(handles.listbox1,'enable','off'); 
    end
    set(handles.edit1,'string',handles.cdir);
    set(handles.listbox1,'string',{img.name});    
end
guidata(hObject, handles);

In listbox callback

function listbox1_Callback(hObject, eventdata, handles)
handles.output = hObject;
index = get(handles.listbox1,'value');
imshow(handles.I{index});
guidata(hObject, handles);

  7 Comments

Elysi Cochin on 24 Oct 2012

sir i wanted one more listbox in my GUI... the same code when written... listbox1's image1 is showing listbox2's image... but listbox2's images are being displayed correctly... can u rectify my error.... same way i wanted to swap the contents of 2 listboxes.... and also i wanted same contents of listbox1 in listbox2.... please do reply me.....

Walter Roberson
on 24 Oct 2012

Please start a new Question for this, and show your code in that new Question.

Elysi Cochin on 31 Jan 2013

hi, chandra, one doubt, in addition to the listbox and axes.... i have two buttons also.... one named "DELETE" and the other named "RESTORE".....

in the DELETE button when i select a particular item from listbox that name gets deleted from the listbox and the corresponding image gets deleted from the folder....

on click of the RESTORE button all the delete images should get displayed in a figure file and added back to the folder.....

please can u help me do this option.....

i tried, its working when only one image is deleted..... if i delete more than one item, only the last deleted item is getting restored..... can u help me sort it out.....


Answer by Image Analyst
on 27 Jan 2012

I don't know how to put images into listboxes. You can put the name of the image files into the listboxes (like Titus showed you) but you can't put the images themselves in with MATLAB only. However, you can put an ActiveX control onto your GUI, and there are third party ActiveX controls that can have images in a listbox, such as ( http://www.atalasoft.com/products/dotimage/winforms). Or you can use Microsoft's "ListView" control: http://msdn.microsoft.com/en-us/library/ie/bb398790.aspx. Scroll down the page about half way until you see the listbox with pictures of bicycles in it.

  0 Comments


Answer by Titus Edelhofer
on 26 Jan 2012

Hi Usama,

something like the following:

files = dir(fullfile(theFolder, '*.jpg'));
set(handles.listbox1, 'string', {files.name})

Titus

  0 Comments


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