MATLAB: Slider listener using GUIDE

guidelistenerslider

I need to update the variable frame2display dynamically. But the following code isnt working. How should I modify it? I would like to stick with using GUIDE. Thanks.
function getMCavi_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
[fname,~,~]  = uigetfile('*.avi*','Select the motion stablized .avi video',pwd); 
VidObj_stbl = VideoReader(fname);
nframes_all=round((VidObj_stbl.Duration)/(1/VidObj_stbl.FrameRate));
for m=1:nframes_all
    temp=(readFrame(VidObj_stbl,'native'));
    imframes_all(:,:,m)=temp(:,:,1);
end;
imframes_all = double(imframes_all);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%confusing portion %%%%%%%%%%%%%%%%%%%%%%%%%%%
handles.slider_value = addlistener(handles.slider_frameNum,'Value', 'PostSet', ...
                                      @(hObject,eventdata)test2('slider_frameNum_Callback',hObject,eventdata,guidata(hObject)));
slider_value = handles.slider_value;
display(slider_value);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
frame2display = slider_value;
if frame2display == 0
    frame2display = 1; 
end
img = squeeze(imframes_all(:,:,frame2display));
imagesc(img, 'Parent', handles.MCimages); axis equal tight off; colormap gray    
guidata(hObject,handles)
% --- Executes on slider movement.
function slider_frameNum_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
slider_value = get(hObject,'Value');
handles.slider_value = slider_value; 
guidata(hObject,handles)

Best Answer

I would not use addlistner for that. I would use the normal Callback property of the uicontrol('style', 'slider')
You should save imframes_all somewhere, and the Callback for the slider should extract the fetch slider value, pull out the corresponding frame from imframes_all, and image() or imshow() it into the appropriate axes. You would initialize the slider value and call the Callback "manually" to get the process going.
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