Output from handles instead of globals

I have these three different functions that all relate to the GUI, one doing some stuff, the other one using the result, and the third using the result from the 2nd. I have tried to use globals for the results, but it is a mess, so i was wondering if it was possible to use handles or something like that to do it instead?

function openFile_Callback(hObject, eventdata, handles)

global im;

im = imread(myimage);

-

function analyzeImage_Callback(~, ~, ~)

global im

global dat

level = graythresh(im);

diff_im = im2bw(im,level);

area = sum(diff_im);

dat = [area];

-

function exportResults_Callback(hObject, eventdata, handles)

global dat

csvwrite('csvlist.dat',dat)

Answer 1

[Bjoern]

i cant get nested functions to work,when i try to run my code after making it nested i get this error:

??? Error while evaluating uimenu Callback

??? Error using ==> feval Undefined function or method 'openFile_Callback' for input arguments of type 'struct'.

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> cellcounter at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)cellcounter('openFile_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uimenu Callback

[Matt Tearle]

From the names, am I right in assuming that the GUI layout was done in GUIDE? If so, the generated code probably used subfunctions... ergh.

OK, probably easiest to go to plan B: use get/setappdata:

setappdata(handles.figure1,'image',im);

then

im = getappdata(handles.figure1,'image');

[Bjoern]

you mean like:

function openFile_Callback(hObject, eventdata, handles)

im = imread(myimage);

setappdata(handles.figure1,'image',im);

function analyzeImage_Callback(hObject, eventdata, handles)

im = getappdata(handles.figure1,'image');

imshow(im);

Because i still get an error with that.

[Matt Tearle]

Yep, just like that. So what error do you get now?

[Bjoern]

i get the error that im is empty, "??? Undefined function or variable "im".

".

Is setappdata( the same as set(

[Walter Roberson]

No, setappdata() is *not* the same as set() ! Please read the documentation!

[Bjoern]

it got it working. Thanks for the help

Answer 2

[Matt Tearle]

If these functions all live in the same file, the simplest way to pass data around is to use nested functions. A nested function has access to its parent's workspace.

The other way is to use getappdata/setappdata to embed the data in the figure handle.