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nested function / Pass Data between 2 functions

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Max Müller
Max Müller on 12 Aug 2014
Answered: Max Müller on 19 Aug 2014
So this is my exampple Code. Now, i want to know: how can i pass the variable "Number" from the 1st function into the 2nd one. (hope pass is the right word)
function Example_Callback(hObject, eventdata, handles)
Number = get(handles.edit1,'String')
Data = findobj('type','axes')
set(Data,'buttondownfcn',@ClickToDrag)
function ClickToDrag (gcbo,evendata,handles)
disp('Number')

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Accepted Answer

Max Müller
Max Müller on 19 Aug 2014
1 Comment Adam on 13 Aug 2014 at 12:07
>>> I always forget exactly what are the fixed arguments you have to have for a callback function, but I'm pretty sure your Click function shouldn't take 'handles' as an argument. If it takes an argument representing 'A' (which may well end up in handles the way you have it) then that should be simply usable in your callback.
e.g.
function Click( gcbo, eventdata, A )

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More Answers (4)

Adam
Adam on 12 Aug 2014
set(Data,'buttondownfcn',{@ClickToDrag,Number})
should do the job.
Incidentally, is 'handles' appearing in your ClickToDrag function because you aren't passing it to the function. I would also never advise passing handles to a callback function. Instead pass the handle of your main figure and get the handles from that within your callback. That will give you the handles structure at the time of the callback. If you pass handles to a callback you will get the version of handles at the time it was passed.

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Joakim Magnusson
Joakim Magnusson on 12 Aug 2014
You could store it in handles like this in the first function:
handles.number = Number;
Then you could use it in your second function like this:
disp(handles.number);

Max Müller
Max Müller on 13 Aug 2014
I am forced to use v2006a
I have a solution using getappdata|setappdata.
function pushbutton2_Callback(hObject, eventdata, handles)
A = 5
Data = findobj('type','axes');
set(Data(1),'buttondownfcn',{@Click,A});
setappdata(Data(1), 'my_A', A);
function Click (gcbo,evendata,handles)
disp('Click')
Data = findobj('type','axes');
A = getappdata(gcbo, 'my_A');
disp(['A = ' A])

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Adam
Adam on 13 Aug 2014
I always forget exactly what are the fixed arguments you have to have for a callback function, but I'm pretty sure your Click function shouldn't take 'handles' as an argument. If it takes an argument representing 'A' (which may well end up in handles the way you have it) then that should be simply usable in your callback.
e.g.
function Click( gcbo, eventdata, A )

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Max Müller
Max Müller on 14 Aug 2014
Sorry for being such an idiot. My Job isnt easy .... Today i try to work on my knowledge about handles. But guys, is there anyway my CallbackFunction can return Data to my parentFunction ? my Supervisor said no. What do u say ?

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Adam
Adam on 14 Aug 2014
A callback does not have a parent function, but you can attach data in your callback to the handles structure that can be accessed from any other callback.
handles = guidata( gcbo );
handles.myData = someData;
guidata( gcbo, handles );
if you have gcbo or the main figure handle in a standard callback that comes from a pushbutton or similar. I tend to pass the main figure handle to my created callbacks so I can access the handles structure from that.
Make sure not to forget that last line though. I still forget it from time to time after 8 years using it and if you don't then your handles will not get updated to the gui.
Max Müller
Max Müller on 14 Aug 2014
thanks a lot. I am trying to learn more about matlab handles right now. Hope can become a better matlab programmer.

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