Using save(Filename) in a Callbackfunction of a button

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Jan Majewski
Jan Majewski 2018-11-20
评论： Guillaume 2018-11-21
I am programming a GUI and i want to save data in a callback function in matfile. I was under the impression, that if i use save only the functions workspace will be saved. Does hObject include all GUI objects in the function workspace?
save_pushbutton = uicontrol('Parent', tab ,'Style','pushbutton','Callback',@save_callback,...
'String','Save',...
'FontSize',8,...
'Units', 'normalized', 'Position',[.15 .05 .1 .05]);
editfield = uicontrol('Parent', tab ,'Style','edit','Callback',@input_control,...
'String','',...
'FontSize',8, 'TooltipString', ['Input must be numerical'], ...
'Units', 'normalized', 'Position',[.15 .8 .1 .05]);
function save_callback(hObject, eventdata)
x = get(editfield,'String');
save('save.mat');
end
In this example i want to save x in the mat file. Since i have a lot of variables i tried to keep it short and not name them all individually (save(Filename,x,y...).
Edit: Apparently there is a GUI workspace and GUI/callback workspace. I only want to save the GUI/callback.
Edit: Added more code

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采纳的回答

Adam Danz
Adam Danz 2018-11-20
编辑：Adam Danz 2018-11-20
"I was under the impression, that if i use save only the functions workspace will be saved."
Yep, as confirmed by,
help save
save Save workspace variables to file.
save(FILENAME) stores all variables from the current workspace in a
MATLAB formatted binary file (MAT-file) called FILENAME
"Does hObject include all GUI objects in the function workspace?"
No. hObject, which is the handle to the GUI object that contains the save_callback() callback function.
Your save() funciton call should do what you're describing. It should save all variables in the save_callback() workspace that come prior to save(). If you're just trying to save the variable x,
save('filename.mat', 'x');
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Jan Majewski
Jan Majewski 2018-11-20
Since i use get(editfield,'string') i think i need the function to be nested.
I will try out your solution @Adam thanks a lot!
Guillaume
Guillaume 2018-11-21
Since hObject will be a handle to the caller, you can get the figure handle from it (if i|hObject| is not the figure, it will be one of its ancestors). From the figure, you can get a handle to any of its children including the edit control. So you don't have to use nesting for that.
You can also simply change your callback signature so editfield is an input and pass that as part of the callback arguments.
But, since saving whatever happens to be in the workspace is rarely a good design, what I'd suggest you do instead is make all the variables you want to save fields of a single structure and save just that structure with the -struct option to make these fields actual variables in the mat file:
function save_callback(~, ~)
varstosave.x = get(editfield, 'String');
varstosave.y = [1 2 3 4 5];
somevarnottobesaved = [6 7 8 9 10];
save('save.mat', '-struct', varstosave);
end
which gives you full control over what you're saving without having to specify the list in the call to save.

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更多回答（1 个）

Luna
Luna 2018-11-20
编辑：Luna 2018-11-20
"Does hObject include all GUI objects in the function workspace?"
According to that, if you define all of your uicontrol elements under a property of your main gui class structure, hObject includes all items.
Actually first input of your callback is an instance of your main gui class object.
If you store uicontrol elements in a class property you can reach them everywhere.
For ex:
classdef myClass < handle
properties
guiHandles
someVariables
end
methods
% Constructor method
function myclass(obj)
obj.someVariables = {'bla bla'};
end
function createGUI(obj)
obj.guiHandles.mainFig = figure; %% creates a figure
obj.guiHandles.pushbutton = uicontrol(... %% creates a pushbutton inside that figure
'Parent',obj.guiHandles.mainFig,...
'Callback', @obj.pushbtnCallback,...
'String','OK',...
'units','normalized',...
'Position', [0.5 0.5 0.3 0.3]...
);
end
function pushbtnCallback(varargin) % Callback of the push button
% you can see each gui item which are stored in the guiHandles
% property of the class object. You can create any uicontrol
% element
myclassObjHandle = varargin{1}; % hObject -> main GUI object
pushbuttonObjHandle = varargin{2}; % source -> source object of this callback
eventData = varargin{3}; % eventData -> event data of the pushing button action
% you can save myclassObjHandle in here or you can choose to save it in command window or your script where you have called createGUI function.
end
end
end
To create myClass obj and its GUI call like below in your command window or in another script or function:
obj = myClass
obj.createGUI
% Do not forget to put debug point to pushbtnCallback function 1st line and then you will see what's inside the myclassObjHandle.guiHandles structure
% if you save obj in here it includes all gui items. It is the same object with myclassObjHandle.

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