MATLAB: Transfering data from GUI to main file

guideMATLABmatlab guimultiple gui's

I have a GUI, call it GUI1, with two pushbuttons, the first pushbutton executes a series of calculations which are unimportant to this question, suffice to say the calculations require user input data to function. The second pushbutton in the original GUI opens a second GUI, call it GUI2, where users are prompted to input data that will be used in the calculations mentioned earlier. I need to make it so that data entered in GUI2, can be accessed for the calculations. It may be helpful to know that the file which creates the first GUI, also houses the code for the calculations, I do not call a seperate file, but have just written the calculations in, to activate on pressing of the first pushbutton. How can I make it so that the information enterred in the second GUI can be accessed in the calculations?

Best Answer

Assign a unique tag to GUI2. This can be done by opening GUI2 in GUIDE, right click on the GUI background, select 'property inspector', and then assign a unique string in the "Tag" property.
From GUI1, find the handle to GUI2 using: h = findobj(0, 'tag', 'UNIQUE_TAG'); where "UNIQUE_TAG" is the tag you assigned.
Now get the handle to all of GUI2 components by using: handlesGUI2 = guidata(h);
Now you have access to GUI2 from GUI1.

% Summary of above
% This goes in GUI1
h = findobj(0, 'tag', 'UNIQUE_TAG');
handlesGUI2 = guidata(h);

You should also write a conditional that throws an error when 'h' is empty (meaning that GUI2 could not be found) or if numel(h)>1 (meaning your tag was not unique enough or you have >1 instances of GUI2 open).

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MATLAB: Image file transfer from one GUI to another using setappdata and getappdata

Rupam - there are probably several different ways to do this, so here is one. Let's assume that you have two GUIs named Gui1 and Gui2 and that they are distinct GUIs (i.e. you are not running two instances of the same one). In the Property Inspector for Gui1, set the HandleVisibility property to on, and the Tag property to Gui1. This will allow us to search for the GUI given its (unique) tag. Do the same for Gui2 (except name the tag Gui2). Save both.

Now suppose that in Gui2 you want access to some of the data in Gui1. What you require, is the handle to the latter. In a (say) push button callback of Gui2, you can add the following code

 function pushbutton1_Callback(hObject, eventdata, handles)
 % get the handle of Gui1
 h = findobj('Tag','Gui1');
 % if exists (not empty)
 if ~isempty(h)
    % get handles and other user-defined data associated to Gui1
    g1data = guidata(h);
    % maybe you want to set the text in Gui2 with that from Gui1
    set(handles.text1,'String',get(g1data.edit1,'String'));
    % maybe you want to get some data that was saved to the Gui1 app
    x = getappdata(h,'x');
 end

The above example tests out two ways in which we can get data from the other GUI - use either guidata which gives us the handles to all widgets of Gui1 AND any user-defined data that had been saved in Gui1 to the handles object as

 function pushbutton3_Callback(hObject, eventdata, handles)
 % in some Gui1 callback, we create the following xData field in the handles

 % structure

 handles.xData = -2*pi:0.0001:2*pi;
 % now we save the data

 guidata(hObject,handles);

We then access this data as shown previously.

The other way is to use the setappdata and getappdata pairings. Using the previous callback for Gui1, we can save the app data as

 function pushbutton3_Callback(hObject, eventdata, handles)
 % in some Gui1 callback, we create the following xData field in the handles
 % structure
 handles.xData = -2*pi:0.0001:2*pi;
 % now we save the data
 guidata(hObject,handles);
 setappdata(handles.Gui1,'x',[1:53]);

and then retrieve it with getappdata.

NOTE how we use must use the handles.Gui1 to save/set the data. And that is it. Try the above and see what happens!

MATLAB: How to automatically pass variables from one GUI to another GUI

Ak - from which GUI is Initialize_GUI called? How are you calling this function? What makes you think that handles.Flip will be updated when it is handles.KFlip that is being assigned the array of ones?

Based on your above comments, you may be calling Initialize_GUI from the second GUI...and so the handles structure there will be for the second GUI and not not the first.

If you want to pass data between two GUIs, then take a look at https://www.mathworks.com/matlabcentral/answers/146215-pass-data-between-gui-s which may be helpful. From the second GUI, you would use findobj to find the other GUI and then obtain it's handles structure.

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