MATLAB: How to use variables from the GUI in the function

guisavevariableworkspace

I have a GUI with text boxes and pop up menus, but I'm having trouble trying to save the output variables and then using them within my function. I call upon the GUI in my function but the code executes before I even get to choose my options from the GUI! I'm not very familiar with GUIs some explanation would be appreciated! Thank you in advance.

Best Answer

Seems like you're using GUIDE?

You have to uncomment the uiwait(handles.figure1) in the OpeningFcn. Otherwise your GUI will close out before you can do anything. You also need to use uiresume in each Callback function to ensure your uiwait coding execution blockage is lifted.

To see an example, do the following:

1) >> guide
2) In guide setup, Create New GUI -> Modal Question Dialog -> OK
3) Look at the .m file for CloseRequestFcn, OpeningFcn, CallBack, OutputFcn

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You need to put a static text label on your GUI with a tag of txtValue (or whatever you want). Then in each callback where you want to change handles.value you need to have this:

handles.value = handles.value + 80; % Or whatever value you want.
handles.txtValue.String = sprintf('The Value now = %.1f', handle.value);
% Update handles structure
guidata(hObject, handles); % Not calling this was your problem.

MATLAB: Prevent main GUI from “refreshing” when passing data to it from a subgui.

I solved this by passing in the handles structure of the main GUI that also contained the main GUI figure handle, adding it as a branch to the subgui handle structure, and then updating the main figure handle from within the subgui using guidata().

New code:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%MAIN GUI opening function %%%%
function MainGui_OpeningFcn(hObject,~,handles,varargin)
handles.main = gcf;
guidata(hObject,handles)
%%%%Some callback within MAIN GUI %%%%
function CallSubGui_Callback(hObject, ~, handles)
subgui(handles)
guidata(hObject,handles)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%SUBGUI opening function %%%%
function SubGui_OpeningFcn(hObject,~,handles,varargin)
handles.mainGuiHandles = varargin(1);
guidata(hObject,handles)
%%%%Some callback within SUB GUI %%%%
function ChangeData_Callback(hObject,~,handles,varargin)
some_data = rand(5);
handles.mainGuiHandles.some_data = some_data;
guidata(handles.mainGuiHandles.main,handles.mainGuiHandles)

Best Answer

Related Solutions

MATLAB: How to update value of a variable when a button is pushed? What am I doing wrong in this code

MATLAB: Prevent main GUI from “refreshing” when passing data to it from a subgui.

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