MATLAB: Modify GUI textbox from another script file

guiguide

Hello,

I am trying to update the text of a textbox via another function that performs an operation/does something. So under my GUI Opening function I have the following.

function Example_OpeningFcn(hObject, eventdata, handles, varargin)
handles = guidata(hObject);  % Care for the newest version explicitly!
Test(hObject, handles);
handles = guidata(hObject);  % Get the version updated in myFunction!
% Update handles structure
guidata(hObject, handles);

And then my function Test is something like this.

function Test(source, args, handles, hObject, eventdata)
%text = get(handles.Textbox1, 'string');
text = ['It Worked']; 
%set(handles.Textbox1, 'string', text);
handles.Textbox1 = text
guidata(hObject, handles);
h = msgbox('Completed');
end

I am having trouble initializing text properly from what is in the textbox already and then needing to add a line, something like 'It Worked,' and then display it in the textbox.

I have been referencing this article but have gotten stuck. https://www.mathworks.com/matlabcentral/answers/66386-how-to-modify-the-handles-structure-gui-from-an-external-function Any assistance is appreciated!!

My current error is Not enough input arguments.

Error in Test (line 6) guidata(hObject, handles);

Best Answer

You call the function Test() by:

Test(hObject, handles);

but the definition of the function uses 5 input arguments:

function Test(source, args, handles, hObject, eventdata)

Then e.g. "handles" is not defined inside the function. The solution is to provide all required inputs in the calling.

Related Solutions

MATLAB: Error using handle.handle/set Invalid or deleted object.

In your callback for edit1 you replace the handle with the value extracted from the handle. That is confusing at the very least.

MATLAB: Trouble with function called from a GUI callback fonction

Claude - look closely at the order in which handles is updated. The

 function CallbackFunction(hObject, eventdata, handles)

is called passing in the latest (at the time) version of handles. This parameter (along with the other two) are passed in to your function

 function myFunction(hObject, eventdata, handles)

where the code updates the handles object and then saves it using

 guidata(hObject, handles);

But then we return back to your CallbackFunction and maybe do something, and then calls

 guidata(hObject, handles);

But which version of handles is this? This is the copy that was passed into this function when CallbackFunction was called. It is not the updated version from your call to myFunction since myFunction does not return the updated handles structure, and your code probably doesn't refresh handles (after this call to myFunction) with

 handles = guidata(hObject);

So you can do at least two different things - return the updated handles structure from myFunction by changing its signature to

 function [handles] = myFunction(hObject, eventdata, handles);

and so your code would become something like

 function CallbackFunction(hObject, eventdata, handles) 
 ...
 handles = myFunction(hObject, eventdata, handles);
 ...
 guidata(hObject, handles);   % in case you've updated handles again

 end % function

Or you can refresh your local copy as

 function CallbackFunction(hObject, eventdata, handles) 
 ...
 myFunction(hObject, eventdata, handles);
 handles = guidata(hObject);
 ...
 guidata(hObject, handles);   % in case you've updated handles again
 end % function

Hopefully, one of the above solutions will work for you!

Related Question