GUI

How do you transfer information in a GUI? For example, If the user types in (-4) in a text box i want to use a text/edit box to say 'Please enter a positive number.' I don't know how to transfer the information from one function to another. PLEASE HELP!

Answer 1

[Paulo Silva]

The GUIs built by GUIDE use the handles structure to share the handles for all the GUI objects, for example:

handles.edit1 %this is the handle for one edit box, edit1 is the box name

get(handles.edit1,'String') %gives you what's inside the edit box 1

%This will put your message on one text box
set(handles.text1,'String','Please enter a positive number.')

41 Complete GUI Examples by Matt Fig

For your example you can edit the edit box callback and add a detection, for example:

if str2double(get(handles.edit1,'String'))<0
%Warn the user about the negative input
set(handles.edit1,'String','0') %put zero (default value) on the edit box 
end

[Brianne Behr]

Thank you!