GUI callback issue.

I want to check in GUI_2 if there is a stored value to update a value in GUI_1 without opening GUI_2. Is there a way to do this? Currently GUI_1 opens GUI_2 when it searches for the information.

Current Code:

 function update_values_Callback(hObject, eventdata, handles)

 dT = getappdata(deltaT, 'deltaT'):

 if isempty(dT)
     close(deltaT);
     set(handles.deltaT, 'String', '') ;
  elseif dT ~ 0
     set(handles.deltaT, 'String', dT);
end

Answer 1

[Walter Roberson]

No, if GUI_2 is not open then it does not exist to store data. When GUI_2 is not open, it is the imaginary GUI_2.

Note: there is a difference between GUI_2 being open and GUI_2 being visible. A GUI does not need to be visible to check its properties, but it does need to be open.