How can I pass variables (declare in a pop up menu) in a pushbotton section of GUI ?
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Hi, I am doing GUI which has a popup menu that allow the user to choose from several options (different type of steel), lets say I have three options each one has different values (Drho0, Ntot and Scalamobi). My coding is like this (for example):
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject handle to popupmenu1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1 contents as cell array
% contents{get(hObject,'Value')} returns selected item from popupmenu1
switch get(handles.popupmenu1,'Value')
case 304
p1 = -3.929e+12;
p2 = 9.107e+12;
p3 = -7.5e+12;
p4 = 2.771e+12;
p5 = -2.709e+11;
S.Drho0=(p1*riduzione^4+p2*riduzione^3+p3*riduzione^2+p4*riduzione+p5);
S.Ntot=1.311e-69*Drho0^(6.975);
S.Scalamobi=1e-04; %%coefficiente di riscalamento che tiene conto della presenza di leganti
case 316
S.Drho0 = (2.8e11*(e)+1.57e10);
S.Ntot = (-5.23e8*(e)^2+ 1.76e9*(e) - 1.318e8);
S.Scalamobi=1.2e-05;
otherwise
end
set(handles.popupmenu, 'UserData', S);
I tried to use an old answer from matlabcentral: https://it.mathworks.com/matlabcentral/answers/38419-get-value-from-popup-menu-and-use-it-in-different-function. But I am getting an error when I try to access my variable in the push- button callback :
S = get(handles.popupmenu1, 'UserData');
Drho0=S.Drho0;
Ntot=S.Ntot;
Scalamobi=S.Scalamobi;
I am getting this error: "Struct contents reference from a non-struct array object". What am I doing wrong ? Thanks in advance
2 commentaires
Adam
le 15 Mai 2017
Which line throws the error? You can use
dbstop if error
to force the code to stop on the error line (or use the Breakpoints menu).
Réponses (1)
Adam
le 15 Mai 2017
I didn't notice this before. Maybe it is a typo in your question, but I will assume you just pasted in from your code:
set(handles.popupmenu, 'UserData', S);
...
S = get(handles.popupmenu1, 'UserData');
You are missing the '1' off the end of handles.popupmenu. I'm surprised this line does not cause an error though as I wouldn't have though it was valid syntax if you don't also have a graphics object called handles.popupmenu.
2 commentaires
Adam
le 15 Mai 2017
I would recommend just using standard handle usage rather than attaching to the 'UserData' of a UI component - i.e.
handles.S = S;
guidata( hObject, handles );
in your popup callback, then
S = handles.S;
in your pushbutton callback, or just use it directly as handles.S if you prefer. I would name it something more meaningful personally too, but since you called it S I did the same.
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