Save variables in gui

Question

Fiboehh 2011-5-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6965-save-variables-in-gui

评论： Jan 2018-2-13

Dear, i'm strubling with the problem to save variables in a gui. I have an edit text with nothing in and when you type a number in it, i have to use this double in another widget or another function. I wrote http://matlab.wikia.com/wiki/FAQ?cb=4562#How_can_I_share_data_between_callback_functions_in_my_GUI.3F and tried the getappdata manner. So my callback function is like:

function ls_Callback(hObject, eventdata, handles)
% hObject    handle to ls (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
ls = str2double(get(hObject,'String')) %to convert to double
ls = getappdata(handles.ls ,'ls') % so i can save it?
save(sino,'ls') % gives fualt...

and to use it in another function i tried

    sinopara = load(sino);
    ls = sinopara.ls;

But it doesnt work, please please a understandeble solution :) thx in advance

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Answer 1

Walter Roberson 2011-5-6

1
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https://ww2.mathworks.cn/matlabcentral/answers/6965-save-variables-in-gui#answer_9536

在 MATLAB Online 中打开

function ls_Callback(hObject, eventdata, handles)
% hObject    handle to ls (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
ls = str2double(get(hObject,'String')) %to convert to double
handles.ls = ls;
guidata(handles);

Then in any other callback or function that already had handles being passed to it, handles.ls would have the value. If you need the value someplace that does not have handles being passed to it, then

handles = guidata(YourFigureNumber);

and then use handles.ls

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Walter Roberson 2011-5-6

By the way: the first thing that has to be passed to save() is a file name, but in your sample code you are passing an undefined variable.

save('sino','ls')

would have gotten you further, but your getappdata() call is incorrect so you probably would have ended up saving an empty matrix.

Jan 2018-2-13

在 MATLAB Online 中打开

@Walter: Replace:

guidata(handles)

by

guidata(hObject, handles)

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Answer 2

Fiboehh 2011-5-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6965-save-variables-in-gui#answer_9560

在 MATLAB Online 中打开

I was too fast to accept the answer. I have a fault message when i try:

function ls_Callback(hObject, eventdata, handles)
% hObject    handle to ls (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
ls = str2double(get(hObject,'String')) %to convert to double
handles.ls = ls;
guidata(handles);

this is the error message:

    ??? Error using ==> guidata at 89
    H must be the handle to a figure or figure descendent.
    Error in ==> DA>ls_Callback at 444
    guidata(handles);
    Error in ==> gui_mainfcn at 96
            feval(varargin{:});
    Error in ==> DA at 42
        gui_mainfcn(gui_State, varargin{:});
    Error in ==> @(hObject,eventdata)DA('ls_Callback',hObject,eventdata,guidata(hObject))
    ??? Error while evaluating uicontrol Callback