How to load .mat into GUI

Question

Edward P 2011-11-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/20640-how-to-load-mat-into-gui

Hi everyone, It occurs an error that i can't understand why.

%load button
   function pushbutton3_Callback(hObject, eventdata, handles)
  % hObject    handle to pushbutton3 (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
[filename,pathname] = uigetfile({'*.mat';'*.*'}, 'Load');
file_load = fullfile(pathname,filename);
set(handles.pushbutton1,'enable','on');
load(file_load);
imshow(handles.E,'Parent',handles.axes3);
imshow(handles.D,'Parent',handles.axes4);
guidata(hObject, handles);

the error is:

??? Error using ==> imshow>validateParent at 307
HAX must be a valid axes handle.
Error in ==> imshow at 221
      validateParent(specific_args.Parent)
Error in ==> tent>pushbutton3_Callback at 102
imshow(handles.E,'Parent',handles.axes3);
Error in ==> gui_mainfcn at 96
        feval(varargin{:});
Error in ==> tent at 43
    gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)tent('pushbutton3_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback

What i have made wrong? I believe that my workspace is successfully loaded.

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Answer 1

Titus Edelhofer 2011-11-9

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Hi Edward,

hmm, you load the handles? That will probably fail because each time you start your GUI, handles.axes3 and handles.axes4 will be different. I would do the following instead

im = load(file_load);
handles.D = im.handles.D;
handles.E = im.handles.E;
imshow(handles.E,'Parent',handles.axes3);
imshow(handles.D,'Parent',handles.axes4);

This way you leave your (other) handles untouched ...

Titus

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Edward P 2011-11-9

You were right! thanks! It really works now!

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Answer 2

Titus Edelhofer 2011-11-8

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Hi,

hmm, I am wondering why it is

imshow(handles.E,'Parent',handles.axes3);

in the error message but

imshow(handles.image1,'Parent',handles.axes3);

in the code. But apart from that: what variable do you read from the .mat file? And where do you use it? I can't see it in the code ...

Titus

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Edward P 2011-11-8

My fault! i used image1 to make easier to understand.

The point is:load some images (E and D) that i've once invoked to my program, and plot those images on axes3 and axes4. This plot is correct because i've have already used this code.

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