MATLAB: How to resolve the ‘dot indexing not supported for this type of variable’ error

indexing

I am writing a code where I hit a pushbutton, it shows me a error saying "Dot indexing is not supported for variables of this type". And this error is for the line 268– set(handles.edit6,'string',fullname); fullname is basically the filepath and filename combined together.

Any kind of help will be appreciated. Thank you.

Best Answer

You used GUIDE to construct these GUIs.

When you use GUIDE, then the "handles" structure that is passed into your function always refers to information stored against the figure that the graphic element is in. "handles" is not a global structure, it is a per-GUI structure, and you have constructed three separate GUI.

You need to change

set(handles.edit6,'string',fullname);

edit6 = findobj(0, 'tag', 'edit6');
set(edit6, 'string', fullname);

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MATLAB: Attempt to reference field of non-structure array

Each handles structure is associated with a particular figure. When you are using GUIDE, the handles structure that would be automatically referenced on your behalf would belong to the figure (GUI) that the graphics object is part of. That handles structure is not going to know anything about the handles structure of the other figure (GUI) unless you specifically passed in that information.

When the first GUI calls upon the second GUI, the figure handle of the second GUI will be returned to the caller in the first GUI. The first GUI can then use guidata() on the second figure's figure handle in order to get the second GUI's handles, and the first GUI can then write the first GUI's figure handle into the second GUI's handles. Then in the second GUI, when something is needed out of the first GUI, that recorded figure handle can be used to retrieve the first GUI's handles. For example,

%in first gui
fig1 = gcf();          %first GUI's figure handle
fig2 = SecondGUI();    %returns second GUI's figure handle
handles2 = guidata(fig2);   %fetch second GUI's handles
handles2.fig1 = fig1;       %record first GUI's figure handle
guidata(fig2, handles2);    %and update second GUI's handles

and in second GUI

function some_callback(hObject, event, handles)
  %in second GUI, handles refers to handles for second GUI
  %and we stored a copy of the first GUI's figure handle there
  fig1 = handles.fig1;
  handles1 = guidata(fig1);     %retrieve handles for first GUI
  get(handles1.T, 'String')     %reference to something in first GUI

Alternately, in the case where there is only one object with the tag T, you can skip all of this and instead use

   function some_callback(hObject, event, handles)
     T = findall(0, 'Tag', 'T');    %come out come out where-ever you are!
     get(T, 'String')

findall can search all objects in all figures. It is not as efficient as the code from above, and you have complications if there are multiple objects with the same Tag.

MATLAB: I have made a gui which opens another gui & after inserting values in the edit text of 2nd gui when i press the push button to run a program it shows errors like’

If you attempt to open a second GUI by using openfig(), then the initialization code associated with the second GUI is not run, so it will not have a proper "handles" structure. To open a second GUI you should start its .m file.

Best Answer

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MATLAB: Attempt to reference field of non-structure array

MATLAB: I have made a gui which opens another gui & after inserting values in the edit text of 2nd gui when i press the push button to run a program it shows errors like’

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