Error Using GUI after first time - "Error using handle.handle/set Invalid or deleted object."
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I'm a beginner in guide and I'm doing something simple where I load (pushbutton) data and when I'm finished the first time it saves the number of files I loaded. Without closing the GUI I try to load again but I get this error message:
Error using handle.handle/set Invalid or deleted object.
Error in wrg_calc_01>loadbut_Callback (line 92) set(handles.nfiles,'String', str1)
Error in gui_mainfcn (line 96) feval(varargin{:});
Error in wrg_calc_01 (line 43) gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)wrg_calc_01('loadbut_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
------------\\-------------
The code where that this is referring to is the following:
% --- Executes on button press in loadbut.
function loadbut_Callback(hObject, eventdata, handles)
% hObject handle to loadbut (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%Select the files
[filesnames, pathname] = uigetfile({'*.wrg'},'Pick a file', 'MultiSelect', 'on');
if ischar(filesnames)==0
nfiles=length(filesnames);
str=char('Number of files selected: %d');
str1=sprintf(str,nfiles);
%sets the name presented in GUI as the path
set(handles.staload, 'String', pathname)
*set(handles.nfiles,'String', str1) %String that changes* whenever i change the number of files loaded
for i=length(filesnames):-1:1
data=fullfile(pathname, filesnames(i)); %complete path, cell type
data=char(data); %Change to char type
WRGMatrix(:,:,i)=WRGreader(data); %Function to read the files and save them in a 3D Matrix
end
handles.WRGMatrix=WRGMatrix;
handles.nfiles=nfiles;
guidata(hObject, handles);
elseif ischar(filesnames)==1
warndlg('Select atleast 2 files to compute')
end
-----------------------\\--------------------
采纳的回答
This line:
handles.nfiles=nfiles;
will overwrite what I assume started off as a uicontrol the first time you run the code so that the 2nd time when you reach this line:
set(handles.nfiles,'String', str1)
handles.nfiles is no longer the uicontrol, it is instead what was set after the first run - i.e. just a number.
Never override a ui component on handles with just raw data. The component will still be there on the UI, but will no longer be accessible as it should be via the handles struct.
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