Reference to non-existent field error

2 views (last 30 days)
MHS on 18 Oct 2019
Commented: Stephen23 on 18 Oct 2019
Hello Everyone. I am getting an error related to
Reference to non-existent field 'mystructdata'.
Error in GUI_ParametersFinal>pushbutton_Save_Callback (line 120)
data = handles.mystructdata;
Error in gui_mainfcn (line 95)
Error in GUI_ParametersFinal (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)GUI_ParametersFinal('pushbutton_Save_Callback',hObject,eventdata,guidata(hObject))
When I do not type any value inside the edit text boxes, it gives me this error when saving inside the mat file. How can I remove this error and save another value only, which is needed and not related to my struct fields.
My code for pushbutton save_ callback is this:
function pushbutton_Save_Callback(hObject, eventdata, handles)
startingFolder = pwd
defaultFileName = fullfile(startingFolder, '*.mat');
[baseFileName, folder] = uiputfile(defaultFileName, 'Select mat file');
if baseFileName == 0
fullFileName = fullfile(folder, baseFileName);
if (exist('str') == 0); or if(exist('handles.mystructdata') == 0)
data.Level = handles.Level;
data = handles.mystructdata;
data.Level = handles.Level;
If I dont type anything inside the edit text boxes, I will like these text boxes to be ignored and just save that text box value in which I typed a value using structs fields. Thank you so much.
  1 Comment
Walter Roberson
Walter Roberson on 18 Oct 2019
if (exist('str') == 0); or if(exist('handles.mystructdata') == 0)
That is not correct syntax for or.
if ~exist('str', 'var') || ~isfield(handles, 'mystructdata')

Sign in to comment.

Accepted Answer

Adam on 18 Oct 2019
does not work for struct fields.
isfield( handles, 'mystructdata' )
is what you should use to check if the field exists.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!