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Warning when passing arguments to a GUIDE GUI

user2268
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user2268 Published in May 24, 2018, 3:53 pm

I am trying to pass arguments to a GUIDE generated GUI. This works but throws a Warning.

inputTest('Passed In String')

Warning: The input to STR2FUNC "Passed In String" is not a valid function name. This will generate an error in a future release.

I know I have passed arguments to GUIDE GUIs in the past and I don't recall ever seeing this warning message before. However, I am relatively new to Matlab 2016b so something may have changed that I am not aware of. I didn't find anything in the documentation.

The warning occurs in the "initialization code - DO NOT EDIT" auto generated section and only happens when passing in an optional argument.

Is this a bug in 2016b or have I missed something?

Minimal Example below. It is a simple GUI with only a single Edit box.

function varargout = inputTest(varargin)
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @inputTest_OpeningFcn, ...
                   'gui_OutputFcn',  @inputTest_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1}); % WARNING OCCURS HERE
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

function inputTest_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
% Fill the box if the string is passed in.
if nargin == 4
    handles.edit1.String = varargin{1};
else
    handles.edit1.String = 'Nothing Passed In';
end   
guidata(hObject, handles);

function varargout = inputTest_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;

function edit1_Callback(hObject, eventdata, handles)
function edit1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
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