How to pass audio file name to GUI and have GUI play that file?

I'd like to pass a filename from a .m file to the GUI, and then have the GUI play that audio file. I'd rather send the audio filename over rather than code anything into the GUI because: 1) The GUI will play 21 iterations of different files that are predetermined 2) that predetermined iteration is random at each startup and needs to be saved outside of the GUI.

Eventually, the GUI will ask users to compare two different audio files, but right now I can't get it to even play one (which is where I need your help).

Here's (part of) the main script:

cueOrder = nchoosek([0.0, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5],2);
randomOrder = randperm(size(cueOrder,1));
cueOrder = cueOrder(randomOrder,:); %randomly organizes rows together
i = 1;
  while i==1   %i<=21 (temporary until gui runs properly)

        %name reverberation time
        reverbTime1 = num2str(cueOrder(i,1));

        % zero pad if necessary to get the proper name
        if length(reverbTime1)==1
            reverbTime1 = [reverbTime1,'.0'];
        end

        stimulusFile1 = ['\\*****\***Lab\Andrew\Music Stim Example\Stimuli\Beet_',reverbTime1,'.wav'];

        %this is supposed to be used to send file location information to the GUI but it won't work for some reason
        filestrings.stimulusFile1=stimulusFile1;
        handles=cuepreference(filestrings);
     i=i+1;
  end

Here's the GUI script. I'm less sure what's going on here... so I included a lot more of the code:

function varargout = cuepreference(varargin)

% Last Modified by GUIDE v2.5 17-Jul-2018 13:29:37

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @cuepreference_OpeningFcn, ...
                   'gui_OutputFcn',  @cuepreference_OutputFcn, ...
                   'gui_LayoutFcn',  [], ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
   gui_State.gui_Callback = str2func(varargin{1});
end

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

    if nargin == 0; %waiting here for start press

  fig = openfig(mfilename,'reuse');

      % Generate a structure of handles to pass to callbacks, and store it. 
      handles = guihandles(fig);
      guidata(fig, handles);

      % Wait for start button callback
      uiwait(fig)

      handles = guidata(fig);
      varargout{1} = handles;

% we got here by pushing the start button
elseif strcmp(varargin{1},'StartButton_Callback')==1

      fig = openfig(mfilename,'reuse'); 
      handles = guidata(fig);
      guidata(fig, handles);

        %pull in parameters from main script - this isn't working
        stimulusFile1 = varargin{1}.stimulusFile1;
        [stimulus1,fs1] = audioread(stimulusFile1);

elseif strcmp(varargin{1},'QuitButton_Callback')==1
    fig = openfig(mfilename,'reuse'); 
    handles = guidata(fig);
    guidata(fig, handles);

      close all

end

% --- Executes just before cuepreference is made visible.
function cuepreference_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   unrecognized PropertyName/PropertyValue pairs from the
%            command line (see VARARGIN)

% Choose default command line output for cuepreference
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes cuepreference wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = cuepreference_OutputFcn(hObject, eventdata, handles)
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% --- Executes on button press in PlayButton1.
function PlayButton1_Callback(hObject, eventdata, handles)
% hObject    handle to PlayButton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
sound(stimulus1,fs1);
disp('play1')
guidata(hObject, handles);
uiresume(handles.figure1);

These are the errors I get. My script is called test.m and I have it tell me when buttons are pressed in the cuepreference.m figure (start, play1, quit).

>> test
start
Attempt to reference field of non-structure array.

Error in cuepreference (line 82)
    stimulusFile1 = varargin{1}.stimulusFile1;

Error in @(hObject,eventdata)cuepreference('StartButton_Callback',hObject,eventdata,guidata(hObject))

Error using waitfor
Error while evaluating UIControl Callback

play1
Undefined function or variable 'stimulus1'.

Error in cuepreference>PlayButton1_Callback (line 185)
sound(stimulus1,fs1);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in cuepreference (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)cuepreference('PlayButton1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback

quit
>>

I'm very new to MATLAB and a lot of this was cobbled together from other projects in our lab, put together with my limited understanding of programming. I'm happy to include more of either the script or the figure code if anybody would like.

I'm guessing I'm missing something fundamental here and I can't see it!

Answer 1

[Image Analyst]

Did you try sound() or soundsc() to play your data?

[aburl]

I did - it will play when it's in the main script (or in a loop somewhere within the gui - not a part of callbacks), but I'm not sure how to do it with a button press.

Ideally, the first two comparisons can be played over and over until the user chooses their preferred version of the two... and that information is then transferred back to the main script and stored. Then, the main program sends new information to the gui about the second two songs to be compared, user chooses their preference, etc. Rinse and repeat until all comparisons are complete. I approached it this way (rather than coding the whole loop etc. in the gui itself) so the file locations, files to be compared, and storage process is all done outside of the gui and all the gui does is play the referred files.

I tried adding sound(stimulus1,fs1); under the function PlayButton1_Callback, but it isn't cooperating. I might be approaching the whole idea incorrectly in terms of structure, unfortunately.

Thanks for your suggestions!

[Image Analyst]

I'll probably have time this weekend if you want me to fix up your GUI. Just attach the .fig file and the .m file.

[aburl]

Wow! That is such a fantastic offer. Please, don't feel obligated by any means - this is going way out of your way to do me a favor!

[aburl]

Hi there - I was wondering if you had gotten a chance to take a look at this or not (or if it's just too messy to work with).

Obviously no pressure or obligation! Just curious as I'm still stuck (I'm missing something fundamental obviously).