MATLAB GUI CODING GUIDE

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[Jan]

The question is not clear yet. What is "audio sound in a listbox"? Plase post more details.

Answer 1

[Image Analyst]

In the listbox callback you'd do something like (untested)

listboxItems = handles.listbox1.String;
selectedIndex = handles.listbox1.Value;
fileName = listboxItems{selectedIndex};
PlaySoundFile(fileName)

Here is the PlaySoundFile() function. It's a bit long because it's robust and flexible.

% Play a wav file.  Pass in the folder name, and the base file name separately.
% Or, you can pass in the string 'random' for baseWavFileName and it will pick one at random from the folder to play.
% PlaySoundFile('chime.wav'); % Tries to find it in the current folder, or on the search path.
% PlaySoundFile(handles.soundFolder, 'chime.wav');
% PlaySoundFile(handles.soundFolder, 'random');
function PlaySoundFile(varargin)
if nargin >= 2
	soundFolder = varargin{1};
	baseWavFileName = varargin{2};
else
	[soundFolder, baseFileNameNoExt, ext] = fileparts(varargin{1});
	baseWavFileName = [baseFileNameNoExt, ext];
end
try				% Read the sound file into MATLAB, and play the audio.
	% 		soundFolder = fullfile(soundFolder, 'Sound Files');
	if isempty(soundFolder) || ~isfolder(soundFolder)
		soundFolder = pwd;
	end
	fullWavFileName = fullfile(soundFolder, baseWavFileName);
	if ~isfile(fullWavFileName)
		% The sound does not exist in the folder.
		% See if it's on the search path.
		folder = fileparts(which(baseWavFileName));
		if isempty(folder)
			% Sound folder does not exist.
			warningMessage = sprintf('Warning: sound folder not found:\n%s', soundFolder);
			WarnUser(warningMessage);
			return;
		else
			% Found it somewhere on the search path.
			soundFolder = folder;
		end
	end
	if strcmpi(baseWavFileName, 'random')
		itWorked = false;
		tryCount = 1;
		while itWorked == false
			% Pick a file at random.
			filePattern = fullfile(soundFolder, '*.wav');
			waveFiles = dir(filePattern);
			numberOfFiles = length(waveFiles);
			% Get a random number
			fileToPlay = randi(numberOfFiles, 1);
			baseWavFileName = waveFiles(fileToPlay).name;
			fullWavFileName = fullfile(soundFolder, baseWavFileName);
			waveFileData = -1;
			try
				if isfile(fullWavFileName)
					[waveFileData, Fs] = audioread(fullWavFileName);
					sound(waveFileData, Fs);
					% 		soundsc(y,Fs,bits,range);
				else
					warningMessage = sprintf('Warning: sound file not found:\n%s', fullWavFileName);
					WarnUser(warningMessage);
				end
				% It worked.  It played because the audio format was OK.
				itWorked = true;
			catch
				% Increment the try count and try again to find a file that plays.
				tryCount = tryCount + 1;
				if tryCount >= numberOfFiles
					break;
				end
			end
		end % of while()
	else
		% 		baseWavFileName = 'Chime.wav';
		fullWavFileName = fullfile(soundFolder, baseWavFileName);
		waveFileData = -1;
		if isfile(fullWavFileName)
			[waveFileData, Fs] = audioread(fullWavFileName);
			sound(waveFileData, Fs);
			% 		soundsc(y,Fs,bits,range);
		else
			warningMessage = sprintf('Warning: sound file not found:\n%s', fullWavFileName);
			WarnUser(warningMessage);
		end
	end
catch ME
	if strfind(ME.message, '#85')
		% Unrecognized format.  Play chime instead.
		fprintf('Error in PlaySoundFile(): %s.\nUnrecognized sound format in file:\n\n%s\n', ME.message, fullWavFileName);
		baseWavFileName = 'Chime.wav';
		fullWavFileName = fullfile(soundFolder, baseWavFileName);
		waveFileData = -1;
		if isfile(fullWavFileName)
			[waveFileData, Fs] = audioread(fullWavFileName);
			sound(waveFileData, Fs);
			% 		soundsc(y,Fs,bits,range);
		end
	end
	errorMessage = sprintf('Error in PlaySoundFile().\nThe error reported by MATLAB is:\n\n%s', ME.message);
	fprintf('%s\n', errorMessage);
	WarnUser(errorMessage);
end
return; % from PlaySoundFile

function WarnUser(message)
fprintf('%s\n', message);
uiwait(warndlg(message));

[Image Analyst]

Uh, okay. What about it? Does it work? If not, attach your .fig file and .m file.

[Image Analyst]

Your tag said you're using GUIDE. So attach both the GUIDE fig file, and it's associated .m file.