MATLAB GUI CODING GUIDE

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Uwaiz Dhuny
Uwaiz Dhuny 2021-3-25
编辑： Uwaiz Dhuny 2021-3-26
...
  1 个评论
Jan
Jan 2021-3-25
The question is not clear yet. What is "audio sound in a listbox"? Plase post more details.

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回答（1 个）

Image Analyst
Image Analyst 2021-3-25
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));
  2 个评论
Image Analyst
Image Analyst 2021-3-25
Uh, okay. What about it? Does it work? If not, attach your .fig file and .m file.
Image Analyst
Image Analyst 2021-3-26
Your tag said you're using GUIDE. So attach both the GUIDE fig file, and it's associated .m file.

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