如何读取.wav文件，并通过2个按钮以其他名称保存？

Question

这是我的打开和保存按钮代码：

% --- Executes on button press in Openb.
function Openb_Callback(hObject, eventdata, handles)
% hObject    handle to Openb (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global filename pathname y fs nbits;
[filename, pathname]=uigetfile('*.wav', 'Select a wave file');
[y, fs, nbits] = wavread(fullfile(pathname, filename));
guidata(hObject,handels);


% --- Executes on button press in Saveb.
function Saveb_Callback(hObject, eventdata, handles)
% hObject    handle to Saveb (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global filename pathname y fs nbits;
[pathname filename]=uiputfile('*.wave', 'Choose a name to save file');
wavwrite(handles.y,fs,nbits,fullfile(pathname,filename));
guidata(hObject,handels);

并得到这些错误：

参考不存在的字段＆＃39; y＆＃39;。

M_player中的错误＆gt; Saveb_Callback（第124行） wavwrite（handles.y，FS和nbits，完整文件（路径名，文件名））;

gui_mainfcn出错（第96行）         feval（varargin {：}）;

M_player中的错误（第42行）     gui_mainfcn（gui_State，varargin {：}）;

@（hObject，eventdata）M_player（＆＃39; Saveb_Callback＆＃39;，hObject，eventdata，guidata（hObject））中的错误

评估uicontrol回调时出错

我通过将代码编辑为以下代码来解决我的问题：

% --- Executes on button press in Openb.
function Openb_Callback(hObject, eventdata, handles)
% hObject    handle to Openb (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global filename pathname y fs nbits;
[filename, pathname]=uigetfile('*.wav', 'Select a wave file');
[y, fs, nbits] = wavread(fullfile(pathname, filename));


% --- Executes on button press in Saveb.
function Saveb_Callback(hObject, eventdata, handles)
% hObject    handle to Saveb (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global filename pathname y fs nbits;
[filename pathname]=uiputfile('*.wave', 'Choose a name to save file');
wavwrite(y , [pathname,filename]);