Diplay wav files in listbox GUI

Hi, I need to make a listbox GUI that displays every wav files that I have in a folder. What I want is I just simply put the cursor in one of the wav files at the listbox and click a pushbutton to run my sound processing code. I have this function :

function wavlist_Callback(hObject, eventdata, handles)

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

function tab1button_Callback(hObject, eventdata, handles)

Like this :

I've tried to put this code in my GUI code but I don't really know how to make it right :

allfiles = dir; %get files
allname = {allfiles(~[allfiles.isdir]).name}

Someone please help me...

Answer 1

[Walter Roberson]

set(handles.wavlist, 'String', allname);

and inside wavelist_Callback

   wavnames = get(hObject, 'String');
   choice = get(hObject, 'Value');
   selected_file = wavnames{choice};

[arina octave]

Thank you so much Walter! Now I have this problem, say that my signal processing code is just to read the wave file, so I need to write the code below inside tab1button_Callback :

[y, Fs, nbits, opts] = wavread(selected_file);

Since I got error Undefined function or variable 'selected_file', I moved the code inside wavelist_Callback to tab1button_Callback, so it becomes like this :

function tab1button_Callback(hObject, eventdata, handles)
wavnames = get(hObject, 'String');
choice = get(hObject, 'Value');
selected_file = wavnames(choice);
[y, Fs, nbits, opts] = wavread(selected_file);

But when I chose a wave file that displayed in the listbox, I got another error Invalid Wave File. Reason: Cannot open file. Do you have any idea about this? I am so sorry to ask you such question.

[Walter Roberson]

Notice that I used wavnames{choice} not wavnames(choice)

[arina octave]

But it says Cell contents reference from a non-cell array object. if I use {} not ()

[Walter Roberson]

wavlist_Callback not whatever that tablist is

[arina octave]

Oh my bad. I actually want to process an audio file that I choose in the listbox by clicking the pushbutton. But when I did this :

function wavlist_Callback(hObject, eventdata, handles)
wavnames = get(hObject, 'String');
choice = get(hObject, 'Value');
selected_file = wavnames{choice};
[y, Fs, nbits, opts] = wavread(selected_file);

The program already run when I choose the file in the listbox before I even click the pushbutton. I guess I need to define selected_file as a global variable so it can be used inside the pushbutton function. But I just don't know how to do this. I tried this :

function wavlist_Callback(hObject, eventdata, handles)
wavnames = get(hObject, 'String');
choice = get(hObject, 'Value');
handles.selected_file = wavnames{choice};

function pushbutton_Callback(hObject, eventdata, handles)
[y, Fs, nbits, opts] = wavread(handles.selected_file);

I got error Reference to non-existent field 'selected_file'. Can you help me Walter? Thank you so much.

[Walter Roberson]

After

handles.selected_file = wavnames{choice};

add

guidata(hObject, handles);

[arina octave]

It still say Reference to non-existent field 'selected_file'. Error in main>pushbutton_Callback (line 318) [y, Fs, nbits, opts] = wavread(handles.selected_file);

[Walter Roberson]

Make sure you do not press the pushbutton before you have used the listbox to select an item. Or, alternately, make sure that you define handles.selected_file even before the listbox callback has ever been run.

[arina octave]

argh my bad, thank you so much Walter. you've been a great help!