MATLAB: Select an image folder in GUI

guiuigetdir

Hi,
I have problem to select an image folder in GUI. My GUI functions like that, when I push the selectSourceButton button I select the folder. Later, when I push the startButton the program should read all the files.
It seems my problem is how to transfer the Source folder information between the functions. I hope anyone can help me.
Thank you.
function selectSourceButton_Callback(hObject, eventdata, handles)
% hObject    handle to selectSourceButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles.output = hObject; 
sourceFolder = uigetdir();
textLabel = sprintf('%s', sourceFolder);
set(handles.sourceFolderEdit, 'string', textLabel);
myFolder = get(handles.sourceFolderEdit, 'String'); 
guidata(hObject, handles);
function startButton_Callback(hObject, eventdata, handles)
handles.output = hObject;
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.jpg');
jpegFiles = dir(filePattern);
for k = 1:length(jpegFiles)
      baseFileName = jpegFiles(k).name;
      fullFileName = fullfile(myFolder, baseFileName);
      fprintf(1, 'Now reading %s\n', fullFileName);
      imageArray = imread(fullFileName);
  end

Best Answer

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F
I'd just use one folder - not myFolder and not sourceFolder. Just pick one and attach it to handles.
function selectSourceButton_Callback(hObject, eventdata, handles)
  sourceFolder = uigetdir();
  set(handles.sourceFolderEdit, 'string', sourceFolder );
  handles.sourceFolder = sourceFolder;
  guidata(hObject, handles);
function startButton_Callback(hObject, eventdata, handles)
if ~isdir(handles.sourceFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', handles.sourceFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(handles.sourceFolder, '*.jpg');
jpegFiles = dir(filePattern);
for k = 1:length(jpegFiles)
      baseFileName = jpegFiles(k).name;
      fullFileName = fullfile(handles.sourceFolder, baseFileName);
      fprintf(1, 'Now reading %s\n', fullFileName);
      imageArray = imread(fullFileName);
end
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