Question

我正在创建一个包含两个uicontrol对象的MATLAB GUI：一个按钮和一个列表框。我使用按钮将文件名添加到列表框中。当我从m文件运行GUI时，它工作正常。仅当我运行.fig文件本身时才会出现此问题。这是回调代码和错误：

function add_file_Callback(hObject, eventdata, handles)
% hObject    handle to add_file (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%gets input file(s) from user

[input_file,pathname] = uigetfile( ...
       {'*.jpg;*.tif;*.png;*.gif;*.bmp;*.pgm'}, ...
        'Select files', ... 
        'MultiSelect', 'on');

%if file selection is cancelled, pathname should be zero
%and nothing should happen
if pathname == 0
    return
end

%gets the current data file names inside the listbox

inputFileNames = get(handles.img_list,'String');

%if they only select one file, then the data will not be a cell
%if more than one file selected at once,
%then the data is stored inside a cell
if iscell(input_file) == 0

    %add the most recent data file selected to the cell containing
    %all the data file names
    inputFileNames{end+1} = input_file;

%else, data will be in cell format
else
    %stores full file path into inputFileNames
    for n = 1:length(input_file)
        %notice the use of {}, because we are dealing with a cell here!
        inputFileNames{end+1} = input_file{n};
    end
end

%updates the gui to display all filenames in the listbox
set(handles.img_list,'String',inputFileNames);

%make sure first file is always selected so it doesn't go out of range
%the GUI will break if this value is out of range
set(handles.img_list,'Value',1);

% Update handles structure
guidata(hObject, handles);

错误：

Error in ==> Texture_Classification_GUI>add_file_Callback at 154
inputFileNames = get(handles.img_list,'String');

Error in ==> gui_mainfcn at 95
        feval(varargin{:});

Error in ==> Texture_Classification_GUI at 42
    gui_mainfcn(gui_State, varargin{:});

??? Error using ==> Texture_Classification_GUI('add_file_Callback',gcbo,[],guidata(gcbo))
Attempt to reference field of non-structure array.

??? Error while evaluating uicontrol Callback

非常感谢任何帮助。

Answer 1

“运行无花果文件本身”是什么意思？ GUIDE会创建两个文件：m-file和.fig文件（例如my_guide_app.m和my_guide_app.fig）。您是否使用.fig之类的内容打开openfig？这不起作用，因为m-file需要设置创建句柄结构的数字打开功能。因此，要运行使用GUIDE制作的GUI，必须调用m-file来启动应用程序而不只是打开.fig文件。

如果我误解了您关于打开.fig文件的声明，请告诉我，因为可能还有其他问题。

Answer 2

列表框需要在GUIDE中初始化。如果用1选项初始化它，它将是一个char数组，如果用多于1个选项初始化它，它将是一个单元数组。所以，你必须在那里（iscell）进行类似的检查;然后添加新选项。

MATLAB GUI使用GUIDE：列表框问题

2 个答案: