matlab - guidata 未在 MATLAB GUI 中更新

Question

我有一个 MATLAB 图形用户界面:
1) 一个由activex控制的VLC窗口。
2) 一组单选按钮，用于在特定帧上“注释”视频。

我有工作代码，但我缺少调用注释的函数的输出。此函数 Annotate 应将带注释的值替换到先前创建的表 final_data 中。我可以将替换值显示到控制台，我希望 guidata 更新 handles，所以我的主要函数的输出应该包含一个 .final_data具有更新值的字段。但是，对输出对象调用 .final_data 会返回空占位符值。

function Annotate(varargin)

    hFigure = findobj('tag', 'VideoPlay');
    handles = guidata(hFigure);

    % change value of the orther button to 0
    set(handles.hNotAnnotateButton, 'Value', 0);

    mypos = handles.vlc.input.Position; % >> proxy to calculate frame
    behavior = handles.Behavior;  % >>> Tag to be annotated

    % Calculate frame
    myframe = ceil(handles.vlc.input.Time/1000 * handles.frameRate) - 1;

    handles.final_data.behavior(myframe) = behavior;

    display(handles.final_data(myframe, :)) % displays properly

    guidata(handles.hFigure, handles) % not updating handles??
end

为了以防万一，这里是完整的功能

function handles = AnnotateVideo(filepath) 

    % Get some initial data from the video
    filepath = fullfile(filepath);

    % Get file duration

    v = VideoReader(filepath);
    handles.duration = v.Duration;
    handles.frameRate = v.FrameRate;
    delete(v)

    total_frames = ceil(handles.duration * handles.frameRate) - 1;


    %% Make some variables

     handles.final_data.frameID = (1:total_frames)';
     handles.final_data.behavior = strings(total_frames, 1);

     % change format to table
     handles.final_data = struct2table(handles.final_data);

    % Place Holder for behavior


    %% Build the Figure/GUI

    % Video will be kept on handle
    handles.filepath = filepath; 
    % Create figure to receive activex 
    handles.hFigure = figure('position', [50 50 1300 560], ...
                             'menubar', 'none', 'numbertitle', 'off', ...
                             'name', ['Video: ' filepath],...
                             'tag', 'VideoPlay', 'resize', 'on'); 

    % Create play/pause and seek to 0 button 
    handles.hTogglePlayButton = uicontrol(handles.hFigure, ...
                                          'position', [0 540 80 21], ...
                                          'string', 'play/pause', 'callback',...
                                          @TogglePlayPause); 
    handles.hSeekToZeroButton = uicontrol(handles.hFigure, ...
                                          'position', [81 540 80 21], ...
                                          'string', 'begining', 'callback',...
                                          @SeekToZero); 

    handles.hGoToStartFrameButton = uicontrol(handles.hFigure, ...
                                          'position', [161 540 80 21], ...
                                          'string', 'StartFrame', 'callback',...
                                          @SeekToStartFrame);   

    handles.hGoToEndFrameButton = uicontrol(handles.hFigure, ...
                                          'position', [241 540 80 21], ...
                                          'string', 'EndFrame', 'callback',...
                                          @SeekToEndFrame);                                        

%% Annotate button

    handles.hAnnotateButton = uicontrol(handles.hFigure, ...
                                          'Style', 'radiobutton', ...
                                          'position', [980 320 100 41], ...
                                          'String', 'Annotate', 'callback',...
                                          @Annotate);
   handles.hNotAnnotateButton = uicontrol(handles.hFigure, ...
                                       'Style', 'radiobutton', ...
                                       'position', [1100 320 100 41], ...
                                       'String', 'Not-Annotate', ...
                                       'Value', 1, ...
                                       'callback', @NotAnnotate);



%% Make radio buttons for ethogram

handles.radio(1) = uicontrol('Style', 'radiobutton', ...
                           'Callback', @myRadio, ...
                           'Units',    'pixels', ...
                           'Position', [980, 500, 80, 22], ...
                           'String',   'Non-specific', ...
                           'Value',    0);
handles.radio(2) = uicontrol('Style', 'radiobutton', ...
                           'Callback', @myRadio, ...
                           'Units',    'pixels', ...
                           'Position', [980, 480, 80, 22], ...
                           'String',   'Rearing', ...
                           'Value',    0);

handles.radio(3) = uicontrol('Style', 'radiobutton', ...
                           'Callback', @myRadio, ...
                           'Units',    'pixels', ...
                           'Position', [980, 460, 80, 22], ...
                           'String',   'Snif', ...
                           'Value',    0);

handles.radio(4) = uicontrol('Style', 'radiobutton', ...
                           'Callback', @myRadio, ...
                           'Units',    'pixels', ...
                           'Position', [980, 440, 80, 22], ...
                           'String',   'Retrieving', ...
                           'Value',    0);                       

handles.radio(5) = uicontrol('Style', 'radiobutton', ...
                           'Callback', @myRadio, ...
                           'Units',    'pixels', ...
                           'Position', [1100, 500, 80, 22], ...
                           'String',   'Self-Groom', ...
                           'Value',    0); 


%% Activex control for VLC player

    % Create activex control 
    handles.vlc = actxcontrol('VideoLAN.VLCPlugin.2', [0 0 960 540], handles.hFigure); 
    % Format filepath so that VLC can use it


    % Read into vlc

    filepath = ['file://localhost/' filepath]; 


    % Add file to playlist 
    handles.vlc.playlist.add(filepath); 

    % Play file 
    handles.vlc.playlist.play(); 
    % Deinterlace 
    handles.vlc.video.deinterlace.enable('x'); 
    % Go back to begining of file 
    handles.vlc.input.time = 0; 


   % Register an event to trigger when video is being played regularly 
   handles.vlc.registerevent({'MediaPlayerTimeChanged', @MediaPlayerTimeChanged}); 

   % Position changed
   handles.vlc.registerevent({'MediaPlayerPositionChanged', @MediaPlayerPositionChanged});

   % Save handles 
   guidata(handles.hFigure, handles); 


%% Helper functions and button callbacks    


   function MediaPlayerPositionChanged(varargin)
   hFigure = findobj('tag', 'VideoPlay');
   handles = guidata(hFigure);

   % Get position
   handles.mypos = handles.vlc.input.Position;

   % Get frame
   handles.myframe = handles.vlc.input.Time;

   % If position is changing AND annotate button is 'ON' (value == 1)
   % Annotate
   will_annotate = get(handles.hAnnotateButton, 'Value');

   if(will_annotate)
   Annotate
   end

   end

%% Display running time in application title 

    function MediaPlayerTimeChanged(varargin) 
   hFigure = findobj('tag', 'VideoPlay'); 
   handles = guidata(hFigure); 

   myframe = handles.vlc.input.Time;

   set(hFigure, 'name', [handles.filepath ' ; ' num2str(myframe/1000) ' sec.']);

    end

%% Annotate: MAIN 'Looping' Function
% called when position is changed and annotate button

        function Annotate(varargin)

            hFigure = findobj('tag', 'VideoPlay');
            handles = guidata(hFigure);

            % change value of the orther button to 0
            set(handles.hNotAnnotateButton, 'Value', 0);

            mypos = handles.vlc.input.Position;
            behavior = handles.Behavior;

            % Calculate frame
            myframe = ceil(handles.vlc.input.Time/1000 * handles.frameRate) - 1;

            handles.final_data.behavior(myframe) = behavior;

            display(handles.final_data(myframe, :))

            guidata(handles.hFigure, handles)
        end

 %% Not annotate, basic placeholder to not annotate   

    function NotAnnotate(varargin)    
        hFigure = findobj('tag', 'VideoPlay');
        handles = guidata(hFigure);
        % change value of the orther button to 0
        set(handles.hAnnotateButton, 'Value', 0);
    end


    function TogglePlayPause(varargin) 
        % Toggle Play/Pause 
        hFigure = findobj('tag', 'VideoPlay'); 
        handles = guidata(hFigure); 
        handles.vlc.playlist.togglePause(); 
    end

    function SeekToZero(varargin) 
        % Seek to begining of file 
        hFigure = findobj('tag', 'VideoPlay'); 
        handles = guidata(hFigure); 
        handles.vlc.input.Time = 0; 
    end

    function SeekToStartFrame(varargin) 
        % Seek StartFrame of file 
        hFigure = findobj('tag', 'VideoPlay'); 
        handles = guidata(hFigure); 
        handles.vlc.input.Time = StartFrame; 
    end

    function SeekToEndFrame(varargin) 
        % Seek to EndFrame of file 
        hFigure = findobj('tag', 'VideoPlay'); 
        handles = guidata(hFigure); 
        handles.vlc.input.Time = EndFrame;
     end

    function myRadio(RadioH, EventData)
        handles = guidata(RadioH);
        otherRadio = handles.radio(handles.radio ~= RadioH);
        set(otherRadio, 'Value', 0);
        set(handles.hAnnotateButton, 'Value', 0);
        handles.Behavior = RadioH.String;
        sprintf('Switching to...%s', handles.Behavior)
        guidata(handles.hFigure, handles)
    end 


% End of global function


    end

Answer 1

这是因为输出变量永远不会用新的 guidata 更新...

运行你的程序:

handles = AnnotateVideo(<filepath>)

您可以使用(从命令行)更新结构句柄:

handles = guidata(handles.hFigure);