I can't retrieve the user input information in a table when the user closes the table.

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Feri 2020-3-9

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评论： Adam Danz 2020-3-10

Hello,

I am trying to collect the information of a popup uitable in MATLAB GUI with the DeleteFcn property, but it keeps giving me this error:

Unrecognized function or variable 'MyDeleteFcn'.

f = figure('Name','Info.','NumberTitle','off');
set(gcf, 'Units', 'Inches', 'Position', [7, 3, 3.8, 6], 'PaperUnits', 'Inches', 'PaperSize', [16, 9.0]);
t = uitable(f,'Position',[10 5 400 565],'ColumnWidth',{150,150},'ColumnEditable',[false true], 'DeleteFcn','data = MyDeleteFcn(gcbo)');
set(t,'Data',[matrix1, matrix2]); % Use the set command to change the uitable properties.
set(t,'ColumnName',{'';''});
uiwait

However, I defined this function earlier in the GUI

function data = MyDeleteFcn(t)
data = get(t,'Data');

Could anyone tell me what is it that I'm doing wrong?

My goal is to collect the information of a popup uicontrol as soon as the user closes the table in a GUI.

Any help is much appreciated.

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Answer 1

Adam Danz 2020-3-9

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编辑：Adam Danz 2020-3-9

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Callback functions do not return outputs. You must store the values somewhere and then retreive them. Here's a solution to this problem:

Step 1: Pass the GUI handle in to the delete function

mainGUIhandle is a handle to the main GUI figure.

% Create the UITable and its parent figure
f = figure('Name','Info.','NumberTitle','off');
t = uitable(f,'DeleteFcn', {@MyDeleteFcn, mainGUIhandle}); % mainGUIhandle is handle to main GUI
set(t,'Data',rand(10,3));

Step 2: Define delete function, store UITable data in main GUI

function data = MyDeleteFcn(hObj, event, GUIhandle)
  data = hObj.Data;             % Get data from UI table
  dat = guidata(GUIhandle);     % Get data stored in main GUI (if any)
  dat.data = data;              % Store the UI table data
  guidata(GUIhandle, dat)       % Load the data into the main GUI

Step 3: Retrieve data from any callback function that has access to the main GUI handle

mainGUIhandle is a handle to the main GUI figure.

  % From any callback function that has access to the main GUI figure handle
  dat = guidata(mainGUIhandle);
  dat.data  % This is the UITable data

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Feri 2020-3-9

在 MATLAB Online 中打开

This is the part of the GUI I am now:

if ischar(Header{1,1}) == 0  % checks for the proper heading
    
    selection = questdlg( ...
      'Do you want to manually enter Information?','Wrong header info.', ...
      'Yes','No','No');
  
    switch selection
        case 'Yes'
            matrix1 = {'Device';'Motion Profile';'Size'; 'Pitch'; 'Surface Form'; 'Nominal ROC'; 'Sensor Sampling'; 'Scan Velocity'; 'k'; 'c';...
                'A1'; 'A2'; 'A3'; 'A4'; 'A5'; 'A6'; 'A7'; 'A8'; 'A9'; 'A10'; 'A11'; 'A12'; 'A13'; 'A14'; 'A15'; 'A16'; 'A17'; 'A18'; 'A19'; 'A20'; };
            matrix2 = {''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''; ''};
 
            f = figure('Name','Info.','NumberTitle','off');
            set(gcf, 'Units', 'Inches', 'Position', [7, 3, 3.8, 6], 'PaperUnits', 'Inches', 'PaperSize', [16, 9.0]);
            handles.t = uitable(f,'Position',[10 5 400 565],'ColumnWidth',{150,150},'ColumnEditable',[false true]);
            set(handles.t,'Data',[matrix1, matrix2]); % Use the set command to change the uitable properties.
            set(handles.t,'ColumnName',{'';''});
            uiwait
            
        case 'No'
            mb = msgbox('Cannot continue', 'Error','Error');
            return   
    end
end

Feri 2020-3-10

在 MATLAB Online 中打开

Yes, I am using GUIDE, and I changed the mainGUIhandle to "handles" as the input arguments,

function Tdata = MyDeleteFcn(hObject, eventdata, handles)
Tdata = hObject.Data;             % Get data from UI table
dat = guidata(handles);     % Get data stored in main GUI (if any)
dat.Tdata = Tdata;              % Store the UI table data
guidata(handles, dat)       % Load the data into the main GUI

this is defined inside the main body of the GUI,

then in a push button the data is to be stored

f = figure('Name','Info.','NumberTitle','off');
set(gcf, 'Units', 'Inches', 'Position', [7, 3, 3.8, 6], 'PaperUnits', 'Inches', 'PaperSize', [16, 9.0]);
t = uitable(f,'Position',[10 5 400 565],'ColumnWidth',{150,150},'ColumnEditable',[false true], 'DeleteFcn', {@MyDeleteFcn, handles});
set(t,'Data',[matrix1, matrix2]); % Use the set command to change the uitable properties.
set(t,'ColumnName',{'';''});
dat = guidata(handles);
dat.Tdata  % This is the UITable data

I appreciate you taking the time to respond to me, and am really trying to understand the logic...Just can't make it work

Adam Danz 2020-3-10

在 MATLAB Online 中打开

handles.data isn't assigned until you delete the UITable. If there's a part of your code that tries to reference handles.data prior to creating and deleting the UI table, the data field will not exist in the handles structure.

There are two ways around that.

1) Create a default value for handles.data in your opening function. It could be something like,

handles.data = zeros(100,3);  % Or whatever size you expect; or maybe nan(100,3)
guidata(handles.figure1, handles)  

2) Only access handles.data when data is a field in handles. This condition below can be placed anywhere in your code that tries to access that field.

if isfield(handles,'data')
    % your code here
else
    % whatever your default action is.  
    % Example 1
    return  % leave the callback function
    % Example 2
    warning('No ''data'' field in handles')  % Throw a warning
    % etc....
end

BTW, you should rename variables so they make sense to you. I noticed your delete function was the same name I used: MyDeleteFcn. That's generic and not descriptive. A better name would be UITableDeleteFcn. Same goes with warning messages etc.

Feri 2020-3-10

I found the issue, I didn't follow your step 3 completely. Slow learner.

Thanks a million.

Adam Danz 2020-3-10

Good work!

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Answer 2

Walter Roberson 2020-3-9

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在 MATLAB Online 中打开

When you use a quoted string to define a callback, the statement is evaluated inside the base workspace. It can only access functions that are defined as the first function inside of a .m file because it is not evaluated within the scope of your gui.

Adam has given you some good advice.

There is a hack, though: you can use

assignin('base', 'MyDeleteFcn', @MyDeleteFcn)

Then when the callback executes within the base workspace, the MyDeleteFcn that is seen in the base workspace is the function handle to the internal function.

The variable assigned to in the callback string will go into the base workspace.

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Feri 2020-3-9

Thank you.

I should have everything inside the GUI, would you be able to help me with how to edit my code, so that the table information is saved in Swith Case 'Yes' when the user closes the table?

Thanks a million.

Adam Danz 2020-3-10

I didn't know about this, Walter. Thanks! What advantage is there for using this syntax? It seems limited and even difficult to debug, unless I'm not understanding it correctly. I'll have to tinker with it some time.

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