Saving data in a GUI callback function

I don't fully understand how to save data acquired through a GUI callback function, so I can use in another callback function. I want to save some variables in one function, everytime it is run, and then when another button is pushed all these data are written to an Excel file. I've tried the guidata function, but I don't really understand how to use hObject or handles. I've also found other functions for this, but it's unclear to me how to use them.

function SnapshotButtonPushed(app, event)
            
            ind = app.SamplenumberEditField.Value;
            
            %% Make picture
            im = f_camera();
            
            %% Detection
   
            amount = f_detect

            %% Save endtime and concentration to excel file
           
            table_amount{ind} = amount;
            table_conc{ind} = concentration;
            table_endtimes{ind} = datestr(now,'HH:MM:SS');
            hObject= %?
            guidata(hObject,struct(ind, table_amount, ind, table_conc, ind,table_endtimes)); %Is this correct?
            
function ButtonPushed2(app, event)
    ind = app.SamplenumberEditField.Value;
            table_sample{ind} = ind;
            table_name{ind} = 'name';
            filename = 'Format.xlsx';
            
            xlswrite('Format.xlsx',table_name,'Sheet1','A2')
            xlswrite('Format.xlsx',table_sample,'Sheet1','B2')         
            xlswrite('Format.xlsx',table_endtimes,'Sheet1','G2')
            xlswrite('Format.xlsx',table_amount,'Sheet1','H2')
            xlswrite('Format',table_conc,'Sheet1','I2')
            winopen('Format.xlsx')

Answer 1

[Mohammad Sami]

With app designer you don't need guidata and hobject to store your data.

Create properties in your app and then you can access them from inside any app function using app.propertyname.

For more information read the documentation here

https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html

For example

function f1(app)
    % .... %
    app.table_name = some_table
    % .... %
end

function f2(app)
    % .... %
    xlswrite('Format.xlsx',app.table_name,'Sheet1','A2');
    % .... %
end