Using App Designer, saving (and loading) data from the Edit Fields of the GUI to a file?

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Scotty Mac 2023-4-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1951598-using-app-designer-saving-and-loading-data-from-the-edit-fields-of-the-gui-to-a-file

评论： Scotty Mac 2024-10-20

采纳的回答： Rik

在 MATLAB Online 中打开

I have several numeric edit fields in my gui. How do I go about saving the entered data to a text file?

I want to be able to save the entered values for the above Center Freq and Bandwidths to a file so I can recall them at a later time. Those fields are app.NumericEditField_CenterFreq1, app.NumericEditField_Bandwidth1, app.NumericEditField_CenterFreq2, etc.

I have save and load buttons, and understand I need to place code in the call backs of those buttons, but I haven't been able to find any good examples. I tried the below, but it saves it to a .mat file, which is unreadable in a text error. Is there an easier way to save and then load the data to and from my edit fields?

        function SaveButtonPushed(app, event)
            props = properties(app);
            lp    = length(props);
            values   = cell(1,lp);
            visibilities   = cell(1,lp);
            
            for i = 1:lp
                propName = props{1};
                property = app.(propName);
                if isprop(property, 'Value')
                    values{i} = app.(propName).Value;
                end
            end          
            
            file = uiputfile('*.mat', "Save Message" );
            
            if file
                save(file, 'props', 'values', 'visibilities');
            end

The above saves data, but not sure if it is correct since it is unreadable. When I try and load, I dont get anything in the edit fields:

        function LoadButtonPushed(app, event)
            [file,path] = uigetfile('*.mat');
            selectedfile = fullfile(file);
            data=load(selectedfile);
        end

Thanks in advance!

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Answer 1

Rik 2023-4-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1951598-using-app-designer-saving-and-loading-data-from-the-edit-fields-of-the-gui-to-a-file#answer_1221278

Your loading function needs to load the file, and then set the values of the fields. It currently only does the former.

A mat file is not a text file. You can examine the contents with Matlab (or even Octave), but not with text readers. If you want a text file, you may consider converting to JSON.

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Scotty Mac 2023-4-24

编辑：Scotty Mac 2023-4-24

在 MATLAB Online 中打开

I am trying to grab the values out of the editfields (CenterFreq1, CenterFreq2, etc.) and save them with my 'save button' and in a clear readable text file, like:

{"editfield1":"CenterFreq1","editfield1_value":1500,"editfield2":"CenterFreq2","editfield2_value":2500}

Then load that file to populate the those edit fields (load button).

I dropped the ('props',props, 'values',values, 'visibilities',visibilities) objects, since they didn't hold my values. I want the easiest and most straight forward way.

This what I have so far...

Then for my load, I can just assign the CenterFreq1 back to my editfield after reading in the file (not implemented yet). Is this the correct method to do the load/save?

CenterFreq1 = str2double(app.EditField_CenterFreq1.Value);
CenterFreq2 = str2double(app.EditField_CenterFreq2.Value);
panelStruct=struct();           
panelStruct.CenterFreq1 = CenterFreq1;
panelStruct.CenterFreq2 = CenterFreq2;
panelStructString = jsonencode(panelStruct);
% Write to a json file
fid = fopen('test1.json', 'w');
fprintf(fid, '%s', panelStructString);
fclose(fid);

Scotty Mac 2024-10-19

在 MATLAB Online 中打开

Hello,

I am using JSON for loads and saves. Here is my Load button call back function:

function LoadButtonPushed(app, event)
% Allow the user to select any JSON file
[file,path] = uigetfile('*.json');
if isequal(file,0)
    % User selected cancel
    return;
else
    jsonText = fileread(fullfile(path,file));
end           
% Convert JSON formatted text to MATLAB data types
jsonData = jsondecode(jsonText);
app.EditField_NotchCenterFreq1_LB.Value = num2str(jsonData.NotchCenterFreq1_LB);
app.EditField_NotchBandwidth1_LB.Value = num2str(jsonData.NotchBandwidth1_LB);
end

Here is my Save button function:

I grab the values from the entry fields, put them into variables, place them in a struture, and then write to a JSON file.

    function SaveButtonPushed(app, event)
        % Grab the value of the Waveform dropdown selection for Low Band
        waveform_LB = app.WaveformDropDown_LB.Value;
        
        % Grab the value of the selected radio button for Low Band
        timingProtocol_LB = app.TimingProtoclButtonGroup_LB.SelectedObject.Text;
        
        % Create the Json Structure
        panelStruct=struct();
        
        panelStruct.WaveformDropDown_LB = waveform_LB;
        panelStruct.TimingProtocol_LB = timingProtocol_LB;
        
        % Encode the structure into a JSON string
        panelStructString = jsonencode(panelStruct);
        
        % Write to a json file (Prompt user for filename)
        [filename, pathname] = uiputfile('*.json','Save Parameters');
        path_file = fullfile(pathname, filename);
        fid = fopen(path_file,'wt');
        fprintf(fid, '%s', panelStructString);
        fclose('all');       
    end

Samuel 2024-10-19

Thank you very much. It worked

Scotty Mac 2024-10-20

Great! Anytime.

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Using App Designer, saving (and loading) data from the Edit Fields of the GUI to a file?

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