Creating a file upload option/button in App designer

Hi all

I am currently using MATLAB App designer to create a waveform generator user interface, and the idea is apart from some standard fucntion been selected and hence generated, i.e. sine/cosine, the interface should also allow user to upload their interested signals such as modulated signal. Therefore I would like to create such a function using App desinger so that when the user click on the button, a file viewing window could pop up for file uploading.

Would someone could give me some hints how I am able to achieve this? Many thanks.

Kind regards,

Chen

Answer 1

[Adam Danz]

1. Create the button in your GUI (drag and drop the button onto the designer workspace)
2. Right click the button, hover over 'callbacks', select 'AddButtonPushedFcn callback'.
3. From the code view that will open after adding the callback function, use matlab's uigetfile function.

        % Button pushed function: Button
        function ButtonPushed(app, event)
            [file,path] = uigetfile('*.mat')  %open a mat file
        end

See uigetfile documentation for more options.

[Georgios Galatis]

How can I have the path displayed in a text box? Basically haw can I manipulate the path?

[Adam Danz]

Add a text edit field or a text area to your app. Then control the "Value" property as shown below.

app.TextObject.Value = fullfile(path, file); 

[Emily]

Could this be modified to open an .xls file or is this specific to .mat files?

[Adam Danz]

No, you could change the file extension '*.mat' to specify the type of file you'd like to open or any other type of filter. It's quite flexible.

https://www.mathworks.com/help/matlab/ref/uigetfile.html#d124e1595914

Answer 2

[Sergio Prado Raposo]

How can I make it so that when I try to open a file with another extension, it shows an error box and if it is the correct one, it shows a correct text box?