Open txt file with UI control and pass to Class

Good eve everybody,

Im trying to create an app to visualize data from a huge array. This array is stored in a CWF file but I can open it in notepad and read it easily so I gues I should be able to open it with a press on a button and start the OpenDialog select the file and pass the data to a class so I can extract all the data I need. Well it look easy but for some kind of reason I make a mistake and maybe someone can point out what I do wrong.

% So this code opens the dialog and I'm able to select the file I need. I
% expect that the file will be imported into A. Load data is a class where
% I want to exract everything.
function LoadChannel1ButtonPushed(app, event)
    [file,path] = uigetfile('*.cwf');
    if isequal(file,0)
       disp('User selected Cancel');
    else
       A = importdata(file, ' ')
       app.LoadData(A);
       
    end
end

Unfortunately I get the error message 'unable to open file' , I have tried also the path together with the file but no luck. But when I code the load function with the path including the filename all goes well.

I think I make a mistake with file but I don;t see what.

Thanks for the help in advance

Answer 1

[Aditya]

Hi Raymond,

The issue you're encountering is likely due to the fact that "importdata" requires the full path to the file, not just the filename. When you use "uigetfile", it returns both the filename and the path separately. You need to concatenate them to form the full file path before passing it to "importdata". Here's how you can modify your code:

function LoadChannel1ButtonPushed(app, event)
    [file, path] = uigetfile('*.cwf');
    if isequal(file, 0)
        disp('User selected Cancel');
    else
        fullFilePath = fullfile(path, file); % Combine path and file
        A = importdata(fullFilePath, ' '); % Use the full path
        app.LoadData(A); % Pass the data to your class method
    end
end

I hope this helps!