How to check the lenght of the characters in a file and how to save it using GUI

I have read a .txt file in GUI , in another function I want to check if the file has less than 33 characters or not ,If it is less than 33 I want to save the file

function file_Callback(hObject, eventdata, handles)
[Filename,Pathname] = uigetfile('*.txt','Select Text File');
if isequal(Filename,0)
   disp('User selected Cancel')
else
    handles.f_id=fopen(Filename,'r');
    handles.filename_txt=strcat(Pathname,Filename);
    guidata(hObject,handles);
    set(handles.text_path,'String',handles.filename_txt);
    dr=dir(handles.filename_txt); size=num2str(dr.bytes);
    filesize=strcat(size,' bytes');
    set(handles.text_size,'String',filesize);
end

function Encode_Callback(hObject, eventdata, handles)
if length(text_path)<33
            handles.textLabel = sprintf('Message to short');
            set(textLabel, 'String', textLabel);
            return;
end
end

How to pass the entire file and check its length in the Encode_Callback is less than 33

Answer 1

[Adam Danz]

Quite a bit of guess-work going on here regarding your GUI and what it's doing but, ... (see comments)

function file_Callback(hObject, eventdata, handles)
[Filename,Pathname] = uigetfile('*.txt','Select Text File');
if isequal(Filename,0)
    disp('User selected Cancel')
else
    handles.filename_txt = fullfile(Pathname, Filename);  % use fullfile() to combine path and filename
    set(handles.text_path,'String',handles.filename_txt);
    fr = fileread(handles.filename_txt);  % fileread is easier to implement and meets your needs
    handles.filesize = numel(fr); % simply count characters (numeric output) not bytes
    set(handles.text_size,'String',num2str(handles.filesize));  % Convert number -> char
    guidata(hObject,handles); % Update handles at the end
end
    function Encode_Callback(hObject, eventdata, handles)
        if handles.filesize < 33  % no need for length()
            handles.textLabel = sprintf('Message to short');
            set(textLabel, 'String', textLabel);  % ??????? no idea what this is/does
            return;
        end
    end
end

[Kaavya N]

Thanks

[Kaavya N]

How to pass the file to a function say encode() and save it in a file using GUI

[Adam Danz]

Check out documentation for guidata

When you save a variable to a field in "handles", and use guidata afterwards, you can access it in any other gui function.

[Kaavya N]

function Encode_Callback(hObject, eventdata, handles)
if handles.filesize<33
    handles.textLabel = sprintf('Message to short');
    %set(textLabel, 'String', textLabel);
    return;
end
Encode_path = Encode(handles.filename_txt);   %how to pass the file read in file_callback to                 Encode( )
% peform the above operation and save that file
waitfor(msgbox('Select path to save'));
[file,path,indx] = uiputfile('encrypted-msg.txt');
if isequal(file,0)
    disp('User selected Cancel')
end

I want to pass the file into a fuction called ecode that is present in encode_callback and display file path in static text of GUI.

[Adam Danz]

What does it mean to "pass the file? I assum you want to pass the file's path and name. After file_Callback is called, if the user selected a file then handles.filename_txt should contain the full file path.

Encode(handles.filename_txt,...)

[Kaavya N]

I want to perform encoding on the contents of the file , so if I give path of the file path and name that i selected in file_callback will all the contents of the file be passed

[Adam Danz]

Ah, so you want to pass the file content. I suggest you pass the file path/name as shown in my previous comment and then read-in the file within the function.

My answer uses fileread to read the file and that returns one long character array of the entire file. You may need to read the file differently depending on how you plan to analyze it.