Problem with GUI for import .txt file

Hellow,

I'm trying to use the explanation of the following link to link through csv, matlab and metatrader. https://www.mql5.com/es/articles/1489

I made the first steps, but when entering the code:

% --- Executes on button press in pushBrowse.

function pushBrowse_Callback(hObject, eventdata, handles)

[fileName, filePath] = uigetfile('*.txt'); % receive and the path from the user

if fileName==0          % if it is canceled

      fileName='';        % create an empty name

      filePath='';        % create an empty path

end

fullname = [filePath fileName] % form a new name

set(handles.editPath,'String', fullname); % write in the editPath

It gives me the following error:

fullname =

H:\FXPRO4\MQL4\Files\EURUSD.txt

Attempt to reference field of non-structure array.

Error in FromfTo>pushBrowse_Callback (line 107)
set(handles.editPath,'String', fullname); % write in the editPath

Error in gui_mainfcn (line 96)
        feval(varargin{:});

Error in FromfTo (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
@(hObject,eventdata)FromfTo('pushBrowse_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

Therefore, the first step towards choosing the file path is blocked by pressing the Browse button

Anyone know what's wrong?

Thank you very much

[Adam]

Have you used the debugger to see what is happening on that line? It is usually faster than asking for an answer.

I can't see anything obviously wrong, but the error message suggests that 'handles' is not a structure which would imply that somewhere else in your code you have accidentally overwritten the handles structure with something else.

[francisco gonzalez]

I just filled out the code for the Browse button.

To check is really good, I press Browse and gives me this error.

I will say a little better, because the code suggests having also set the Start button for at least import the data and be read:

% --- Executes on button press in pushBrowse.

function pushBrowse_Callback(hObject, eventdata, handles)

[fileName, filePath] = uigetfile('*.txt'); % receive and the path from the user

if fileName==0          % if it is canceled

      fileName='';        % create an empty name

      filePath='';        % create an empty path

end

fullname = [filePath fileName] % form a new name

set(handles.editPath,'String', fullname); % write in the editPath

% --- Executes on button press in pushStart.

function pushStart_Callback(hObject, eventdata, handles)

process(handles);

% data reading, chart drawing, processing, storage

function process(handles)

fullname = get(handles.editPath, 'String'); % read the name from editPath

data = dlmread(fullname, ';', 2, 2);    % read the matrix from file

info = ['Last update: ' datestr(now)];  % form an informative message

set(handles.textInfo, 'String',info);   % write info into the status bar

high = data(:,1);   % it is now high where the first column of the data 
matrix is

low = data(:,2);    % d low -- the second

close = data(:,3);  % --/--

open = data(:,4);   %

len = length(open); % the amount of elements in open

axes(handles.axesChart); % make the axes active

hold off; % clean axes off before adding a new chart

candle(high, low, close, open); % draw candlesticks (in the current axes)

set(handles.axesChart,'XLim',[1 len]); % set limits for charting

This is the necessary code. I think it's fine, I checked many times but "Matlab" gives me error.

I started recently with GUI, but I think the code is correct

Thank you very much for your reply

[Adam]

That brings me back to my original question then of have you used the debugger? Most of the time it is obvious what the problem is by debugging so there's no point working in the dark by just trying to guess.

[francisco gonzalez]

And I used the debugging.

On line 131 I have the error:

axes(handles.axesChart);

And the message is:

"Reference to non-existent field 'axesChart'."

i dont understand this error

[Adam]

That is just running the code and getting an error though.

Debugging allows you to actually look at the 'handles' variable on the command line if you put a breakpoint in.

Then it will be obviously if 'handles' is what it is supposed to be. The error clearly tells you that 'handles' does not have that field though so double-check your axes tag.

Answer 1

[Walter Roberson]

In step 3 of that document it says to use the visual properties builder to create several objects, including:

Axes: Box – on, FontName – MS Sans Serif, FontSize – 8, Tag - axesChart.

You either did not do that or else you did not set the Tag to be exactly 'axesChart'