fopen gives negative fid in GUI

I started a GUI using GUIDE. I have a browse button that uses uigetdir to get path to folder where I have some excel files, that later on I will read with my script. Problem is in fopen who gives message: No such file or dir. I used debugger and went step by step and to me everything seems to be ok, file path is correctly stored, I don't know what could be the problem. I tried with uigetfile but he only gets path to specific file, and I will have maybe 400 files in that folder.

Help is greatly appreciated.

This part of the code is from gui:

function Browse_1_Callback(hObject, eventdata, handles)
% hObject    handle to Browse_1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
FileName = uigetdir;

handles.FileName = FileName;
guidata(hObject,handles)

This part from script that runs after button press:

myFolderPV = handles.FileName;
  PVFiles = dir(fullfile(myFolderPV,'*.js'));
   numfilesPV= length(PVFiles);  
  for k = 1:numfilesPV

    [fid, message] = fopen(PVFiles(k).name);
  ...

Answer 1

[Iain]

Your filename is wrong.

You need to have the full path and filename for fopen to work.

[myfolderPV '\' PVFiles(k).name] is your full filename.

[Ante]

Thank you so much!

[Jan]

Or slightly more flexible:

[fid, message] = fopen(fullfile(myFolderPV, PVFiles(k).name));