MATLAB: How to use waitbar to show file copying status

progressbarwaitbar

This is my code under a push button in GUI. I want that it should show the progress of the file copying status with the use of "waitbar" command or by any other means .It will be very helpful if someone can provide a sample code, though help are available in matlab but I m unable to figure it out how it can be used for displaying file copying status. Thanks

% --- Executes on button press in pushbutton44.
function pushbutton44_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton44 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global dirpath_import;
dirpath_import= uigetdir();
set(handles.edit38,'String',dirpath_import);
importpath=get(handles.edit38,'String');
exportpath=get(handles.edit1,'String');
copyfile(importpath,exportpath);
msgbox('Import/Copy Complete');

Best Answer

While it does not matter, that the code is part of a callback, the relevant part is only:

copyfile(importpath, exportpath)

During this command Matlab is blocked an there is no chance for any progress indicators. If this is really required, you can create your own function to copy the file in blocks of e.g. 1MB:

function myCopyFile(source, dest)
FileInfo = dir(source);
FileSize = FileInfo.bytes;
waitH    = waitbar(0, sprintf('Copying %.2f MB', FileSize/1e6);
inFID = fopen(source, 'r');
if inFID == -1
  error('Cannot open file for reading: %s', source);
end
outFID = fopen(dest, 'w');
if outFID == -1, 
  fclose(inFID);
  error('Cannot open file for writing: %s', dest);
end
chunk  = 1e6;
nChunk = ceil(FileSize / chunk);
iChunk = 0;
while ~feof(inFID)
  iChunk = iChunk + 1;
  waitbar(iChunk / nChunk, waitH);
  data = fread(inFID, chunk, '*uint8');
  fwrite(outFID, data, 'uint8');
end
fclose(inFID);
fclose(outFID);
end

UNTESTED

Attention: File handling is a critical job. If the disk is full or the destination is on a network drive and loosing the connection, this cheap and naive implementation of a copyfile does not show a warning and might leave the file system in a corrupted state. The user can kill the copying by Ctrl-c also. I would not dare to do this in a productive system. Care for backups. Check the file system. Insert consistency checks, e.g. by counting the number or read and written bytes by catching the output of fread and fwrite.

Related Solutions

MATLAB: Load a file with gui and use it on another callback

You forgot to save the variables to the struct and to save the struct back to guidata at the end of your browser2 callback, and you forgot to actually load the variable from the struct.

function browser2_Callback(hObject, eventdata, handles)
[filename pathname] = uigetfile({'*.txt'},'File Selector');
fullpathname=strcat(pathname,filename);
text = fileread(fullpathname);
set(handles.text7,'String',fullpathname)
set(handles.text8,'String',text)
filename=fullfile(fullpathname);
R=readtable(filename)
handles.B=table2array(R)
guidata(hObject,handles)
function compute_Callback(hObject, eventdata, handles)
B=handles.B;
for i=1:1:9
    x=B(i).*5;
    disp(x)

MATLAB: How to use path- and filename from GUI in matlab script

Thore - rather than using global variables, try changing your script into a function which accepts the path to and name of some file. For example,

 function FixedLineString(filename, pathname)
 if isempty(filename) || isempty(pathname) 
     [filename,pathname] = uigetfile('*.DAT','Select the .DAT file');
 end
 % etc.

The above code allows for the filename and pathname to be optional so that if at least one is not provided, then the user is prompted to choose a file.

Now in your GUI, you would save the path to and the name of the file to your handles structure as

 function pushbutton1_Callback(hObject, eventdata, handles)
 [filename, pathname] = uigetfile('*.DAT');
 set(handles.text3, 'String', filename);
 handles.filename = filename;
 handles.pathname = pathname;
 guidata(hObject,handles);

Then, when you want to pass the path and name of the file to your (new) function, you would do

 function Start_button_Callback(hObject, eventdata, handles)
 pathname = [];
 filename = [];
 if isfield(handles,'pathname') && isfield(handles,'filename')
    pathname = handles.pathname;
    filename = handles.filename;
 end
 FixedLineString(pathname,filename);

In the above, we check to make sure that handles has fields for both pathname and filename before trying to access either. If both exist, then we pass both to your function. Else we pass empty input parameters which will cause your function to request the the user choose a file.

Try the above and see what happens!

As an aside, I noticed that in your callbacks you typically did

 handles = guidata(hObject);

This is unnecessary as the third input to all callbacks is already the handles structure and so calling the above just duplicates what already has been done. Also, you only need to call

 uidata(hObject, handles);

if you have updated the handles structure as we did in pushbutton1_Callback. Otherwise, there is no need to call it.

Best Answer

Related Solutions

MATLAB: Load a file with gui and use it on another callback

MATLAB: How to use path- and filename from GUI in matlab script

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