parfeval with backgroundpool and ftp and mget

Hi, I want to download a file via ftp, and display the progress during download. This works with websave, but I can't get it to work with ftp. Is this not supported, or am I doing something wrong...?

The error message in ME is:

ME =

MException with properties:

identifier: 'MATLAB:string:MissingNotSupported'

message: '<missing> string element not supported.'

cause: {}

stack: [3×1 struct]

Correction: []

function FetchPylon()
		FileName = 'pylon.exe';
		FilePath=userpath;
		ftpobj = ftp('sl290.web.hostpoint.ch','[e-mail]');
		F = parfeval(backgroundPool,@download_stuff,1,ftpobj,FileName,FilePath);
		pause(1)
		[ME]=fetchOutputs(F)

		fig = uifigure;
		fig.Visible='off';
		fig.Position = [680   687   444   191];
		movegui(fig,'center');
		fig.Resize='off';
		fig.WindowStyle = 'modal';
		fig.Visible='on';
		d = uiprogressdlg(fig,'Title','Please Wait','Message','Downloading OPTOcam driver','Cancelable','on');
		progress=0;
		cancelled=0;
		while strcmpi (F.State, 'running')
			s = dir(fullfile(FilePath,FileName));
			if ~isempty(s)
				filesize = s.bytes;
				progress= (filesize/1028320736);
				d.Value=progress;
				d.Message = ['Downloading OPTOcam driver (' num2str(round(filesize/1024/1024)) ' / ' num2str(round(1028320736/1024/1024)) ' MB done).'];
			end
			if d.CancelRequested
				cancel(F)
				cancelled=1;
				break
			end
			pause(0.25)
		end
		close(d)
		close(fig)


function [ME]=download_stuff (ftpobj,FileName,FilePath)
try
	mget(ftpobj,FileName,FilePath);
catch ME
end
pause(1)
close(ftpobj)
clearvars('ftpobj')

[William Thielicke]

It seems like mget is not working with a thread based environment as required by backgroundpool. Websave has this kind of support:

https://www.mathworks.com/help/matlab/referencelist.html?type=function&capability=threadsupport

[Mike Croucher]

I'll add an enhancement request for mget and thread-based environments to our internal database.