Error downloading .txt or .nc files through the ftp link

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Farshid Daryabor
Farshid Daryabor 2020-1-8
评论： Farshid Daryabor 2020-2-4
By using the following function;
>> ftpobj = ftp('ftp://nrt.cmems-du.eu/Core/INSITU_GLO_NRT_OBSERVATIONS_013_030/glo_multiparameter_nrt/index_monthly.txt',username,password,'System','UNIX')
I am encountering with the error message, I reaaly appreciate any help.
Error using connect (line 18)
Could not open a connection to "ftp", port "NaN".
Error in ftp (line 75)
connect(h)
Thanks
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Geoff Hayes
Geoff Hayes 2020-1-8
Farshid - please see ftp host input parameter to get an idea of how the host should be constructed. You seem to be passing a link to a file rather than the name of the FTP server (with or without the port).

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回答（2 个）

Andrew Janke
Andrew Janke 2020-1-31
Geoff is right. You're passing a URL to ftp(), when it only accepts host names. You need to do the directory navigation and file selection in a separate step once you're connected. Try this:
remote_dir = 'Core/INSITU_GLO_NRT_OBSERVATIONS_013_030/glo_multiparameter_nrt';
remote_file = 'index_monthly.txt';
f = ftp('nrt.cmems-du.eu',username,password);
cd(f, remote_dir)
mget(f, remote_file)
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Farshid Daryabor
Farshid Daryabor 2020-2-3
could you show me example to run?
f = jl.net.ftp.FtpClient('Core/INSITU_GLO_NRT_OBSERVATIONS_013_030/glo_multiparameter_nrt')
Undefined variable "jl" or class "jl.net.ftp.FtpClient".
Geoff Hayes
Geoff Hayes 2020-2-3
Farshid - I modified your above comment to remove the host, username, and password from the code. I strongly recommend that you don't post such information on a public forum.

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Farshid Daryabor
Farshid Daryabor 2020-2-3
what do you mean? You mean to add "Ftp Client.m" to the path and run it?
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Andrew Janke
Andrew Janke 2020-2-3
Aha: You need to use Passive Mode. (Which is the whole reason I wrote that FtpClient in the first place.)
f = jl.net.ftp.FtpClient('nrt.cmems-du.eu', [], my_username, my_password);
f.connect;
f.pasv;
f.cd(remote_dir);
f.mget(remote_file);
Farshid Daryabor
Farshid Daryabor 2020-2-4
Dear Andrew,
I'm really sorry for the delay in feedback. I actually added "class" and "toplevel" packages to the path. However, I did find some imbalance errors in "FtpClient" which I cleaned some of, but in the list below some errors have confused me to clear. Could you please tell me how I can fix it, thanks in advance.
% Remote host to connect to
host (1,1) string = string(missing)
% Port for the command port
port (1,1) double = NaN
% Username to log in as. Defaults to 'anonymous'.
username (1,1) string = 'anonymous'
% Password to provide. Defaults to your email address from Matlab's
% Internet prefs
password string = repmat('', [0 0])
% Account to use in addition to username and password. May be empty to
% indicate "no account"
account string = repmat('', [0 0])
end
properties(Dependent)

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