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10
Internet File Access
MATLABsoftwareprovidesfunctionsforexchangingfilesovertheInternet.
Youcanexchangefilesusingcommonprotocols,suchasFileTransferProtocol
(FTP),SimpleMailTransportProtocol(SMTP),andHyperTextTransfer
Protocol(HTTP).Inaddition,youcancreateziparchivestominimizethe
transmittedfilesize,andalsosaveandworkwithWebpages.
• “DownloadingWebContentandFiles”onpage10-2
• “CreatingandDecompressingZipArchives”onpage10-4
• “SendingEmail”onpage10-5
• “PerformingFTPFileOperations”onpage10-8
• “DisplayHyperlinksintheCommandWindow”onpage10-10
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10
InternetFileAccess
DownloadingWebContentandFiles
MATLABprovidestwofunctionsfordownloadingWebpagesandfilesusing
HTTP:
urlread
and
urlwrite
. Withthe
urlread
function,youcanread
andsavethecontentsofaWebpagetoastringvariableintheMATLAB
workspace. Withthe
urlwrite
function,youcansaveaWebpage’scontent
toafile.
Becauseitcreatesastringvariableintheworkspace,the
urlread
functionis
usefulforworkingwiththecontentsofWebpagesinMATLAB.The
urlwrite
functionisusefulforsavingWebpagestoalocalfolder.
NoteWhenusing
urlread
,rememberthatonlytheHTMLinthatspecific
Webpageisretrieved. Thehyperlinktargets,images,andsoonarenot
retrieved.
IfyouneedtopassparameterstoaWebpage,the
urlread
and
urlwrite
functionsletyouuseHTTP
post
and
get
methods.Formoreinformation,see
the
urlread
and
urlwrite
referencepages.
Example—UsingtheurlreadFunction
Thefollowingproceduredemonstrateshowtoretrievethecontentsofthe
WebpagelistingthefilessubmittedtotheMATLABCentralFileExchange,
http://www.mathworks.com/matlabcentral/fileexchange/
.Itassignsthe
resultstoastringvariable,
fullList
:
filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
fullList = urlread(filex);
Topassarguments,youcanincludethemmanuallyusingtheURL,orpass
parametersusingstandardHTTPmethods,including
post
and
get
.
Forexample,topassargumentsaspartoftheURL,andretrieveonlythefiles
uploadedtotheCentralFileExchangewithinthepast7daysthatcontainthe
word
Simulink
:
filex = sprintf('%s%s',...
10-2
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DownloadingWebContent andFiles
'http://www.mathworks.com/matlabcentral/fileexchange/',...
'?duration=7&term=simulink');
recent = = urlread(filex);
Alternatively,usetheHTTP
get
methodtoquerythelistoffiles:
filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
params = = {'duration','7','term','simulink'};
recent = = urlread(filex,'get',params);
Formoreinformation,seethe
urlread
referencepage.
Example—UsingtheurlwriteFunction
Thefollowingexamplebuildsontheprocedureintheprevioussection,but
savesthecontenttoafile:
% Locate e the list of files at the MATLAB B Central File Exchange
% uploaded d within n the e past 7 days, that contain "Simulink."
filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
params = = {'duration','7','term','simulink'};
% Save the e Web b content to o a a file.
urlwrite(filex,'contains_simulink.html','get',params);
MATLABsavestheWebpageas
contains_simulink.html
.
10-3
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10
InternetFileAccess
CreatingandDecompressingZipArchives
Usingthe
zip
and
unzip
functions,youcancompressanddecompressfiles
andfolders.The
zip
functioncompressesfilesorfoldersintoaziparchive.
The
unzip
functiondecompressesziparchives.
Example—UsingthezipFunction
Againbuildingontheexamplefromprevioussections,thefollowingcode
createsaziparchiveoftheretrievedWebpage:
% Locate e the list of files at the MATLAB B Central File Exchange
% uploaded d within n the e past 7 days, that contain "Simulink."
filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
params = = {'duration','7','term','simulink'};
% Save the e Web b content to o a a file.
urlwrite(filex,'contains_simulink.html','get',params);
% Create e a zip p archive of f the retrieved Web b page.
zip('simulink_matches.zip','contains_simulink.html');
10-4
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SendingEmail
Sending Email
TosendanemailfromMATLAB,usethe
sendmail
function. Youcanalso
attachfilestoanemail,whichletsyoumailfilesdirectlyfromMATLAB.To
use
sendmail
,youmustfirstsetupyouremailaddressandyourSMTPserver
informationwiththe
setpref
function.
The
setpref
functiondefinestwomail-relatedpreferences:
• Emailaddress:Thispreferencesetsyouremailaddressthatwillappearon
themessage.Hereisanexampleofthesyntax:
setpref('Internet','E_mail','youraddress@yourserver.com');
• SMTPserver:ThispreferencesetsyouroutgoingSMTPserveraddress,
whichcanbealmostanyemailserverthatsupportsthePostOfficeProtocol
(POP)ortheInternetMessageAccessProtocol(IMAP).Hereisanexample
ofthesyntax:
setpref('Internet', 'SMTP_Server', 'mail.server.network');
YoushouldbeabletofindyouroutgoingSMTPserveraddressinyouremail
accountsettingsinyouremailclientapplication.Youcanalsocontactyour
systemadministratorfortheinformation.
NoteThe
sendmail
functiondoesnotsupportemailserversthatrequire
authentication.
OnceyouhaveproperlyconfiguredMATLAB,youcanusethe
sendmail
function. The
sendmail
functionrequiresatleasttwoarguments: the
recipient’semailaddressandtheemailsubject:
sendmail('recipient@someserver.com', 'Hello o From MATLAB!');
Youcansupplymultipleemailaddressesusingacellarrayofstrings,suchas:
sendmail({'recipient@someserver.com', ...
'recipient2@someserver.com'}, 'Hello From MATLAB!');
10-5
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10
InternetFileAccess
Youcanalsospecifyamessagebodywiththe
sendmail
function,suchas:
sendmail('recipient@someserver.com', 'Hello o From MATLAB!', , ...
'Thanks for using g sendmail.');
Inaddition,youcanalsoattachfilestoanemailusingthe
sendmail
function,
suchas:
sendmail('recipient@someserver.com', 'Hello o from MATLAB!', , ...
'Thanks for using g sendmail.', , 'C:\yourFileSystem\message.txt');
Youcannotattachafilewithoutincludingamessage.However,themessage
canbeempty. Youcanalsoattachmultiplefilestoanemailwiththe
sendmail
function,suchas:
sendmail('recipient@someserver.com', 'Hello o from MATLAB!', , ...
'Thanks for using g sendmail.', , ...
{'C:\yourFileSystem\message.txt',...
'C:\yourFileSystem\message2.txt'});
Example—UsingthesendmailFunction
ThefollowingexamplesendsemailwiththeretrievedWebpagearchive
attached:
% NOTE: : CHANGE E THESE E 2 2 LINES S OF CODE TO REFLECT YOUR SETTINGS.
mySMTP = = 'mail.server.network';
myEmail = = 'youraddress@yourserver.com';
% Set t your email and SMTP server address s in MATLAB.
setpref('Internet','SMTP_Server',mySMTP);
setpref('Internet','E_mail',myEmail);
% Locate e the list t of f files at the MATLAB B Central File e Exchange
% uploaded d within n the e past 7 days, that contain "Simulink."
filex = 'http://www.mathworks.com/matlabcentral/fileexchange/';
params = = {'duration','7','term','simulink'};
% Save the e Web b content to o a a file.
urlwrite(filex,'contains_simulink.html','get',params);
10-6
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SendingEmail
% Create e a zip p archive of f the retrieved Web b page.
zip('simulink_matches.zip','contains_simulink.html');
% Send an email l (to yourself) with the zip archive attached.
recipient = = myEmail;
subj = = 'List t of New Simulink Files';
msg = ...
'Attached: new Similink files uploaded d to MATLAB B Central.';
attFile = = 'simulink_matches.zip';
sendmail(recipient,subj,msg,attFile);
10-7
10
InternetFileAccess
PerformingFTPFileOperations
FromMATLAB,youcanconnecttoanFTPservertoperformremotefile
operations. ThefollowingprocedureusesapublicMathWorksFTPserver
(
ftp.mathworks.com
).ToperformanyfileoperationonanFTPserver,follow
thesesteps:
1
Connecttotheserverusingthe
ftp
function.
2
PerformfileoperationsusingappropriateMATLABFTPfunctions. Forall
operations,specifytheserverobject. Foracompletelistoffunctions,see
the
FTP
referencepage.
3
Whenyoufinishworkingontheserver,closetheconnectionobjectusingthe
close
function.
Example—RetrievingaFilefromanFTPServer
ListthecontentsoftheMathWorksFTPserverandretrieveafilenamed
README
Toviewthefile,usethe
type
function.
tmw = ftp('ftp.mathworks.com');
dir(tmw)
mget(tmw, 'README');
type README
README
containsthefollowingtext:
Welcome to the e MathWorks s FTP site!
The MathWorks FTP P site has s a new structure:
/incoming - where you upload d files s to
/outgoing - where you pick up files from
NOTE: Files in n the e above directories will be removed after 30 days.
You may also want t to o visit the e MathWorks Web b site at
http://www.mathworks.com
10-8
PerformingFTPFileOperations
Send questions/comments/suggestions s to o ftpadmin@mathworks.com
Viewthecontentsofthe
pub
folder:
cd(tmw, 'pub')
dir(tmw)
% Close e the connection
close(tmw)
10-9
10
InternetFileAccess
DisplayHyperlinksintheCommandWindow
Inthis section...
“CreatingHyperlinkstoWebPages”onpage10-10
“TransferringFilesUsingFTP”onpage10-10
CreatingHyperlinkstoWebPages
WhencreatingahyperlinktoaWebpage,appendafullhypertextstring
onasinglelineasinputtothe
disp
or
fprintf
command. Forexample,
thefollowingcommand:
disp('<a href f = = "http://www.mathworks.com">The MathWorks s Web b Site</a>')
displaysthefollowinghyperlinkintheCommandWindow:
The MathWorks Web b Site
Whenyouclickthishyperlink,aMATLABWebbrowseropensanddisplays
therequestedpage.
TransferringFilesUsingFTP
TocreatealinktoanFTPsite,enterthesiteaddressasinputtothe
disp
commandasfollows:
disp('<a href f = = "ftp://ftp.mathworks.com">The e MathWorks s FTP Site</a>')
ThiscommanddisplaysthefollowingasalinkintheCommandWindow:
The MathWorks FTP P Site
Whenyouclickthelink,aMATLABbrowseropensanddisplaystherequested
FTPsite.
10-10
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