Re: FTP Sessions

[Darin Fisher]

mawrya wrote:

Darin Fisher wrote:

there's some sample code here:

http://lxr.mozilla.org/mozilla/source/netwerk/test/TestProtocols.cpp

which shows you how to load any URL using necko (mozilla's networking 
library).  for FTP upload, check out this sample code:

http://lxr.mozilla.org/mozilla/source/netwerk/test/TestUpload.cpp

again, this sample code is not particular to FTP and will work just 
as well with HTTP PUT.

...[snip]...

and, of course feel free to ask questions! :)

darin

Thanks for the speedy reply!  I do have a couple of other questions:

1.  Can this all be done in Javascript alone?  I would like to make a 
javascript prototype (class) for an FTP session that has a 
method/function that allows you to pass a FTP URL to as well as 
USERNAME/PASSWORD and a  DOM object for upload to a FTP server.  I can 
serialize the DOM to a string or whatever if neccessary.  Is creating 
something like this viable in Javascript?  My C programming skills are 
just not there yet but Javascript I can write in my sleep.

2.  I am a little confused about all the components that go into 
establishing an FTP session and uploading a file.  I have looked 
through all the links you listed and am going through the XPCOM 
Network interface documentation at xulplanet.com.  Things are slowly 
making sense but what is the sequence of steps?  i.e.  A) create a 
(FTP)Channel using the IOService, B)Create a URI instance and somehow 
plug it into the channel... I'm lost.

I really just want a function I can access from Javascript, as 
mentioned above, that I can use to upload a simple xml text file, and 
possibly binary also.  Am I out to lunch?  I figure if its being done 
Mozilla Composer it must be possible!  I would also like to submit the 
finished product to the mozdev JSLib project for other developers 
future use.

any help is most appreciated - mawrya

something like this might do the trick:  (note: i have not tested this 
at all.)

function MyListener() {} // constructor

MyListener.prototype = {
 QueryInterface: function(iid)
 {
   if (!iid.equals(Components.interfaces.nsISupports) &&
       !iid.equals(Components.interfaces.nsIRequestObserver) &&
       !iid.equals(Components.interfaces.nsIStreamListener))
       throw Components.results.NS_ERROR_NO_INTERFACE;
   return this;
 },
 onStartRequest: function(aRequest, aContext)
 {
   // aRequest is your channel... this callback indicates that the 
upload is starting
 },
 onDataAvailable: function(aRequest, aContext, aInputStream, aOffset, 
aCount)
 {
   // for uploads, this function should not be called
 },
 onStopRequest: function(aRequest, aContext, aStatus)
 {
   // aRequest is your channel... this callback indicates that the 
upload has completed.
   // it completed successfully if aStatus == 0
 }
};

var myStream = Components.classes["@mozilla.org/io/string-input-stream;1"]
                        
.createInstance(Components.interfaces.nsIStringInputStream);
myStream.setData(myData, numberOfBytes);

var ios = Components.classes["@mozilla.org/network/io-service;1"]
                   .getService(Components.interfaces.nsIIOService);
var channel = ios.newChannel("ftp://[EMAIL PROTECTED]:host/incoming/foo.xml", 
null, null);
var uploadChannel = 
channel.QueryInterface(Components.interfaces.nsIUploadChannel);
uploadChannel.setUploadStream(myStream, "", -1);
channel.asyncOpen(new MyListener(), null);

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