nsIUploadChannel and nsIFileChannel

[Matthew Buckett]

I'm trying to get some code that allows saving of some data (http/ftp/file URLs) and it works for nsIHttpChannel and nsIFtpChannel but nsIFileChannel doesn't seem to like it. I get no file created and an error of 0x8000ffff.

Here's the code:

var dataString = "This is a test string\n";

var ioService = Components.classes[
"@mozilla.org/network/io-service;1"
].getService(Components.interfaces.nsIIOService);

var nsIURI Components.classes[
"@mozilla.org/network/standard-url;1"
].createInstance(Components.interfaces.nsIURI);

nsIURI.spec = "file:///tmp/test.file";

var ioChannel = ioService.newChannelFromURI(nsIURI);
var destChannel = ioChannel.QueryInterface(
Components.interfaces.nsIFileChannel
);

var uploadChannel = destChannel.QueryInterface(
Components.interfaces.nsIUploadChannel
);

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

postStream.setData(dataString, dataString.length);
uploadChannel.setUploadStream(postStream, "text/plain", -1);

uploadChannel.asyncOpen(listener, null);


Thank you for any help.

Matthew Buckett