Re: Fetching a web page

[Eric Plaster]

Brendan Eich wrote:

Eric Plaster wrote:

 
I was wondering if you could give my code a glance and let me know what I'm doing wrong or what I need to do.  Any help would be appreciated!  Thanks

/* Get a pointer to a service indicated by the ContractID, with given interface */
function getService(contractId, intf) {
    return Components.classes[contractId].getService(Components.interfaces[intf]);
}

function loadWebPage() {
  // **** Set this to a small, valid file
  var url = "http://www.talkware.net/";

  // convert to nsIURL interface.
  var url_ob = Components.classes["@mozilla.org/network/standard-url;1"]
    .createInstance()
    .QueryInterface(Components.interfaces.nsIURL);
  url_ob.spec = url;

  // Now open the URL.
  var ioService = getService('@mozilla.org/network/io-service;1',
            'nsIIOService');
  var atomService = getService('@mozilla.org/atom-service;1',
            'nsIAtomService');

  var channel = ioService.newChannelFromURI(url_ob)
    .QueryInterface(Components.interfaces.nsIHTTPChannel);

  channel.SetRequestMethod(atomService.getAtom('GET'));
  channel.SetRequestHeader(atomService.getAtom('content-type'), 'text/html');

  var inputStream = channel.openInputStream();
  // make the input stream scriptable.
  var sinputStream =
    Components.classes["@mozilla.org/scriptableinputstream;1"]
    .createInstance()
    .QueryInterface(Components.interfaces.nsIScriptableInputStream);
  sinputStream.init(inputStream);

  while(!sinputStream.available()) {
    dump("waiting....\n");
  }

So does your JS block here, waiting forever?

Yes.

 

Darin points out two ways around the lack of an event loop.  Did you try the second approach, setting nsIHTTPChannel::openInputStreamHasEventQueue?

Yes.  I put the following line in right after the "channel.SetRequestHeader" line:

channel.openInputStreamHasEventQueue = false;

With no effect.
 

 

Let's take this back to a newsgroup, maybe m.xpcom?  Cc'ing dougt and darin.

/be

 
  while(sinputStream.available()) {
    dump("Read '" + sinputStream.read(1024) + "'\n");
  }

  // close everything I know how!
  inputStream.close();
  sinputStream.close();
}
 

I would like to know how I would write my own event queque, but there is no real example is js that I could find.  I would like to keep my xpapp in js as much as possible.  Could someone just whip up a little snippet of code that pulls the contents of a web page so that I can see how it is done?

-thanks
 

-- 
----
Eric Plaster                    Universal Talkware Corp
Senior Software Engineer        (612)843-6711
[EMAIL PROTECTED]            http://www.talkware.net

 

S/MIME Cryptographic Signature