It looks like you are using nsIDNSService correctly, but I don't see how
you are hooking this code up to the rest of Firefox. You said that you
based your code on nsSample.js, but I don't see the code here that
handles XPCOM component registration. Feel free to attach a complete
example, and I'll help debug.
-Darin
Ludovic LANGE wrote:
Hello,
Forgive me if it's not the right place to ask. I am trying to use the
dns-service from an extension (XPI), and while the 'resolve' method is
working as it should, using the 'asyncResolve' leads to FireFox hanging.
The code I'm using in my javascript file is at the end of the message,
slightly edited, and so is the output of the console. FireFox seems to
hang right after exiting the see_main() function.
I'm using FireFox v1.0PR under Windows.
I have no experience in writing listener (XPCom components in
Javascript) and most of my inspiration comes from
lxr.mozilla.org/seamonkey/source/xpcom/sample/nsSample.js concerning
the 'listener' variable.
However, I don't know if I must 'register' this new component to
XPCom, or if passing the variable 'listener' to the asyncResolve
procedure is enough.
If there is nothing obviously wrong with this code, can you point me
towards any ressource that could help me going forward on this subject ?
Regards,
Ludovic LANGE.
Javascript
========================================================
var DNS = null;
function see_DNS() {
if( !DNS ) {
var clazz =
Components.classes['@mozilla.org/network/dns-service;1'];
var iface = Components.interfaces.nsIDNSService;
DNS = clazz.getService(iface);
//DNS.init();
}
return DNS;
}
var listener =
{
QueryInterface : function(aIID)
/* {00000000-0000-0000-c000-000000000046} */
{
dump("myListener: QueryInterface(" + aIID + ")\n");
if (aIID.equals(Components.interfaces.nsIDNSListener) ||
aIID.equals(Components.interfaces.nsISupports) ) {
dump("myListener: QueryInterface : ok\n");
return this;
}
throw Components.results.NS_NOINTERFACE;
Components.returnCode = Components.results.NS_ERROR_NO_INTERFACE;
return null;
},
onLookupComplete: function( aRequest, aRecord, aStatus )
{
dump("myListener: onLookupComplete(" + aRequest + ", " +
aRecord + ", " + aStatus +")\n");
if( this._thumb && aStatus ) {
var sIp = aRecord.getNextAddrAsString();
if( sIp ) {
dump("myListener: onLookupComplete() sIp = " + sIp +
"\n");
}
}
}
}
function sResolve(domain) {
dump("sResolve(" + domain + ")\n");
var dns = see_DNS();
if( dns ) {
var ip = null;
if( domain ) {
try {
ip = dns.resolve( domain, false ).getNextAddrAsString();
}
catch( ex ) {
dump("sResolve() Exception : " + domain + "\n");
}
if( ip ) {
dump("sResolve() Resolving '" + domain + "' as '" + ip
+ "'\n");
}
}
}
dump("sResolve() return\n");
return false;
}
function aResolve(domain) {
dump("aResolve(" + domain + ")\n");
var dns = see_DNS();
if( dns ) {
var ip = null;
if( domain ) {
try {
ip = dns.asyncResolve( domain, false, listener, null );
}
catch( ex ) {
dump("aResolve: Exception : " + href + "\n");
}
}
}
dump("aResolve() return\n");
return false;
}
see_main() {
dump("see_main()\n");
dump("begin\n");
sResolve("yahoo.co.uk");
aResolve("yahoo.com");
dump("see_main() return\n");
}
window.addEventListener("load",function() {see_main();} ,true);
========================================================
Console
========================================================
see_main()
begin
sResolve(yahoo.co.uk)
sResolve() Resolving 'yahoo.co.uk' as '217.12.3.11'
sResolve() return
aResolve(yahoo.com)
myListener: QueryInterface({00000000-0000-0000-c000-000000000046})
myListener: QueryInterface : ok
aResolve() return
see_main() return
========================================================
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