2nd pass . . .
getInterfaceByProgID returns an array of interfaces that the service
implements.
js> getInterfaceByProgID('@mozilla.org/network/io-service;1');
nsIIOService
js> getInterfaceByProgID('@mozilla.org/image/decoder;2?type=image/jpeg');
nsIOutputStream,imgIDecoder
js> getInterfaceByProgID('@mozilla.org/network/stream-io-channel;1');
nsIChannel,nsIInterfaceRequestor,nsIStreamProvider,nsIRequest,nsIStreamIOChannel,nsIRequestObserver,nsIStreamListener,nsIProgressEventSink
js> getInterfaceByProgID('@mozilla.org/network/file-transport-service;1');
nsIFileTransportService
js> getInterfaceByProgID('@mozilla.org/thread;1');
nsIThread
js> getInterfaceByProgID('@mozilla.org/document-charset-info;1');
nsIDocumentCharsetInfo
js> getInterfaceByProgID('@mozilla.org/file/local;1');
nsILocalFile,nsIFile
js> getInterfaceByProgID('eat me');
null
/*****************************************************/
function getInterfaceByProgID(aProgID)
{
var C = Components;
var iface = C.interfaces;
var c = C.classes;
var res = new Array();
var list;
var inst;
if(!aProgID)
{
throw C.results.NS_ERROR_XPC_NOT_ENOUGH_ARGS;
return null;
}
if(typeof(c[aProgID])=='undefined')
return null;
inst=c[aProgID].getService();
for(list in iface)
{
try
{
if(typeof(iface[list])!='undefined')
if(typeof(inst.QueryInterface(iface[list]))=='object' &&
list!='nsISupports')
res.push(list);
}
catch(e){}
}
return (res !="" ? res : null);
}
/*****************************************************/
