the documentation doesn't say if I can instantiate those classes, or does it?if I could understand via GIRepository.Repository if a class could be extended/instantiated I could improve cgjs-about to show that right away.So far I thought that `objects` where all usable as `new Class` but that's not the case at all. Maybe I should check for an `is_abstract_object` ?Not sure there is anything like that though.Thanks.On Wed, Nov 8, 2017 at 3:41 AM, <philip chimento gmail com> wrote:This comes a bit too late to help you, sorry, but the C docs will tell you which classes extend a base class, e.g. for GInputStream (Gio.InputStream in GJS): https://developer.gnome.org/gio/stable/GInputStream.ht ml#GInputStream.object-hierarc hy On Tue, Nov 7, 2017 at 2:36 PM Andrea Giammarchi <andrea giammarchi gmail com> wrote:so, just FYI ...Buffered, Converter, Data, File, Memory and Unix InputStream are available.Buffered, Converter, and Data need a base_stream to work ... not a primitive.File and Unix need attributes or fd pointersThe Memory seems to be the "base/primitive" I was looking for together with its MemoryOutputStream counterpart.Regards______________________________On Tue, Nov 7, 2017 at 7:28 PM, Andrea Giammarchi <andrea giammarchi gmail com> wrote:oh gosh, my own utility ... that is less useful in pretty print for these kind of things .... although the list has many non-usable streams but now I want to know which one is usable.P.S. for namespaces you don't' need gi prefix ... cgjs-about Gio would do the same ;-)Thanks againOn Tue, Nov 7, 2017 at 7:09 PM, Sam Jansen <sam jansen starleaf com> wrote:On 7 November 2017 at 21:55, Andrea Giammarchi <andrea giammarchi gmail com> wrote:this is gold, thank you!!!do you know if MemoryInputStream is the only one usable? is there any list of available GJS streams one can use? I think memory is just fine though, thanks again a lot!I just took an educated guess: I figured anything useful would extend Gio.InputStream. I then just browsed through the docs, looking for anything with "InputStream" in their name, which isn't so many...This is a good place to start perhaps:$ cgjs-about gi.Gio --json | grep InputStream | grep -Ev "Class|Private"It would be a neat extension to cgjs-about if one could have it list the classes known to implement an interface or extend from a class...On Tue, Nov 7, 2017 at 6:46 PM, Sam Jansen <sam jansen starleaf com> wrote:Hi Andrea,I've come up with something that... almost does what you're looking at here. Perhaps it's useful as a guide of what one can do with the Gio interface.I think you may hit some awkward problems with modelling Node-style streams with GLib ones. But perhaps it is possible and this helps. I don't really know the Node stream semantics so I have assumed various things in my Readable implementation as you'll see... Note that MemoryInputStream really is just a byte stream; so there is no guarantee you'll receive the exact block of bytes that was written -- for example, when I run this I get a first chunk of "12", followed by "3", "4", etc.let Gio = imports.gi.Gio;let byteArray = imports.byteArray;let mainloop = imports.mainloop;class Readable {constructor() {this._mio = Gio.MemoryInputStream.new();this._callbacks = {};this._startNext();}_startNext() {// Enqueue an async read; and re-enqueue when it finishes, so we're// always waiting for data...this._mio.read_bytes_async(4096, 1, null, (source, res) => { this._onData(this._mio.read_bytes_finish(res)); this._startNext();});}_onData(bytes) {if (this._callbacks['data']) {let ba = byteArray.fromGBytes(bytes);this._callbacks['data'](ba);this._read();}}push(bytes) {if (bytes == null) {mainloop.quit('main');return;}this._mio.add_bytes(bytes);}on(name, callback) {this._callbacks[name] = callback;if (name === 'data') {this._read();}}}class Counter extends Readable {constructor(opt) {super(opt);this._max = 1000;this._index = 1;}_read() {const i = this._index++;if (i > this._max)this.push(null);else {const str = '' + i;const buf = byteArray.fromString(str); // Buffer.from(str, 'ascii');this.push(buf);}}}(new Counter).on('data', (str) => {print("data", str.toString());});mainloop.run('main');On 7 November 2017 at 10:08, Andrea Giammarchi <andrea giammarchi gmail com> wrote:______________________________I am trying to implement a stream module and apparently I have everything I need but practically I'm unable to use streams.If I instantiate a `new Gio.InputStream` I have the following error:cannot create instance of abstract (non-instantiatable) type 'GInputStream'I cannot even extend it ... so I've though "ok, maybe it's like an interface, I implement it and that's it"But then a JS class wouldn't work as base_stream for a Gio.BufferedInputStream, and if I extend the JS class to be a GObject.Object then:Gjs-WARNING **: JS ERROR: TypeError: Object is of type GObject.Object - cannot convert to GInputStreamwhere GInputStream is the one I cannot use in the first place.I've reached full circle then so ... I wonder if anyone has any idea how to use/create/extend streams in GJS (not talking about file streams but streams in general) or if it's even possible.In node, as example, I could do this and it will work:```jsconst { Readable } = require('stream');class Counter extends Readable {constructor(opt) {super(opt);this._max = 1000;this._index = 1;}_read() {const i = this._index++;if (i > this._max)this.push(null);else {const str = '' + i;const buf = Buffer.from(str, 'ascii');this.push(buf);}}}(new Counter).on('data', console.log);```_________________
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