On Tue, 19 Dec 2000, Bert Freudenberg wrote:

> On Tue, 19 Dec 2000 Torsten.Bergmann at phaidros.com wrote:
> 
> > >Another slight correction - ProjectViewMorph does all that for you. So the
> > >loader script merely becomes this:
> > >
> > >  ProjectViewMorph
> > >    openFromFile: (FileStream requestURLStream: 'mySqueaklet.extSeg')
> > 
> > But:
> > 
> > #openFromFile sends the message #asUnZippedStream to the given string
> > and this method is not implemented for Strings in the plugin image
> > I've found at:
> > (http://wwwisg.cs.uni-magdeburg.de/~bert/squeak/plugin/download.html#win)
> 
> I just double-checked. The SqueakPlugin.image contained in
> http://wwwisg.cs.uni-magdeburg.de/~bert/squeak/plugin/npsqueak-noarch.zip
> does have that method, implemented by ReadWriteStream.

Oh, you wrote "not implemented for Strings" - can you tell what String
this was sent? That's odd.

Actually, requestURLStream: should return nil when an error occured. So it
would be wise to check the stream first:

| url stream |
url _ 'mySqueaklet.extSeg'.
stream _ FileStream requestURLStream: url
        ifError: [^ PopUpMenu notify: 'Not in a  browser?'].
stream ifNil: [^ PopUpMenu notify: 'Error downloading ', url].
ProjectViewMorph openFromFile: url

Apropos requested URLStreams: Keep in mind these actually are files
located in the browser's cache directory, which is outside the Squeak
Plugin's file sand box. It's thus not possible to close and reopen the
file. Anything involving Stream>>reset will fail, because this is (for no
good reason, IMNSHO) implemented as #reopen. 

On a related note, it's best to treat these as pipes rather than files
(that means no seeking allowed etc.) because in future Squeak Plugin
versions most certainly the current mechanism will be extended to actually
stream the data into Squeak as it arrives from the browser. Currently, the
whole file is downloaded first, and then handed over to Squeak.

-- Bert