The specific example you try is a client that connects to a webserver to
fetch the image. If you have no webserver running (no valid url...): no
image!
async:// is just like tcp:// , but now with calllbacks instead of
waiting yourself. Does this help you?
--Maarten
Coussement Christophe wrote:
> Hi Maarten and Will
>
> Sorry for this late answer: I was out of office for a while...
> Thanks for helping me !
>
>
>>>I tried the following, but without any result. I try to load
>>
>>a %logo.jpg file situated in the same dir as %async-protocol,
>>and try to connect to localhost. What did I wrong?
>>
>>What are you trying to do? Fetch the file from a file or a webserver?
>
>
> Fetch from the file.
> I just wanted to try the code running on localhost.
>
>
>>>;>>>>>>>>>>>>>>>>>>> code ---
>>>do %async-protocol.r
>>>
>>>handler: func [
>>> { your comment here
>>> RETURN: }
>>> port [port!] "comment"
>>> state [word! error!]
>>> /local tmp cmd
>>>][
>>> ;$debug/var/stop 'state
>>> if error? :state [print mold disarm state return true]
>>> switch state [
>>> connect [
>>> insert port {GET logo.jpg
>>
>>HTTP/1.0^M^JHost:127.0.0.1^M^J^M^J}
>>
>>> false
>>> ]
>>> read [false]
>>> write [false]
>>> close [
>>> data: copy port
>>> close port
>>> ;$debug/var/stop 'data
>>> data: to binary! find/tail data "^M^J^M^J"
>>>
>>>
>>
>>Do you receive data? What does your webserver log say?
>
>
> Well, do I have to work on a webserver?
> I thought %async-protocol.r serviced a sort of server, listening on specified port ?
>
>
>>> other/image: attempt [load data]
>>> other/text: ""
>>> show other
>>> false
>>> ]
>>> ]
>>>]
>>>
>>>port: open async://127.0.0.1:80
>>>port/awake: :handler
>>>
>>>view layout [
>>> across me: box 100x100 random 255.255.255 0:00:0.5 feel [
>>> engage: func [f a e][
>>> if a = 'time [
>>> me/color: random 255.255.255
>>> show me
>>> ]
>>> ]
>>> ]
>>> other: box 100x100 255.255.255 "Downloading image ..." return
>>> area 208x100 "you can type here while downloading"
>>>]
>>>;--- code <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>>>
>>>
>>
>>It looks like you are re-using the exact code I mailed, which (I just
>>checked) works. So it looks like you'll have to debug using your
>>webserver and debugger in the script to see what gets done and what
>>doesn't. Sorry I can't help any more, but the code looks fine
>>(an exact
>>copy of the sample code except for the URI).
>>
>
>
> anyway, wet i get is the generated window, but with no image loading.
> After placing a debug mark at the beginning of 'handler, I can see the function
> isn't evaluated once.
> I think I'm confused about the context of the use of this protocol :(
> Could you provide me with a concrete use case ?
>
> TIA
>
> ==christophe
>
>
>
>
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