我试过
http://rebol.wik.is/Protocols/Test-async-http.r
do %async-protocol.r
do %async-http.r
buffer: copy ""
content-length: 0
handler: func [port [port!] event [error! word!]
] [
switch event [
connect [print "Connected." false]
read [
if port/sub-port/state/inbuffer [
statustxt/text: form length? port/sub-port/state/inbuffer
show statustxt
if zero? content-length [
either parse/all port/sub-port/state/inbuffer [ thru "content-length: " copy content-length to newline to end ][
if content-length [
content-length: to-integer trim/all content-length
]
][ content-length: none ]
]
if all [ content-length content-length > 0 ][
prog/data: ( to-integer statustxt/text ) / content-length
show prog
]
]
false
]
write [false]
close [print "Peer closed connection." append buffer copy port
close port
write/binary last split-path to-url urlfld/text buffer
false ; if you use true here, you'll exit the View event handler as well
]
]
]
do-download: has [url link ][
if not empty? url: urlfld/text [
if parse/all url [ "http" opt "s" "://" to end][
insert head url 'a
link: open to-url url
link/awake: :handler
]
]
]
view/new center-face layout [
across
label "URL: " gold urlfld: field 300 return
prog: progress 340x15 return
btn "Download" [ do-download ] return
label "You can type while downloading" black return
area 340x200 wrap
at 160x50 statustxt: text "bytes" 100 white
]
wait []
我收到了这个错误：
** Access Error: Invalid port spec: ahttp://reboltutorial.com
** Where: do-download
** Near: link: open to-url url
link/awake:
>>
该代码中是否存在错误？