At 21:54 12/09/2004 +0200, Klaus Major wrote:
Hi rand,
Hi, all. I really appreciate the feedback you guys gave me on my ftp problem -- I was trying to download a series of files and I needed to know how to use the libURLDownloadToFile command properly. My problem was that files weren't downloading proprerly, and I figured it was because I was using a "blocking" strategy with a looping "put" command. But I continue to have problems and I'm hoping someone can give me a clue. Here's the problem:
Following similar suggestions from Sarah Reichelt and Andre Garzia, I created special handlers that use the libURLDownloadToFile command, like so:
libURLDownloadToFile tFileOnWebtoGet,tFileNameOfDownloadedFile,"downloadDone"
Then I have a handler
on downloadDone -- end downloadDone
which checks to see if the download queue is empty, and if so, quits. The problem is that on downloadDone never seems to get called.
Please make sure that BOTH handlers, the one that calls the "libURLDownloadToFile"
AND "DownloadDone" are in the SAME script!
I'm bothered when you say "checks to see if the download queue is empty, and if so, quits".
The downloadDone handler will be called when each file has completed downloading (i.e. once per call to libURLDownloadToFile, so it needs to exit each time.
There must be an error in downloading the first file, which has the correct name in the local directory, but is empty.
well, there is a stunning array of potential problems, i am realizing. but when i do a test for an error message on download, i get:
"error, url is currently loading"
what is this about, since the handler that called that url should be long done? is there a way to wipe the ftp slate clean?
libURLResetAll should do it.
Here's a snippet of code that downloads and displays photos; the photos are downloaded into a local disk-based cache, and displayed from there; the rest of the code is downright confusing, so this is just the business part of it ....
btw - I have very high expectation that these transfers will succeed, because the photo names are generated automatically, so it's very unlikely there will be failures, therefore there's not as much error checking as would normally be desirable.
This comes at the very end of the handler "display_photo"
put "d:/filecache/"&thisPhotoName into cacheName libURLSetStatusCallback "downloadStatus", the long ID of me libURLDownloadToFile fname, cacheName, "downloadComplete"
end display_photo
on downloadComplete
get the URLStatus of remoteName
if it <> "downloaded" then
set the visible of field "MyField" to true
put "download status is" && it && "for" && remoteName && "into" && thisPhotoName & cr after msg
end if
set the visible of field "MyField" to false
put URL ("binfile:d:/filecache/"&thisPhotoName) into image "MyImage"
put empty into thisPhotoName
go stack "Photo Viewer Window"
end downloadComplete
on downloadStatus
get the URLStatus of remoteName
if it <> "downloaded" then
set the visible of field "MyField" to true
put "Downloading:" && thisPhotoName && the URLStatus of remoteName into field "MyField"
end if
end downloadStatus
hope this helps, -- Alex Tweedly.
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