> How to preload members in background mode?
Here's the quick'n'dirty explanation, then I'm going to refer you to the docs and some
tech notes:
1. Initiate the preloadNetThing() process
tFoo = preloadNetThing(someUrl)
Use the above to start the download process; someUrl is the URL of the file you want
to download to the user's cache and tFoo will now be an integer that is the download's
ID number which will be used in the steps below.
2. Monitor the download progress
tDone = netDone(tFoo)
The above will return a boolean, TRUE if the download is completed, FALSE if it's in
progress. When it returns true go to step 3. Notice that I used tFoo in the call to
netDone(), I'm asking for the netDone() status of that particular stream, you can have
multiple downloads in progress at one time.
3. When download is done, check it for errors
tError = netError(tFoo)
If the above returns "OK" then your download has completed and is error free, if it
does not return "OK" then it will return a number which you can use to determine the
failure that occurred.
It is important to note that you _must_not_ wait in a repeat loop for this to
complete, network operations will not update their status while you sit in a repeat
loop. Therefore it is recommended that you use frame events to monitor the download
and its status. For example, here is a frame script that sits on the frame until a
file is downloaded:
property pNetID
on beginSprite
pNetID = preloadNetThing(someURL)
end
on exitFrame
if (netDone(pNetID) = TRUE) then
if (netError(pNetID) = "OK") then
go to the frame + 1
else
-- insert your own error handling here
end if
else
go to the frame
end if
end
You might also consider looking into the getStreamStatus() function as it will tell
you how many bytes have been retrieved and how much there is total (progress bar!) if
your server is configured correctly (to deliver header info IIRC). For future
reference there are many tech notes to be found in the Macromedia Director Support
Center, specifically these documents:
Director- preloadNetThing Show Me
<http://www.macromedia.com/support/director/how/show/preldnetthing.html>
How do I use preLoadNetThing?
<http://www.macromedia.com/support/director/ts/documents/sample_preloadnetthing.htm>
What does preloadNetThing look like in action?
<http://www.macromedia.com/support/director/ts/documents/preloadnetthing.htm>
Note: all three of the above were found by going to the Support Center
(<http://www.macromedia.com/support/director>) and searching using the term
'preloadNetThing'. Hope that helps, good luck!
Cheers,
Tom Higgins
Product Specialist - Director Team
Macromedia
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