Download a file with Adobe AIR

apache-flex actionscript air
AlexH picture AlexH · Dec 5, 2008 · Viewed 23.8k times · Source

How do I download a file from the internet in a Flex based AIR application.

I tried using a file with url set to the address, but I got a file does not exist error when I tried to save it. And it is really hard to google for help on this issue.

Answer

seanalltogether picture seanalltogether · Dec 6, 2008

You want to choose from 2 api combos to accomplish this.

Version 1 is URLLoader and FileStream

Using this combination of class, you would load the file from your server in to air via the URLLoader object. This will download the file in to memory and then notify you when the download is complete. Make sure you initiate the download with a dataFormat of URLLoaderDataFormat.BINARY. You would then initiate a Filestream object and write it out to the disk using writeBytes().

Version 2 is URLStream and FileStream

URLStream is very similar to URLLoader, but instead of waiting for the file to completely download before using the result, data is made available to you during the download. This method works well for large files because you don't have to wait for the full download to start saving it to disk, and you also save on memory since once the player hands it off to you it can release the memory related to that data. YOu would use filestream in exactly the same way, you would just end up doing a writeBytes() on each chunk of the file as it streams in.

Related questions

How to pass "Null" (a real surname!) to a SOAP web service in ActionScript 3

We have an employee whose surname is Null. Our employee lookup application is killed when that last name is used as the search term (which happens to be quite often now). The error received (thanks Fiddler!) is: <soapenv:Fault&…

Read More
What is the best way to get the minimum or maximum value from an Array of numbers?

Let's say I have an Array of numbers: [2,3,3,4,2,2,5,6,7,2] What is the best way to find the minimum or maximum value in that Array? Right now, to get the maximum, I am looping through the Array, and resetting a variable to …

Read More
How to deal with Number precision in Actionscript?

I have BigDecimal objects serialized with BlazeDS to Actionscript. Once they hit Actionscript as Number objects, they have values like: 140475.32 turns into 140475.31999999999998 How do I deal with this? The problem is that if I use a NumberFormatter with precision of 2, …

Read More