Need help with Error #2044: Unhandled securityError:.

Question

Hi,
I am developing an AIR+AJAX app and I am using sockets to connect to the ftp server and just checking whether the app is able to connect to the ftp server successfully, check the user name and password and return with a message.
It connects and displays the following error after 15 seconds or so:
Error #2044: Unhandled securityError:. text=Error #2048: Security sandbox violation: app:/index.html cannot load data from www.mydomain.in:21.
at flash.html::HTMLLoader/nativeOnMouseUp()
at flash.html::HTMLLoader/invokeMouseUpImpl()
at flash.html::HTMLLoader/onLeftMouseUp()
How can I take care of this? The app needs to connect to the ftp server often. This error is shown when I am in preview mode.
This is absolutely essential for me to take care of this because the app will check any number of domains and connect using sockets. Is there anyway to suppress these errors. I have heard of air.Security but how exactly should I use in this regard.
Please help.
Gaurav

Answer 1

Hi Gaurav,
I'm not sure exactly what kind of documentation you are looking for.
The live docs language reference pages have sections for Events and Error for each API. You can see there what events or errors a class or any given function may dispatch, and treat them accordingly.
(http://help.adobe.com/en_US/AS3LCR/Flash_10.0/index.html)
Here is a resource on error events for ActionScript:
http://livedocs.adobe.com/flex/3/html/help.html?content=11_Handling_errors_10.html
I don't know if you're aware of this, but even if an AS3 API does not have an alias in AIRAliases, it can still be accessed via the runtime property:
runtime.<package-name>.<class/function> (ex. runtime.flash.events.ErrorEvent)
You might want to also have a look at this book:
http://onair.adobe.com/files/AIRforJSDevPocketGuide.pdf
See the Troubleshooting AIR Applications section (and the "Missing event listeners for error events" subsection)
Regarding the file upload.
I think the FileStream is the API you are looking for.
The live docs for FileStream should have pretty good examples on reading from a file. I think the 'readBytes' function is the one you should be looking at.
The above book contains a File API section - you can look at "Asynchronously Read Text from a File" for a streamlined file reading process.
You will probably want to read binary files, but the process is similar. Subsitute the 'readMultiByte' function, which returns a string, with the 'readBytes' function, which reads binary data into a ByteArray.
You will then write the data read into the byte array to the socket.
Also, there is a sample on Adobe Labs called KeePIPE, demonstrating the use of new networking APIs in AIR 2. It might be too complicated, and not map exactly to what you're looking for, but you can have a look at:
js/SendChannel.js : App.SendChannel.prototype.sendFile function.
Source Code: http://download.macromedia.com/pub/labs/air/2/b2/samples/keepipe.zip
Samples Page: http://labs.wip3.adobe.com/technologies/air2/samples/
Hope this helps.
Horia