How to access scanner device using wifi in iphone application (same as wifi printer)?

I want to access scanner device in my iphone app via wifi just like printer (as we do for UIPrinterInteractionController)

there are already several apps available on itunes like 开发者_如何转开发iPrint&Scan etc.

Please help me out, I get stuck on this.

thanks, Mrunal

use UISupportedExternalAccessoryProtocols

check this one http://developer.apple.com/library/mac/#samplecode/SampleScannerApp/Listings/Controller_h.html#//apple_ref/doc/uid/DTS40007644-Controller_h-DontLinkElementID_3

check External accessory framework it will be useful