Retrieve the device type of the currently selected Data Source, it might be a scanner, a web camera, etc.
|Returned Values||Device Type|
|0||Failed, please check
|3||Flatbed, feeder, auto feed|
|4||Feeder-only scanner, auto feed|
|5||Flatbed, feeder, without auto feed|
|6||Feeder-only scanner, without auto feed|
Currently this method is only valid on Windows & Mac after you have called OpenSource on the selected device.