ProcessFrameDelegate Interface Reference

Public Member Functions

void DidCaptureImage (BarcodePicker barcodePicker, CMSampleBuffer frame, IScanSession session)

Detailed Description

Protocol for accessing the processed sample buffers.


Member Function Documentation

void DidCaptureImage ( BarcodePicker  barcodePicker,
CMSampleBuffer  frame,
IScanSession  session 

Method invoked whenever a frame has been processed by the barcode scanner.

This method is called on the ProcessFrameDelegate whenever the barcode scanner has finished processing a frame.

barcodePickerthe barcode picker instance that processed the frame
framethe sample buffer containing the actual frame data.
sessionThe current scan session containing the state of the recognition process, e.g. list of codes recognized in the last processed frame. The scan session can only be accessed from within this method. It is however possible to use codes returned by ScanSession.NewlyRecognizedCodes outside this method.

This method is invoked from a picker-internal dispatch queue. To perform UI work, you must dispatch to the main queue first. When new codes have been recognized, this method is invoked after ScanDelegate::barcodePicker:didScan is called on the BarcodePicker::scanDelegate.

You must call Dispose on the frame when you are done using it, e.g. typically before returning from this delegate method. The system has a limited pool of video frames, and once it runs out of those buffers, the system will stop calling this method until the buffers are released.