如何实现拍照预览onPreviewFrame回调

import { BusinessError } from '@ohos.base'; 
 
function onImageArrival(receiver: image.ImageReceiver): void { 
  receiver.on('imageArrival', () => { 
    receiver.readNextImage((err: BusinessError, nextImage: image.Image) => { 
      if (err || nextImage === undefined) { 
        console.error('readNextImage failed'); 
        return; 
      } 
      nextImage.getComponent(image.ComponentType.JPEG, (err: BusinessError, imgComponent: image.Component) => { 
        if (err || imgComponent === undefined) { 
          console.error('getComponent failed'); 
        } 
        if (imgComponent && imgComponent.byteBuffer as ArrayBuffer) { 
          // do something... 
        } else { 
          console.error('byteBuffer is null'); 
        } 
        nextImage.release(); 
      }) 
    }) 
  }) 
}
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