Fired before a transfer begins.
Object_OnPreTransfer()
This is the place to read the properties of image information: ImageBitsPerPixel property, ImagePixelType property, ImageLength property, ImageWidth property, ImageXResolution property, ImageYResolution property, ImageLayoutDocumentNumber property, ImageLayoutFrameLeft property, ImageLayoutFrameTop property, ImageLayoutFrameRight property, ImageLayoutFrameBottom property, ImageLayoutPageNumber property, ImageLayoutFrameNumber property.
This is also the place to call CancelAllPendingTransfers().
OnPreAllTransfers Event, OnPostAllTransfers Event, OnPostTransfer Event, OnTransferCancelled Event, OnTransferError Event.