INativeListener.OnGetFrameLength Method

Native (C++):

HRESULT OnGetFrameLength ( _FILETIME * fTime,void * pData,unsigned long Size,unsigned long FrameLength,unsigned long FrameNumber) ;

Parameters

fTime The time of the event. pData Pointer to a USBPACKET. Use it to manually parse all fields. See MFCSample for more details. Size Total size of USBPACKET and all payload data. Equals to nSize variable:

C++

          USBPACKET packet;
          ULONG nSize = packet->Size;

          USBPACKET_URB* pUrb = (USBPACKET_URB*)packet;
          ATLASSERT(pUrb->Size==nSize);

FrameLength Contains the length of each bus frame in USB-defined bit times. FrameNumber Contains the earliest bus frame number that the frame length can be altered on return from the host controller driver.

Return Value

S_OK or standard OLE error code.

Remarks

Fired when URB packet with urb.UrbHeader.Function=URB_FUNCTION_GET_FRAME_LENGTH is received. See _URB_GET_FRAME_LENGTH for more details. The library decodes several parameters from this packet (see above).

< PreviousTopNext >