ReadPacket

BOOL CNdisApi::ReadPacket (PETH_REQUEST pPacket);

Return Value:
TRUE if call was successful, FALSE otherwise

Parameters:
pPacket
Pointer to the user allocated and initialized ETH_REQUEST structure.

Remarks:
For this call the following fields of ETH_REQUEST must be initialized:

  • ETH_REQUEST::hAdapterHandle must be set to the interface handle (obtained via call to CNdisApi::GetTcpipBoundAdaptersInfo). The packet will be extracted from the network interface associated packet queue. Remember that packets queued only when network interface in the filtering of listening mode.
  • ETH_REQUEST::EthPacket.Buffer must point to the user allocated INTERMEDIATE_BUFFER structure

The following fields of the INTERMEDIATE_BUFFER are initialized by helper driver in case of success:

  • INTERMEDIATE_BUFFER::m_IBuffer contains Ethernet packet
  • INTERMEDIATE_BUFFER::m_Length contains the actual length of the packet
  • INTERMEDIATE_BUFFER::m_Flags is a combination of NDIS_FLAGS_XXX (defined in ndis.h). These flags are copied from the NDIS_PACKET.Private.Flags.
  • INTERMEDIATE_BUFFER::m_dwDeviceFlags is PACKET_FLAG_ON_SEND if packet goes from MSTCP to network interface or PACKET_FLAG_ON_RECEIVE otherwise.

This member calls driver with IOCTL_NDISRD_READ_PACKET control code (see details below).

IOCTL_NDISRD_READ_PACKET

Input Buffer _ETH_REQUEST
Input Buffer Size sizeof (_ETH_REQUEST)
Output Buffer _ETH_REQUEST
Output Buffer Size sizeof (_ETH_REQUEST)