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NdisGetFirstBufferFromPacket

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This function returns pointers to the buffer descriptor and base virtual address for the initial buffer chained to a specified packet descriptor, along with the sizes of the initial buffer and total buffer in case the buffer is fragmented.

VOID NdisGetFirstBufferFromPacket(
IN PNDIS_PACKET _Packet, 
OUT PNDIS_BUFFER *_FirstBuffer,
OUT PVOID *_FirstBufferVA, 
OUT PUINT FirstBufferLength,
OUT PUINT _TotalBufferLength );

Parameters

  • Packet
    Pointer to the packet descriptor from which this function extracts information about the initial buffer.
  • FirstBuffer
    Pointer to a caller-supplied variable in which this function returns the address of the initial buffer descriptor chained to the specified packet descriptor.
  • FirstBufferVA
    Pointer to a caller-supplied variable in which this function returns the base virtual address of the initial buffer associated with the packet.
  • FirstBufferLength
    Pointer to a caller-supplied variable in which this function returns the number of bytes mapped by the initial buffer descriptor chained to the packet descriptor.
  • TotalBufferLength
    Pointer to a caller-supplied variable in which this function returns the total number of bytes mapped by all buffer descriptors chained to the packet descriptor.

Remarks

Drivers use this function to get information about the initial buffer and the amount of data associated with a specified packet faster than they can by calling the NdisQueryPacket function, and then the NdisQueryBuffer function.

A driver that calls this function runs at IRQL <= DISPATCH_LEVEL.

Requirements

Runs on Versions Defined in Include Link to
Windows CE OS 2.0 and later Ndis.h    

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

NdisGetNextBuffer, NdisQueryBuffer

 Last updated on Tuesday, July 13, 2004

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