IPortWaveRTStream::GetPhysicalPagesCount method (portcls.h)
The GetPhysicalPagesCount method returns the count of the physical pages in a memory descriptor list (MDL).
Syntax
ULONG GetPhysicalPagesCount(
[in] PMDL MemoryDescriptorList
);
Parameters
[in] MemoryDescriptorList
Pointer to the MDL.
Return value
GetPhysicalPagesCount method returns the count of physical pages in the MDL.
Remarks
The miniport driver uses this call to determine the number of physical pages that are contained within an MDL. The count is typically used in the process of programming the DMA hardware.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows Vista and later Windows operating systems. |
| Target Platform | Universal |
| Header | portcls.h |
| IRQL | Passive level. |
See also
IPortWaveRTStream::AllocateContiguousPagesForMdl