MmGetMdlByteCount macro (wdm.h)
The MmGetMdlByteCount macro returns the length, in bytes, of the buffer described by the specified MDL.
Syntax
ULONG MmGetMdlByteCount(
[in] PMDL Mdl
);
Parameters
Mdl
A pointer to an MDL structure that describes the layout of a virtual memory buffer in physical memory. For more information, see Using MDLs.
Return value
MmGetMdlByteCount returns the length, in bytes, of the buffer described by Mdl.
Remarks
Macro definition:
#define MmGetMdlByteCount(Mdl) ((Mdl)->ByteCount)
Callers of MmGetMdlByteCount can be running at any IRQL. Usually, callers are running at IRQL <= DISPATCH_LEVEL.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Desktop |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| IRQL | Any level (see Remarks section) |
| DDI compliance rules | MdlAfterReqCompletedIntIoctlA(kmdf), MdlAfterReqCompletedIoctlA(kmdf), MdlAfterReqCompletedReadA(kmdf), MdlAfterReqCompletedWriteA(kmdf) |