NdisQueryMdl macro

The NdisQueryMdl macro retrieves the buffer length, and optionally the base virtual address, from an MDL.

Syntax

VOID NdisQueryMdl(
    _Mdl,
    _VirtualAddress,
    _Length,
    _Priority
);

Parameters

_Mdl
MDL 的指標。

_VirtualAddress
呼叫端提供的變數指標，此巨集會傳回 MDL 所描述之虛擬位址範圍的基底虛擬位址。 The base virtual address can be NULL for either of the following reasons:

• System resources are low or exhausted and the _Priority parameter is set to LowPagePriority or NormalPagePriority.

• System resources are exhausted and the _Priority parameter is set to HighPagePriority.

_Length
呼叫端提供的變數指標，此巨集會傳回 MDL 描述的虛擬位址範圍的長度（以位元組為單位）。

_Priority
頁面優先順序值。 For a list of the possible values for this parameter, see the Priority parameter of the MmGetSystemAddressForMdlSafe macro.

Return value

None

Remarks

The NdisQueryMdl macro provides an MDL-based version of the NdisQueryBuffer function.

Requirements

See also

MmGetSystemAddressForMdlSafe

NdisQueryBuffer