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IoSizeOfIrp macro (wdm.h)

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The IoSizeOfIrp routine determines the size in bytes for an IRP, given the number of stack locations in the IRP.

Syntax

void IoSizeOfIrp(
  [in]  StackSize
);

Parameters

[in] StackSize

Specifies the number of stack locations for the IRP.

Return value

None

Remarks

IoSizeOfIrp returns the size, in bytes, of the IRP.

The input StackSize value is either that of the next-lower driver's device object or one more than that value.

Requirements

Requirement Value
Minimum supported client Available starting with Windows 2000.
Target Platform Desktop
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
IRQL Any level

See also

IoAllocateIrp

IoMakeAssociatedIrp