IoSizeOfIrp macro (wdm.h)

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

Syntax

C++

void IoSizeOfIrp(
  [in]  StackSize
);

[in] StackSize

Specifies the number of stack locations for the IRP.

None

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.

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