WriteIoSpaceEx64 function (wdbgexts.h)

Article
04/01/2021

The WriteIoSpaceEx64 function is an extended version of WriteIoSpace64. It can write to either a system I/O location or an I/O location on a bus. WriteIoSpace64 works like WriteIoSpaceEx64, except that it defaults interfacetype to ISA, busnumber to zero, and addressspace to 1.

Syntax

void WriteIoSpaceEx64(
  ULONG64 address,
  ULONG   data,
  PULONG  size,
  ULONG   interfacetype,
  ULONG   busnumber,
  ULONG   addressspace
);

Parameters

address

Specifies the I/O address to write to.

data

Specifies the address of a variable that holds the data to write. This must be at least the number of bytes contained in size.

size

Specifies the address of a variable that contains the number of bytes to write. Size must be 1, 2, or 4. After the data is written, size will contain the number of bytes actually written.

interfacetype

Specifies the type of interface on which the extended I/O space exists. Possible values include ISA, EISA, and MCA. For more information, see ntddk.h, which is available as part of the Windows Driver Kit.

busnumber

Specifies the number of the bus on which the extended I/O space exists. This is typically zero, unless there is more than one bus of a given type.

addressspace

This is typically 1.

Return value

None

Remarks

If you are writing 32-bit code, you should use WriteIoSpaceEx instead. See 32-Bit Pointers and 64-Bit Pointers for details.

For a WdbgExts extension, include wdbgexts.h. For a DbgEng extension, include wdbgexts.h before dbgeng.h. See Writing DbgEng Extension Code for details.

Requirements

Requirement	Value
Target Platform	Desktop
Header	wdbgexts.h (include Wdbgexts.h, Dbgeng.h)

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