// acpiioct.h

typedef struct _ACPI_EVAL_INPUT_BUFFER_V1 {
  ULONG Signature;
  union {
    UCHAR MethodName[4];
    ULONG MethodNameAsUlong;
  } DUMMYUNIONNAME;
} ACPI_EVAL_INPUT_BUFFER_V1, *PACPI_EVAL_INPUT_BUFFER_V1, ACPI_EVAL_INPUT_BUFFER, *PACPI_EVAL_INPUT_BUFFER;
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Windows Driver Kit DDI reference (ns-acpiioct-_acpi_eval_input_buffer_v1)

_ACPI_EVAL_INPUT_BUFFER_V1 structure

Description

The ACPI_EVAL_INPUT_BUFFER structure is used as input to an IOCTL_ACPI_EVAL_METHOD request and to an IOCTL_ACPI_ASYNC_EVAL_METHOD request. The structure supplies the name of a control method that does not take an input argument.

Members

`Signature`

The signature of an input buffer that does not include an argument, which must be set to ACPI_EVAL_INPUT_BUFFER_SIGNATURE.

`DUMMYUNIONNAME`

`DUMMYUNIONNAME.MethodName`

A four-element ASCII character array that contains the name of a control method, for example, 'ABCD.'

`DUMMYUNIONNAME.MethodNameAsUlong`

A value of type ULONG that contains the name of the method in the format (ULONG) ('DCBA'), where the method name is the four-element ASCII character array 'ABCD.'

Remarks

If a device supports a control method named 'ABCD' that does not take an input argument, a driver for the device can evaluate the method by sending an IOCTL_ACPI_EVAL_METHOD request or an IOCTL_ACPI_ASYNC_EVAL_METHOD request to the device and setting the members of the input ACPI_EVAL_INPUT_BUFFER structure as follows:

Set Signature to ACPI_EVAL_INPUT_BUFFER_SIGNATURE.
Set MethodName to 'ABCD' or MethodNameAsUlong to (ULONG)('DCBA').

For more information about how to use this structure, see Evaluating ACPI Control Methods.

ACPI_EVAL_INPUT_BUFFER_V1 - NtDoc