ACPI_METHOD_ARGUMENT_V1 structure (acpiioct.h)
The ACPI_METHOD_ARGUMENT structure contains the value of an input or output argument of an ACPI control method.
Syntax
typedef struct _ACPI_METHOD_ARGUMENT_V1 {
USHORT Type;
USHORT DataLength;
union {
ULONG Argument;
UCHAR Data[ANYSIZE_ARRAY];
} DUMMYUNIONNAME;
} ACPI_METHOD_ARGUMENT_V1, ACPI_METHOD_ARGUMENT;
Members
Type
The type of the method argument, as specified by one of the following:
ACPI_METHOD_ARGUMENT_INTEGER
Argument contains an integer value of type ULONG.
ACPI_METHOD_ARGUMENT_STRING
The Data array contains a NULL-terminated ASCII string, and DataLength supplies the number of characters in the string, including the NULL terminator.
ACPI_METHOD_ARGUMENT_BUFFER
The Data array contains custom data, and DataLength supplies the number of consecutive array elements that contain the custom data, beginning with the Data[0] element.
ACPI_METHOD_ARGUMENT_PACKAGE
The Data array contains an ACPI package descriptor and DataLength supplies the number of consecutive array elements that contain the package descriptor, beginning with the Data[0] element.
DataLength
The number of UCHAR elements in the Data array that contains the argument data.
DUMMYUNIONNAME
DUMMYUNIONNAME.Argument
An argument value of type ULONG.
DUMMYUNIONNAME.Data[ANYSIZE_ARRAY]
An array of values of type UCHAR that contains argument data.
Remarks
An ACPI_EVAL_OUTPUT_BUFFER structure includes an Argument array of ACPI_METHOD_ARGUMENT structures. The following IOCTLs evaluate control methods and return output arguments in an ACPI_EVAL_OUTPUT_BUFFER structure:
IOCTL_ACPI_ASYNC_EVAL_METHOD_EX
The ACPI_METHOD_ARGUMENT structure is also used to supply an array of complex input arguments to a control method. The ACPI_EVAL_INPUT_BUFFER_COMPLEX and ACPI_EVAL_INPUT_BUFFER_COMPLEX_EX structures includes an Argument array of type ACPI_METHOD_ARGUMENT.
For more information about how to use ACPI_METHOD_ARGUMENT structures to supply and retrieve argument data to an ACPI control method, see Evaluating ACPI Control Methods.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 and later versions of Windows. |
| Header | acpiioct.h (include Acpiioct.h) |
See also
ACPI_EVAL_INPUT_BUFFER_COMPLEX