WDF_REQUEST_PARAMETERS structure (wdfrequest.h)
[Applies to KMDF and UMDF]
The WDF_REQUEST_PARAMETERS structure receives parameters that are associated with an I/O request.
Syntax
typedef struct _WDF_REQUEST_PARAMETERS {
USHORT Size;
UCHAR MinorFunction;
WDF_REQUEST_TYPE Type;
union {
struct {
PIO_SECURITY_CONTEXT SecurityContext;
ULONG Options;
USHORT POINTER_ALIGNMENT FileAttributes;
USHORT ShareAccess;
ULONG POINTER_ALIGNMENT EaLength;
} Create;
struct {
size_t Length;
ULONG POINTER_ALIGNMENT Key;
LONGLONG DeviceOffset;
} Read;
struct {
size_t Length;
ULONG POINTER_ALIGNMENT Key;
LONGLONG DeviceOffset;
} Write;
struct {
size_t OutputBufferLength;
size_t POINTER_ALIGNMENT InputBufferLength;
ULONG POINTER_ALIGNMENT IoControlCode;
PVOID Type3InputBuffer;
} DeviceIoControl;
struct {
PVOID Arg1;
PVOID Arg2;
ULONG POINTER_ALIGNMENT IoControlCode;
PVOID Arg4;
} Others;
} Parameters;
} WDF_REQUEST_PARAMETERS, *PWDF_REQUEST_PARAMETERS;
Members
Size
The size, in bytes, of this structure.
MinorFunction
The IRP minor function code, if any, that is associated with the I/O request. Some major function codes have associated minor function codes.
Type
A WDF_REQUEST_TYPE-typed value that identifies the I/O request's type.
Parameters
Parameters that are unique for each IRP major function code. This member contains a subset of the Parameters member of the IO_STACK_LOCATION structure.
Parameters.Create
Parameters for IRP_MJ_CREATE.
Parameters.Create.SecurityContext
Parameters.Create.Options
Parameters.Create.FileAttributes
Parameters.Create.ShareAccess
Parameters.Create.EaLength
Parameters.Read
Parameters for IRP_MJ_READ.
Parameters.Read.Length
Parameters.Read.Key
Parameters.Read.DeviceOffset
Parameters.Write
Parameters for IRP_MJ_WRITE.
Parameters.Write.Length
Parameters.Write.Key
Parameters.Write.DeviceOffset
Parameters.DeviceIoControl
Parameters for IRP_MJ_DEVICE_CONTROL and IRP_MJ_INTERNAL_DEVICE_CONTROL.
Parameters.DeviceIoControl.OutputBufferLength
Parameters.DeviceIoControl.InputBufferLength
Parameters.DeviceIoControl.IoControlCode
Parameters.DeviceIoControl.Type3InputBuffer
Parameters.Others
Use of this member is defined by the driver stack.
Parameters.Others.Arg1
Parameters.Others.Arg2
Parameters.Others.IoControlCode
Parameters.Others.Arg4
Remarks
The WDF_REQUEST_PARAMETERS structure is used as input to WdfRequestGetParameters. Drivers must call WDF_REQUEST_PARAMETERS_INIT to initialize this structure before they call WdfRequestGetParameters.
Requirements
| Requirement | Value |
|---|---|
| Minimum KMDF version | 1.0 |
| Minimum UMDF version | 2.0 |
| Header | wdfrequest.h (include Wdf.h) |