FltDeviceIoControlFile function

FltDeviceIoControlFile sends a control code directly to a specified device driver, causing the corresponding driver to perform the specified action.

Syntax

NTSTATUS FLTAPI FltDeviceIoControlFile(
  PFLT_INSTANCE Instance,
  PFILE_OBJECT  FileObject,
  ULONG         IoControlCode,
  PVOID         InputBuffer,
  ULONG         InputBufferLength,
  PVOID         OutputBuffer,
  ULONG         OutputBufferLength,
  PULONG        LengthReturned
);

Parameters

Instance

Opaque instance pointer for the caller. This parameter is required and cannot be NULL.

FileObject

File object pointer for the file or device that is the target of this request. This parameter is required and cannot be NULL.

IoControlCode

IOCTL_XXX code that indicates which device I/O operation is to be carried out. The value of this parameter determines the formats and required lengths of the InputBuffer and OutputBuffer, and it determines which of the following parameter pairs (InputBuffer and InputBufferLength, or OutputBuffer and OutputBufferLength) is required.

InputBuffer

Pointer to a caller-allocated input buffer that contains device-specific information to be given to the target driver. If the IoControlCode parameter specifies an operation that does not require input data, this parameter is optional and can be NULL.

InputBufferLength

Size, in bytes, of the buffer at InputBuffer. This value is ignored if InputBuffer is NULL.

OutputBuffer

Pointer to a caller-allocated output buffer in which information is returned from the target driver. If the IoControlCode parameter specifies an operation that does not require output data, this parameter is optional and can be NULL.

OutputBufferLength

Size, in bytes, of the buffer at OutputBuffer. This value is ignored if OutputBuffer is NULL.

LengthReturned

Pointer to a caller-allocated variable that receives the size, in bytes, of the information returned in the buffer at OutputBuffer. This parameter is optional and can be NULL.

Return Value

FltDeviceIoControlFile returns STATUS_SUCCESS or an appropriate NTSTATUS value.

Remarks

For more information about the system-defined IOCTL_XXX codes, see the Remarks section of the reference entry for DeviceIoControl in the Microsoft Windows SDK documentation.

Requirements

   
Target Platform Universal
Header fltkernel.h (include Fltkernel.h)
Library FltMgr.lib
IRQL PASSIVE_LEVEL

See Also

FltFsControlFile