Edit

Share via

ChangerClassDeviceControl function (mcd.h)

  • Article

The ChangerClassDeviceControl routine is called by a changer minidriver to allow the class driver perform device-independent aspects of a device control operation.

Syntax

NTSTATUS ChangerClassDeviceControl(
  [in] PDEVICE_OBJECT DeviceObject,
  [in] PIRP           Irp
);

Parameters

[in] DeviceObject

Pointer to the device object of the device.

[in] Irp

Pointer to the I/O request packet (IRP) that initiated the device control operation.

Return value

If the operation succeeds, the ChangerClassDeviceControl routine returns STATUS_SUCCESS. Otherwise the routine returns one of the following status values.

Return code Description
STATUS_NO_SUCH_DEVICE
 The device object does not have a properly initialized device extension.
STATUS_INFO_LENGTH_MISMATCH
 The length of the output buffer indicated in the IRP is too small to hold the return data.
STATUS_BUFFER_TOO_SMALL
 The length of the input buffer indicated in the IRP is too small to hold the input data that is necessary to complete the operation.
STATUS_INVALID_PARAMETER
 The length of the input buffer is zero.

Requirements

Requirement Value
Target Platform Desktop
Header mcd.h (include Mcd.h, Ntddchgr.h)