IOCTL_CDROM_GET_VOLUME - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntddcdrm.h

// CTL_CODE(0x0002, 0x005, METHOD_BUFFERED, FILE_READ_ACCESS)
#define IOCTL_CDROM_GET_VOLUME 0x00024014
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ni-ntddcdrm-ioctl_cdrom_get_volume)

IOCTL_CDROM_GET_VOLUME IOCTL

Description

Determines the current volume for each of its device's audio ports. Obsolete, beginning with Windows Vista.

Parameters

Major code

Input buffer

Input buffer.

Input buffer length

Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location indicates the size, in bytes, of the buffer, which must be greater than or equal to sizeof(VOLUME_CONTROL).

Output buffer

The driver returns the VOLUME_CONTROL data in the buffer at Irp->AssociatedIrp.SystemBuffer.

Output buffer length

Length of the VOLUME_CONTROL data.

Input/output buffer

Input/output buffer length

Status block

The Information field is set to sizeof(VOLUME_CONTROL) when the Status field is set to STATUS_SUCCESS. Otherwise, the Information field is set to zero, and the Status field possibly can be set to STATUS_BUFFER_TOO_SMALL, STATUS_DEVICE_NOT_READY, STATUS_IO_DEVICE_ERROR, STATUS_VERIFY_REQUIRED, or STATUS_IO_TIMEOUT.

Remarks

Beginning with Windows Vista, CDROM class drivers do not use this IOCTL. Prior to Windows Vista, this IOCTL was used for audio playback on older CD-ROM drives that supported direct audio output in hardware.

Client applications should use the Media Control Interface (MCI) API rather than issuing this IOCTL.

See also

VOLUME_CONTROL

View the official Windows Driver Kit DDI reference

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