IOCTL_CDROM_GET_VOLUME IOCTL (ntddcdrm.h)
Determines the current volume for each of its device's audio ports. Obsolete, beginning with Windows Vista.
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.
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.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Obsolete, beginning with Windows Vista. |
| Header | ntddcdrm.h (include Ntddcdrm.h) |