Windows Multimedia DDK (mddkqh.hlp) (
Table of Contents;
Topic list)
MCI_STATUS
◄Contents► ◄Index► ◄Back►
────────────────────────────────────────────────────────────────────────────
MCI_STATUS
This MCI command message is used to obtain information about an
MCI device. All devices respond to this message. The parameters
and flags available for this message depend on the selected
device. Information is returned in the dwReturn field of the data
structure identified by lpStatus.
Parameters
DWORD dwFlags
The following standard and command-specific flags apply to
all devices:
MCI_NOTIFY
Specifies that MCI should post the MM_MCINOTIFY message
when this command completes. The window to receive this
message is specified in the dwCallback field of the data
structure identified by lpStatus.
MCI_WAIT
Specifies that the status operation should finish before
MCI returns control to the application.
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following constants
define which status item to return in the dwReturn field
of the data structure:
MCI_STATUS_CURRENT_TRACK
The dwReturn field is set to the current track
number. MCI uses continuous track numbers.
MCI_STATUS_LENGTH
The dwReturn field is set to the total media length.
MCI_STATUS_MODE
The dwReturn field is set to the current mode of the
device. The modes include the following:
MCI_MODE_NOT_READY
MCI_MODE_PAUSE
MCI_MODE_PLAY
MCI_MODE_STOP
MCI_MODE_OPEN
MCI_MODE_RECORD
MCI_MODE_SEEK
MCI_STATUS_NUMBER_OF_TRACKS
The dwReturn field is set to the total number of
playable tracks.
MCI_STATUS_POSITION
The dwReturn field is set to the current position.
MCI_STATUS_READY
The dwReturn field is set to TRUE if the device is
ready; otherwise, it is set to FALSE.
MCI_STATUS_TIME_FORMAT
The dwReturn field is set to the current time format
of the device. The time formats include:
MCI_FORMAT_BYTES
MCI_FORMAT_FRAMES
MCI_FORMAT_HMS
MCI_FORMAT_MILLISECONDS
MCI_FORMAT_MSF
MCI_FORMAT_SAMPLES
MCI_FORMAT_TMSF
MCI_STATUS_START
Obtains the starting position of the media. To get the
starting position, combine this flag with
MCI_STATUS_ITEM and set the dwItem field of the data
structure identified by lpStatus to MCI_STATUS_POSITION.
MCI_TRACK
Indicates a status track parameter is included in the
dwTrack field of the data structure identified by
lpStatus. You must use this flag with the
MCI_STATUS_POSITION or MCI_STATUS_LENGTH constants.
When used with MCI_STATUS_POSITION, MCI_TRACK obtains
the starting position of the specified track.
When used with MCI_STATUS_LENGTH, MCI_TRACK obtains the
length of the specified track. MCI uses continuous track
numbers.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure. (Devices with extended command sets might replace
this data structure with a device-specific data structure.)
Animation Extensions
DWORD dwFlags
The following extensions apply to animation devices:
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following additional
status constants are defined for animation devices and
indicate which item to return in the dwReturn field of
the data structure:
MCI_ANIM_STATUS_FORWARD
The dwReturn field is set to TRUE if playing forward;
otherwise, it is set to FALSE.
MCI_ANIM_STATUS_HPAL
The dwReturn field is set to the handle of the
palette.
MCI_ANIM_STATUS_HWND
The dwReturn field is set to the handle of the
playback window.
MCI_ANIM_STATUS_SPEED
The dwReturn field is set to the animation speed.
MCI_ANIM_STATUS_STRETCH
The dwReturn field is set to TRUE if stretching
is enabled; otherwise, it is set to FALSE.
MCI_STATUS_MEDIA_PRESENT
The dwReturn field is set to TRUE if the media is
inserted in the device; otherwise, it is set to
FALSE.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure.
Audio CD Extensions
DWORD dwFlags
The following extensions applies to audio CD devices:
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following additional
status constants are defined for audio CD devices and
indicate which item to return in the dwReturn field of
the data structure:
MCI_STATUS_MEDIA_PRESENT
The dwReturn field is set to TRUE if the media is
inserted in the device; otherwise, it is set to
FALSE.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure. This parameter replaces the standard default
parameter data structure.
MIDI Sequencer Extensions
DWORD dwFlags
The following extensions apply to sequencers:
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following additional
status constants are defined for sequencers and indicate
which item to return in the dwReturn field of the data
structure:
MCI_SEQ_STATUS_DIVTYPE
The dwReturn field is set to one of the following
values indicating the current division type of a
sequence:
MCI_SEQ_DIV_PPQN
MCI_SEQ_DIV_SMPTE_24
MCI_SEQ_DIV_SMPTE_25
MCI_SEQ_DIV_SMPTE_30
MCI_SEQ_DIV_SMPTE_30DROP
MCI_SEQ_STATUS_MASTER
The dwReturn field is set to the synchronization type
used for master operation.
MCI_SEQ_STATUS_OFFSET
The dwReturn field is set to the current SMPTE offset
of a sequence.
MCI_SEQ_STATUS_PORT
The dwReturn field is set to the MIDI device ID for
the current port used by the sequence.
MCI_SEQ_STATUS_SLAVE
The dwReturn field is set to the synchronization type
used for slave operation.
MCI_SEQ_STATUS_TEMPO
The dwReturn field is set to the current tempo of a
MIDI sequence in beats-per-minute for PPQN files, or
frames-per-second for SMPTE files.
MCI_STATUS_MEDIA_PRESENT
The dwReturn field is set to TRUE if the media for
the device is present; otherwise, it is set to
FALSE.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure. This parameter replaces the standard default
parameter data structure.
Videodisc Extensions
DWORD dwFlags
The following additional flags apply to videodisc devices:
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following additional
status constants are defined for videodisc devices and
indicate which item to return in the dwReturn field of
the data structure:
MCI_STATUS_MEDIA_PRESENT
The dwReturn field is set to TRUE if the media is
inserted in the device; otherwise, it is set to
FALSE.
MCI_VD_STATUS_DISC_SIZE
The dwReturn field is set to the size of the loaded
disc in inches (8 or 12).
MCI_VD_STATUS_FORWARD
The dwReturn field is set to TRUE if playing forward;
otherwise, it is set to FALSE.
MCI_VD_STATUS_MEDIA_TYPE
The dwReturn field is set to the media type of the
inserted media. The following media types can be
returned:
MCI_VD_MEDIA_CAV
MCI_VD_MEDIA_CLV
MCI_VD_MEDIA_OTHER
MCI_STATUS_MODE
The dwReturn field is set to the current mode of the
device. All devices can return the following
constants to indicate the current mode:
MCI_MODE_NOT_READY
MCI_MODE_PAUSE
MCI_MODE_PLAY
MCI_MODE_STOP
MCI_VD_MODE_PARK (videodisc devices)
MCI_VD_STATUS_SIDE
The dwReturn field is set to 1 or 2 to indicate which
side of the disc is loaded. Not all videodisc
devices support this flag.
MCI_VD_STATUS_SPEED
The dwReturn field is set to the play
speed in frames per second.
MCIPIONR returns MCIERR_UNSUPPORTED_FUNCTION.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure. This parameter replaces the standard default
parameter data structure.
Waveform Audio Extensions
DWORD dwFlags
The following additional flags apply to waveform audio
devices:
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following additional
status constants are defined for waveform audio devices
and indicate which item to return in the dwReturn field
of the data structure:
MCI_STATUS_MEDIA_PRESENT
The dwReturn field is set to TRUE if the media is
inserted in the device; otherwise, it is set to
FALSE.
MCI_WAVE_INPUT
The dwReturn field is set to the wave input device
used for recording. If no device is in use and no
device has been explicitly set, then the error
return is MCI_WAVE_INPUTUNSPECIFIED.
MCI_WAVE_OUTPUT
The dwReturn field is set to the wave output device
used for playing. If no device is in use and no
device has been explicitly set, then the error
return is MCI_WAVE_OUTPUTUNSPECIFIED.
MCI_WAVE_STATUS_AVGBYTESPERSEC
The dwReturn field is set to the current bytes per
second used for playing, recording, and saving.
MCI_WAVE_STATUS_BITSPERSAMPLE
The dwReturn field is set to the current bits per
sample used for playing, recording, and saving.
MCI_WAVE_STATUS_BLOCKALIGN
The dwReturn field is set to the current block
alignment used for playing, recording, and saving.
MCI_WAVE_STATUS_CHANNELS
The dwReturn field is set to the current channel
count used for playing, recording, and saving.
MCI_WAVE_FORMATTAG
The dwReturn field is set to the current format tag
used for playing, recording, and saving.
MCI_WAVE_STATUS_LEVEL
The dwReturn field is set to the current record or
playback level. The value is returned as an 8- or
16-bit value, depending on the sample size used. The
right or mono channel level is returned in the
low-order word. The left channel level is returned
in the high-order word.
MCI_WAVE_STATUS_SAMPLESPERSEC
The dwReturn field is set to the current samples per
second used for playing, recording, and saving.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure.
Video Overlay Extensions
DWORD dwFlags
The following additional flags apply to video overlay
devices:
MCI_STATUS_ITEM
Specifies that the dwItem field of the data structure
identified by lpStatus contains a constant specifying
which status item to obtain. The following additional
status constants are defined for video overlay devices
and indicate which item to return in the dwReturn field
of the data structure:
MCI_OVLY_STATUS_HWND
The dwReturn field is set to the handle of the window
associated with the video overlay device.
MCI_OVLY_STATUS_STRETCH
The dwReturn field is set to TRUE if stretching
is enabled; otherwise, it is set to FALSE.
MCI_STATUS_MEDIA_PRESENT
The dwReturn field is set to TRUE if the media is
inserted in the device; otherwise, it is set to
FALSE.
LPMCI_STATUS_PARMS lpStatus
Specifies a far pointer to the MCI_STATUS_PARMS data
structure.
Return value
Returns zero if successful. Otherwise, it returns an MCI error
code.
-♦-