play - Win32 Multimedia Programmer's Reference

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play

The play command starts playing a device. CD audio, digital-video, MIDI sequencer, videodisc, VCR, and waveform-audio devices recognize this command.

wsprintf(lpstrCommand, "play %s %s %s", lpszDeviceID, lpszPlayFlags,
lpszFlags);

Parameters
lpszDeviceID
Identifier of an MCI device. This identifier or alias is assigned when the device is opened.

lpszPlayFlags
Flag for playing a device. The following table lists device types that recognize the play command and the flags used by each type:

cdaudio	from position	to position
digitalvideo	from position fullscreen repeat	reverse to position window
sequencer	from position	to position
cr	at time from position reverse	scan to position
ideodisc	fast from position reverse scan	slow speed integer to position
waveaudio	from position	to position

The following table lists the flags that can be specified in the lpszPlayFlags parameter and their meanings:

at time	Indicates when the device should begin performing this command, or, if the device has been cued, when the cued command begins. For more information, see the cue command.
fast	Indicates that the device should play faster than normal. To determine the exact speed on a videodisc player, use the "speed" flag of the status command. To specify the speed more precisely, use the "speed" flag of this command.
from position	Specifies a starting position for the playback. If the "from" flag is not specified, playback begins at the current position. For cdaudio devices, if the "from" position is greater than the end position of the disc, or if the "from" position is greater than the "to" position, the driver returns an error. For videodisc devices, the default positions are in frames for CAV discs and in hours, minutes, and seconds for CLV discs.
fullscreen	Specifies that a full-screen display should be used. Use this flag only when playing compressed files. (Uncompressed files won't play full-screen.)
repeat	Specifies that playback should restart when the end of the content is reached.
reverse	Specifies that the play direction is backward. You cannot specify an ending location with the "reverse" flag. For videodiscs, "scan" applies only to CAV format.
scan	Plays as fast as possible without disabling video (although audio might be disabled). For videodiscs, "scan" applies only to CAV format.
slow	Plays slowly. To determine the exact speed on a videodisc player, use the "speed" flag of the status command. To specify the speed more precisely, use the "speed" flag of this command. For videodiscs, "slow" applies only to CAV format.
speed integer	Plays a videodisc at the specified speed, in frames per second. This flag applies only to CAV discs.
to position	Specifies an ending position for the playback. If the "to" flag is not specified, playback stops at the end of the content. For cdaudio devices, if the "to" position is greater than the end position of the disc, the driver returns an error. For videodisc devices, the default positions are in frames for CAV discs and in hours, minutes, and seconds for CLV discs.
window	Specifies that playing should use the window associated with the device instance. This is the default setting.

lpszFlags

Can be "wait", "notify", or both. For digital-video and VCR devices, "test" can also be specified. For more information about these flags, see The Wait, Notify, and Test Flags.

Return Values
Returns zero if successful or an error otherwise.

Remarks
Before issuing commands that use position values, you should set the desired time format by using the set command. This command begins playing at the current speed, as set with the set "speed" command. The direction is reverse if the "reverse" flag is specified, or if the "to" flag is specified as a value less than the "from" flag. If the "from" flag is not specified, playback begins at the current position. The "to" and "reverse" flags cannot be used together.

The following command plays the "mysound" device from position 1000 through position 2000, sending a notification message when the playback completes:

play mysound from 1000 to 2000 notify

See Also
cue, set, status

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