Sound

Using Sound

You create a sound channel by sending it the

Open

function.

The code that creates a sound channel for playback might look like the
following example:

mySndChn := {_proto:protoSoundChannel};
mySndChn:Open();

Once you create the sound channel, you can use any of the following methods to
control the sound.

Schedule

--queues the sound for play.

Start

--starts playing the sounds in the order that they were scheduled.

Stop

--stops all scheduled sounds including currently playing sounds, if any.

Pause

--temporarily stops the current playback process in the specified

sound channel.

IsPaused

--checks to see if the sound channel is paused.

IsActive

--checks to see if the sound channel is playing.

When finished with the sound channel, you need to dispose of it by sending the

Close

message to it. Most applications can dispose of the sound channel as soon

as playback is completed; the callback function associated with a sound frame is an
appropriate way to send the

Close

message to the channel.

The system sound channel is never automatically disposed of even
if the sound channel frame is garbage collected. You must send
the

Close

message to the channel to dispose of the system

sound channel.

Playing Sound Programmatically

14

You can use any of the global functions to play sound programmatically. For
example, you might want to play a sound when the user taps a button, or when
a lengthy operation is complete. Sounds can be played synchronously or
asynchronously, as described in the following section.