Apple Newton Utilities User's Guide download pdf (Page 560)

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CHAPTER 14

Sound

14-6 Using Sound

Creating a Sound Channel for Playback 14

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();

Playing Sounds 14

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.

Deleting the Sound Channel 14

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.

Note

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.

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