Playing WAV sounds simultaneously -- Visual FoxPro : Using Win32 (WinAPI) Functions


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Playing WAV sounds simultaneously

User rating: 8/10 (1 votes)

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Before you begin:

This code is written in response to a question posted on UT: Ride two WAVs at once?

The sndPlaySound is not suitable for this. To play multiple sounds simultaneously, the waveOut* functions must be used.

See also:

WAV file player

WAV file recorder

How to play MIDI notes


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User rating: 8/10 (1 votes)

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6885 bytes
Created: 2007-02-16 18:22:01
Modified: 2012-09-19 14:17:50
Visits in 7 days: 126

Listed functions:

GlobalAlloc
GlobalFree
mmioAscend
mmioClose
mmioDescend
mmioOpen
mmioRead
waveOutClose
waveOutOpen
waveOutPrepareHeader
waveOutReset
waveOutUnprepareHeader
waveOutWrite

My comment:

The code above contains two classes. The WavPlayer class wraps API declarations and acts as a factory for creating instances of the WavSound class.

On Init, an instance of WavSound opens specified WAV file, loads it in memory, and makes ready to be played.

Here is a code for testing WavPlayer and WavSound classes.

PUBLIC wp As WavPlayer
wp = CREATEOBJECT("WavPlayer")

wp.LoadWavSound("C:\WINDOWS\Media\Windows XP Logoff Sound.wav")
wp.LoadWavSound("C:\WINDOWS\Media\Windows XP Startup.wav")
wp.LoadWavSound("C:\WINDOWS\Media\Windows XP Logon Sound.wav")
wp.LoadWavSound("C:\WINDOWS\Media\tada.wav")
wp.LoadWavSound("C:\WINDOWS\Media\notify.wav")
wp.LoadWavSound("C:\WINDOWS\Media\chord.wav")
wp.LoadWavSound("C:\WINDOWS\Media\Windows XP Shutdown.wav")

FOR nTimes=1 TO 1
        FOR nIndex=1 TO wp.WavSounds.Count
                wp.PlayWavSound(m.nIndex)
                = INKEY(0.1)
        NEXT
NEXT

Note that wp variable must not be released while the sounds are being played. For that reason it is declared PUBLIC.

API function mmioRead is declared twice with two different interfaces. In VFP versions 3 to 7, these declarations must be moved to LoadWaveFile method of WavSound class and placed each before corresponding call.

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