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Module: Multimedia in Category General VBA/VB6 : Multimedia from Total Visual SourceBook

Routines for working with multimedia devices in VB6 and VBA with 32 and 64-bit Windows API calls.

The module contains miscellaneous multimedia functions dealing with waveform audio files. The routines allow you to play or stop playing Windows .WAV files, to get and set the volume levels for wave devices, and to determine whether your user's machine supports waveform audio.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the modMultimedia module.
CanPlayWaveData	Procedure	Determine if there is a device capable of playing wave files.
dblToLong	Procedure	Perform an unsigned conversion from a double to a long integer value. This function correctly handles doubles greater than 2,147,483,647 and less than or equal to 4,294,967,295.
HiWord	Procedure	Get the high integer of the passed long.
IntToLong	Procedure	Convert an integer value to a long integer value, treating the integer as unsigned.
LongToInt	Procedure	Perform an unsigned conversion from a long value to an integer value.
LoWord	Procedure	Get the low integer of the passed long.
MakeLong	Procedure	Combine two words (integers) into a long. This routine correctly handles negative input values.
WaveGetCurrentVolume	Procedure	Get the volume level (overall, left and right) settings for waveform audio devices. Note that the values for the Left and Right channel are modified by this procedure. This means that you should examine the values of the passed variables after calling the function. Do not pass a literal or constant as the lngLeft or lngRight arguments, since they cannot be modified.
WavePlaySound	Procedure	Play a .wav file.
WaveSetCurrentVolume	Procedure	Set the left and right stereo volume levels for a waveform audio device. The settings should be set to values between 0 and 65535. To change the balance between the left and right channels, use different values for each. Some audio devices may not be able to select the level you specify and will use the closest available value.
WaveTerminateSound	Procedure	Terminate a sound immediately. Use this to stop a waveform audio sound that is playing asynchronously, or in a loop.

Example Code for Using Module: Multimedia

' Example of the modMultimedia module
'
' To use this example:
' 1. Create a new form.
' 2. Create a command button called cmdTest
' 3. Create a command button called cmdPlay
' 4. Create a command button called cmdStop
' 5. Create a command button called cmdIncreaseVol
' 6. Create a command button called cmdDecreaseVol
' 7. Paste the entire contents of this module into the new form's module.

' This example assumes that the sample files are located in the folder named by the following constant.
Private Const mcstrSamplePath As String = "C:\Total Visual SourceBook 2013\Samples\"

Private Sub cmdDecreaseVol_Click()
  Dim lngLeft As Long
  Dim lngRight As Long
  Dim lngVolume As Long

  ' Get current channel settings
  lngVolume = WaveGetCurrentVolume(lngLeft, lngRight)

  ' Decrease left and right channels equally
  WaveSetCurrentVolume lngLeft - 1000, lngRight - 1000

End Sub

Private Sub cmdIncreaseVol_Click()
  Dim lngLeft As Long
  Dim lngRight As Long
  Dim lngVolume As Long

  ' Get current channel settings
  lngVolume = WaveGetCurrentVolume(lngLeft, lngRight)

  ' Increate left and right channels equally
  WaveSetCurrentVolume lngLeft + 1000, lngRight + 1000

End Sub

Private Sub cmdPlay_Click()
  Dim strWave As String

  strWave = mcstrSamplePath & "test.wav"
  ' Play a sample wave file
  WavePlaySound strWave, mmpfSND_ASYNC

End Sub

Private Sub cmdStop_Click()
  ' Stop an asynchronous wave file while it is playing
  WaveTerminateSound
End Sub

Private Sub cmdTest_Click()
  Dim lngLeft As Long
  Dim lngRight As Long
  Dim lngVolume As Long

  ' Test CanPlayWaveData
  If Not CanPlayWaveData() Then
    MsgBox "No wave-capable devices found"
  Else

    ' Get current channel volume levels
    lngVolume = WaveGetCurrentVolume(lngLeft, lngRight)

    Debug.Print "-----------"
    Debug.Print "Left volume: " & lngLeft
    Debug.Print "Right volume: " & lngRight
    Debug.Print "Total volume: " & lngVolume

  End If

End Sub

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