Windows API Guide: SOUNDSENTRY Structure


Declare Function waveOutGetDevCaps Lib "winmm.dll" Alias "waveOutGetDevCapsA" (ByVal uDeviceID As Long, lpCaps As WAVEOUTCAPS, ByVal uSize As Long) As Long

Platforms: Win 95/98, Win NT

waveOutGetDevCaps reads the capabilities and other information about a given waveform output device. This information is placed in the structure passed as lpCaps. This function can determine what operations a waveform output device can perform. The function returns 0 if successful, or a non-zero error code if an error occured.

uDeviceID
The device identifier of the waveform output device to get information about. Remember that the first device has an identifier of 0.
lpCaps
Receives the information about the waveform output device.
uSize
The size in bytes of lpCaps.
' List the names and number of channels of every installed waveform output ' device.  Note how we only check the valid device identifiers. Dim outinfo As WAVEOUTCAPS ' receives info about each device Dim numdevs As Long  ' number of installed devices Dim thisdev As Long  ' counter for which device we're checking Dim outname As String  ' buffer for device's name Dim retval As Long  ' return value ' First, determine the number of waveform output devices. numdevs = waveOutGetNumDevs() ' Loop through each device and display the desired information.  Keep in mind that the first ' device has an identifier of 0, etc. For thisdev = 0 To numdevs - 1   ' Get the capabilities of the device   retval = waveOutGetDevCaps(thisdev, outinfo, Len(outinfo))   If retval = 0 Then  ' only continue if the above function succeeded     Debug.Print "Device #"; thisdev     ' Extract device name from fixed-length string     outname = Left(outinfo.szPname, InStr(outinfo.szPname, vbNullChar) - 1)     Debug.Print "  "; outname;     ' Display number of channels -- i.e., is it mono or stereo?     If outinfo.nChannels = 1 Then       Debug.Print " (mono)"     Else       Debug.Print " (stereo)"     End If   End If Next thisdev

Category: Audio

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Windows API Guide
Windows API Guide - Reference - Volume 1: Version 3.0 For the MS-DOS and PC-DOS Operating Systems
ISBN: B001V0KQIY
EAN: N/A
Year: 1998
Pages: 610

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