今天ttch問了我一個關於系統音效設備的問題，因為當時在忙，問題記得不是很清楚，依稀是問我如何取得混音設備… 翻了一下手邊的資料得知可以透過 Microsoft 提供的 Multimedia SDK 來取得，簡單的說，只要透過兩個API函數就可以得到解答，其中一個是取得系統混音設備的數量 mixerGetNumDevs ，另一個是用來列舉系統的混音設備資訊mixerGetDevCaps ，因此，一個簡單的程式下完成如下：
Const MAXPNAMELEN = 32
Private Type MIXERCAPS
wMid As Integer ‘ manufacturer id
wPid As Integer ‘ product id
vDriverVersion As Long ‘ version of the driver
szPname As String * MAXPNAMELEN ‘ product name
fdwSupport As Long ‘ misc. support bits
cDestinations As Long ‘ count of destinations
End Type
wMid As Integer ‘ manufacturer id
wPid As Integer ‘ product id
vDriverVersion As Long ‘ version of the driver
szPname As String * MAXPNAMELEN ‘ product name
fdwSupport As Long ‘ misc. support bits
cDestinations As Long ‘ count of destinations
End Type
Private Declare Function mixerGetNumDevs Lib "winmm.dll" () As Long
Private Declare Function mixerGetDevCaps Lib "winmm.dll" Alias "mixerGetDevCapsA" ( _
ByVal uMxId As Long, _
pmxcaps As MIXERCAPS, _
ByVal cbmxcaps As Long) As Long
Private Sub Form_Load()
Dim ctr As MIXERCAPS
Dim count As Long
count = mixerGetNumDevs()
MsgBox "混音設備數量：" & count
For i = 0 To count – 1
ret = mixerGetDevCaps(i, ctr, Len(ctr))
MsgBox ctr.szPname
Next
End Sub
Dim ctr As MIXERCAPS
Dim count As Long
count = mixerGetNumDevs()
MsgBox "混音設備數量：" & count
For i = 0 To count – 1
ret = mixerGetDevCaps(i, ctr, Len(ctr))
MsgBox ctr.szPname
Next
End Sub
其他相關的API或與多媒體有關的可以參考 Microsoft Multimedia
Chui-Wen Chiu