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public static extern uint waveOutGetDevCaps(IntPtr hwo,ref WAVEOUTCAPS pwoc,uint cbwoc);
VB Signature:
Declare Auto Function waveOutGetDevCaps Lib "winmm.dll" (ByVal uDeviceID as Integer, ByRef lpCaps As WAVEOUTCAPS, _
ByVal uSize As Integer) As Integer
Constants Used:
Public Const C_MAXPNAMELEN As Integer = 32
Public Const WAVE_MAPPER As Integer = -1 'Specifies default device ID
Structures Used:
VB.NET 2005 - Use the following structure: WAVEOUTCAPS
<Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Sequential, CharSet:=Runtime.InteropServices.CharSet.Auto)> _
Public Structure WAVEOUTCAPS
Public wMid As Short
Public wPid As Short
Public vDriverVersion As Integer
<System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst:=32)> _
Public szPname As String
Public dwFormats As Integer
Public wChannels As Short
Public wReserved As Short
Public dwSupport As Integer
End Structure
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
Remember to have the strings marshaled as ByValTStr with size of 32.
Use "Auto" in the Declare statement to have the correct character set selected automatically.
Tips & Tricks:
Please add some!
Sample Code:
Sub ShowDeviceCaps()
Dim i As Integer
Dim wc As New WAVEOUTCAPS
MsgBox("Number of Wave Devices: " & waveOutGetNumDevs(), , "WAVE DEVICES")
For i = 0 To waveOutGetNumDevs() - 1
waveOutGetDevCaps(i, wc, Len(wc))
MsgBox("MID = " & wc.wMid & Chr(13) & "PID = " & wc.wPid & Chr(13) & "Version = " & _
wc.vDriverVersion & Chr(13) & "Name = " & wc.szPname & Chr(13) & "Formats = " & wc.dwFormats & _
Chr(13) & "Channels = " & wc.wChannels, , "Device ID = " & i + 1)
Next i
End Sub
The SetLastError API
1/26/2016 3:27:33 AM - -124.148.167.58
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4/6/2008 7:23:14 AM - anonymous
Click to read this page
4/6/2008 7:23:14 AM - anonymous
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
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