static extern Int32 mixerGetLineInfo(IntPtr hmxobj,

Shared Function mixerGetLineInfo(<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef pmxl As MIXERLINE, ByVal fdwInfo As MixerFlags) As MMRESULT

private static extern Int32 mixerGetLineInfo(IntPtr hmxobj, ref MIXERLINE pmxl, uint fdwInfo);

public static Int32 mixerGetLineInfo(IntPtr hmxobj, ref MIXERLINE pmxl, MIXER_OBJECTF fdwInfo, MIXER_GETLINEINFOF fieldToFollow)

     return mixerGetLineInfo(hmxobj, ref pmxl, flags);