SetChannelVolume method
Implementation
int SetChannelVolume(int dwIndex, double fLevel) => ptr.ref.vtable
.elementAt(4)
.cast<
Pointer<
NativeFunction<
Int32 Function(Pointer, Uint32 dwIndex, Float fLevel)>>>()
.value
.asFunction<int Function(Pointer, int dwIndex, double fLevel)>()(
ptr.ref.lpVtbl, dwIndex, fLevel);