/// <summary>
/// Register a callback function to be called when a device is added or removed.
/// </summary>
/// <param name="callback">Callback delegate to be called whenever a device is added or removed</param>
/// <remarks>
/// Passing a NULL function pointer will disable the callback.
/// </remarks>
/// <exception cref="HResultException"></exception>
public void RegisterDeviceCallback(DeviceCallback callback)
{
HResult retVal = registerDeviceCallback(callback, new IntPtr());
if (retVal != HResultException.S_OK)
{
Dictionary <HResult, String> errorsMap = new Dictionary <HResult, String>()
{
{ HResultException.E_HANDLE, "DirectOutput was not initialized." }
};
throw new HResultException(retVal, errorsMap);
}
}
public async Task Handle(UserMessage message, IMessageHandlerContext context)
{
try
{
var listDevices = await _repository.GetListDevaces(message.DevaceSerialNumbers);
var deviceCallbackMessage = new DeviceCallback(listDevices);
await context.Reply(deviceCallbackMessage);
}
catch (Exception e)
{
_logger.LogError(e, e.Message);
throw;
}
await Task.CompletedTask;
}
public static ReturnValues RegisterDeviceCallback(DeviceCallback pfnCallback)
{
return((ReturnValues)DirectOutput_RegisterDeviceCallback(pfnCallback, IntPtr.Zero));
}
static extern IntPtr DirectOutput_RegisterDeviceCallback([MarshalAs(UnmanagedType.FunctionPtr)] DeviceCallback pfnCallback, IntPtr pvParam);