public static extern NotificationProxyError np_set_notify_callback(NotificationProxyClientHandle client, NotificationProxyNotifyCallBack notifyCallBack, System.IntPtr userdata);
/// <summary>
/// This function allows an application to define a callback function that will
/// be called when a notification has been received.
/// It will start a thread that polls for notifications and calls the callback
/// function if a notification has been received.
/// In case of an error condition when polling for notifications - e.g. device
/// disconnect - the thread will call the callback function with an empty
/// notification "" and terminate itself.
/// </summary>
/// <param name="client">
/// the NP client
/// </param>
/// <param name="notify_cb">
/// pointer to a callback function or NULL to de-register a
/// previously set callback function.
/// </param>
/// <param name="user_data">
/// Pointer that will be passed to the callback function as
/// user data. If notify_cb is NULL, this parameter is ignored.
/// </param>
/// <returns>
/// NP_E_SUCCESS when the callback was successfully registered,
/// NP_E_INVALID_ARG when client is NULL, or NP_E_UNKNOWN_ERROR when
/// the callback thread could no be created.
/// </returns>
/// <remarks>
/// Only one callback function can be registered at the same time;
/// any previously set callback function will be removed automatically.
/// </remarks>
public virtual NotificationProxyError np_set_notify_callback(NotificationProxyClientHandle client, NotificationProxyNotifyCallBack notifyCallBack, System.IntPtr userdata)
{
return(NotificationProxyNativeMethods.np_set_notify_callback(client, notifyCallBack, userdata));
}