NaviTrack Tutorial:Integrating:Callback Module - Revision history

Tokuda: /* Sending coordinate data */

2007-06-14T21:34:10Z

Sending coordinate data

Tokuda at 21:33, 14 June 2007

2007-06-14T21:33:29Z

Tokuda: /* Overview of CallbackModule */

2007-06-14T21:22:19Z

Overview of CallbackModule

Tokuda at 21:06, 14 June 2007

2007-06-14T21:06:57Z

New page

=Overview of CallbackModule=
In the previous pages, we have implemented data transfer using NaviTrack into our own programs.
The problem here is that they need to poll MyTutorialModule frequently to check
if new data have arrived. This couldn't be a serious problem in case of seding small piece of data such as
coordinate values, but might cause a waste of CPU time when the data is large.

We can do the almost same thing by using CallbackModule instead of polling.
This module offers callback mechanism to process recieved data on its arrival.
All we need to do is to define a callback function to process recieved data, and register it to CallbackModule.
Once a callback function has been registered, it is invoked every after events arrive at a corresponding node
in NaviTrack data flow, which is defined in a configulation XML file.

@@ Line 14: / Line 14: @@
 =Sending coordinate data=
-See lxxxxx.
+See [[NaviTrack_Tutorial:Integrating:Passing_coordinates_data]].
 =Receiving coordinate data=

@@ Line 20: / Line 20: @@
 To receive and process the coordinate data, create a callback function and register it to CallbackModule.
-===Register callback function and start context of NaviTrack===
+==Register callback function and start context of NaviTrack==
 In main() of pullpos_cbm.cxx.
@@ Line 31: / Line 31: @@
    context.runAtRate(1000.0/(double)interval);
-===Define callback function itself===
+==Define callback function itself==
    void callbackFunc(Node&, Event &event, void *)
@@ Line 67: / Line 67: @@
-===Configure XML file===
+==Configure XML file==
    <OpenTracker>
@@ Line 81: / Line 83: @@
    </OpenTracker>
 Go back to [[NaviTrack_Tutorial:Integrating_into_your_application]].

@@ Line 8: / Line 8: @@
 This module offers callback mechanism to process recieved data on its arrival.
 All we need to do is to define a callback function to process recieved data, and register it to CallbackModule.
 Once a callback function has been registered, it is invoked every after events arrive at a corresponding node
 in NaviTrack data flow,  which is defined in a configulation XML file.