Finding the related user ID for each hand ID

When dealing with nite::HandTracker and nite::HandData, there is no way to find out which hand belongs to which user. Actually, there is no direct way of finding this out in NiTE at all. In this recipe, we will show you how it's possible to use nite::UserTracker and nite::UserMap along with nite::HandTracker and nite::HandData to determine the user ID of each hand.

Getting ready

Create a project in Visual Studio and prepare it for working with OpenNI and NiTE using the Create a project in Visual Studio 2010 recipe in Chapter 2, OpenNI and C++.

How to do it...

1. Copy ReadLastCharOfLine() and HandleStatus() from the first recipe of this chapter to the top of your source code (just below the #include lines).

2. Then, locate the following line:

   int _tmain(int argc, _TCHAR* argv[])
   {

3. Add the following code inside the preceding line:

     nite::Status status = nite::STATUS_OK;
     status = nite::NiTE::initialize();
     if (!HandleStatus(status)) return 1;
   
     printf("Creating...