Exception in displaying the depth and Rgb Image through OpenNI in C++ - c++

Question

I am new to openNI and Kinect as a beginner I tried implementing OpenNI SimpleViewer through the Tutorial in OpenNI.org at this link : http://openni.org/docs2/Tutorial/smpl_simple_view.html
I have implemented the code as described in this tutorial but I am still facing problem as The program is throwing exception and it is not showing any output.
I have linked all the libraries and installed the kinect properly. I have also included the OpenCV library with openNI.
Here is My C++ Code that I have Implemented :
int main()
{
rc = context.InitFromXmlFile(XML_PATH,&errors);
if(rc == XN_STATUS_NO_NODE_PRESENT)
{
XnChar strError[1024];
errors.ToString(strError,1024);
printf("%s\n",strError);
return(rc);
}
else if(rc != XN_STATUS_OK)
{
printf("Open failed : %s\n", xnGetStatusString(rc));
return(rc);
}
rc = context.FindExistingNode(XN_NODE_TYPE_DEPTH,depth);
if(rc != XN_STATUS_OK)
{
printf("No Depth Node Found. Check XML!\n");
return -1;
}
depth.GetMetaData(depthMD);
image.GetMetaData(imageMD);
if(imageMD.FullXRes() != depthMD.FullXRes() || imageMD.FullYRes() != depthMD.FullYRes())
{
printf("The device depth and image resolution must be equal\n");
return -1;
}
if(imageMD.PixelFormat() != XN_PIXEL_FORMAT_RGB24)
{
printf("The Device Image Format must be RGB24\n");
return -1;
}
unsigned short textMapX = (((unsigned short)(depthMD.FullXRes() - 1)/512) + 1 * 512);
unsigned short textMapY = (((unsigned short)(depthMD.FullYRes() - 1)/512) + 1 * 512);
XnRGB24Pixel* pTextMap = (XnRGB24Pixel*) malloc(textMapX * textMapY * sizeof(XnRGB24Pixel));
rc = context.WaitOneUpdateAll(depth);
depth.GetMetaData(depthMD);
image.GetMetaData(imageMD);
const XnDepthPixel* pDepth = depthMD.Data();
const XnUInt8* pImage = imageMD.Data();
unsigned int imageScale = GL_WIN_SIZE_X/depthMD.FullXRes();
xnOSMemSet(depthHist,0,MAX * sizeof(float));
unsigned int numberOfPoints = 0;
for(XnUInt y = 0; y < depthMD.YRes(); ++ y)
{
for(XnUInt x = 0; x < depthMD.XRes(); ++x, ++pDepth);
{
if(*pDepth != 0)
{
depthHist[*pDepth]++;
numberOfPoints++;
}
}
}
for(int index = 1; index < MAX; index++)
{
depthHist[index] += depthHist[index - 1];
}
if(numberOfPoints)
{
for(int index = 1; index < MAX; index++)
{
depthHist[index] = (unsigned int)(256 * (1.0f - (depthHist[index]/numberOfPoints)));
}
}
return 0;
}
I am also facing problem understanding the later part of the code.