Dll error return pointer from openni - pointers

Question

i was trying to write a plugin for return RGB image stream from ASUS Xtion PRO LIVE using openni.
So in my Dll program i implement getdata() function of VideoFrameRef class to return pointer from image data. when i call this function from my test program it throws an exception.
hear is my dll code
void* MyRgbStrem::GetStream()
{
Device device;
VideoStream color;
VideoFrameRef vframeRef;
VideoMode vmode;
Status status = STATUS_OK;
status = openni::OpenNI::initialize ();
status = device.open(openni::ANY_DEVICE);
status = color.create (device, SENSOR_COLOR);
status = color.start();
while (true)
{
if (device.getSensorInfo(SENSOR_COLOR) != NULL)
{
status = color. readFrame(&vframeRef);
if (vframeRef.isValid())
{
return ( uint16_t*) vframeRef.getData();
}
}
}
}
and in the header file i declar class MyRgbStrem
namespace Rgbstream
{
class MyRgbStrem
{
public:
static __declspec(dllexport) void* GetStream();
};
}
in my test program i use opencv for image processing and to get frame width, height and size i declae few more functions in dll program and call them in test application
this is the program i use to call dll
{
Mat rgb,bgr;
int height, width, size;
height = Rgbstream::MyRgbStrem::GetFrameSize_H();
width = Rgbstream::MyRgbStrem::GetFrameSize_W();
size = Rgbstream::MyRgbStrem::getSizeOfData();
bgr.create ( height,width, CV_8UC3);
rgb.create (height,width, CV_8UC3);
while (true)
{
const void* imgbuff = Rgbstream::MyRgbStrem::GetStream();
memcpy (bgr.data, imgbuff, size );
cvtColor(rgb,bgr, CV_RGB2BGR);
namedWindow ("Color Video",CV_WINDOW_AUTOSIZE);
imshow ("Color Video", bgr);
char key = waitKey (10);
if (key == 27) break;
}
return 0;
}
when i run this program it throws an exception like this
Unhandled exception at 0x0F97E89A (msvcr110d.dll) in CallRgbStream.exe: 0xC0000005: Access violation reading location 0x00268000.
The program '[9544] CallRgbStream.exe' has exited with code 0 (0x0).
any help is appreciate. thanks