Error reading character of string - Access violation error C++ - c++

Question

I working with a Kinect v2 related project in C++ while I cannot use Depth Frame (BYTE*) outside the function.
It works for first some minutes I think by luck so.
Then I got errors like:
Error reading characters of string
and Access violation error and no symbols loaded for kinect20.dll at some point of time.
Here is the method I am calling the values.
BYTE* bodyIndex = new BYTE[512*424]; // initialization
HRESULT frameGet(){
//Initialization method if success
hr = pDepthFrame->AccessUnderlyingBuffer(&m_nDepthBufferSize, &bodyIndex); //Kinect dll method
prints(depth[300]); // Prints the value every time
return hr;
}
HRESULT getDepthFrame(){
if frameGet is success
prints(bodyIndex[300]); // throws error reading character of string
return hr;
}
Can anyone please explain how I can access the bodyIndex data everytime.
I didnt get any response when posted the full code so need the logic how c++ works.
If assumption is right the depth data got cleaned up after sometimes by kinectdll so it reflects.
I tried with memcpy the error still there.
Thanks in advance.

Answer 1

According to https://msdn.microsoft.com/en-us/library/microsoft.kinect.kinect.idepthframe.accessunderlyingbuffer.aspx
you don't need to allocate the memory.
Gets a pointer to the depth frame data.
public:
HRESULT AccessUnderlyingBuffer(
UINT *capacity,
UINT16 **buffer
)
buffer Type: UINT16 [out] When this method returns, contains the
pointer to the depth frame data.
If I understand the spec correctly you have always call AccessUnderlyingBuffer() before access to it.