How to access data from array of pointers in LoadLibrary? Only the first is accessible

Hi.

I have in issue with LoadLibrary. I have a function that has the following prototype:

    int searchDevice(DeviceData** ptr, unsigned int *size) 
    { 
    *size = 2; 
    (*ptr) = new (std::nothrow) DeviceData[static_cast<int>(*size)](); 
    for (i=0; i<*size; i++) 
    { 
    //update ptr[0 to size-1] 
    } 
    return 0; //successful 
    } 

    struct tagDeviceData 
    { 
    long long int lPortNo; 
    char strSerialNo[9]; 
    };

When I perform the following in MATLAB:

loadlibrary('MyLib', 'MyLib.h') 
pResultArray = libpointer('tagDeviceData'); 
plSize = 0; 
[res, pResult, size] = calllib('MyLib','searchDevice', pResultArray, plSize)

the following is returned:

    res = 0 

pResult= 
  MATLAB struct containing: 
  lPortNo = //value set for index 0 
  strSerialNo = // value set for index 0 

    size = 2

I am able to access the first data (since it is the one in the returned struct) but the 2nd data is not accessible. Is there a way to access the data past the first index?

Thank you