Marshal C++ struct array into C#

#define MAXCHARS 15

typedef struct
{
    char data[MAXCHARS];
    int prob[MAXCHARS];
} LPRData;

void GetData(LPRData *data);

LPRData *Results;
Results = (LPRData *)malloc(MAXRESULTS*sizeof(LPRData));
GetData( Results );

public struct LPRData
{

    /// char[15]
    [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 15)]
    public string data;

    /// int[15]
    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 15)]
    public int[] prob;
}

GetData(LPRData[] data);

[StructLayout(LayoutKind.Sequential, Size=TotalBytesInStruct),Serializable]
public struct LPRData
{
/// char[15]
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 15)]
public string data;

/// int[15]
[MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 15)]
public int[] prob;
}

static extern void GetData([Out] out IntPtr ptr);

LPRData[] GetData()
{
    IntPtr value;
    LPRData[] array = new LPRData[3];
    GetData(out value);
    for (int i = 0; i < array.Length; i++)
    {
        array[i] = Marshal.PtrToStructure(value, typeof(LPRData));
        value += value.ToInt32() + Marshal.SizeOf(typeof(LPRData));
    }
    return array;
}