c# - Getting Array of struct from IntPtr

Question

I have some struct like this

struct MyStruct
{
    public int field1;
    public int field2;
    public int field3;
}

and I have pointer to array of this struct. So, I need to get array from this pointer. I'm tried to using Marshal.PtrToStructure, but i had memory reading error. This is my methode:

public MyStruct[] GetArrayOfStruct(IntPtr pointerToStruct, int length)
{
    var sizeInBytes = Marshal.SizeOf(typeof(TCnt));
    MyStruct[] output = new MyStruct[length];

    for (int i = 0; i < length; i++)
    {
        IntPtr p = new IntPtr((pointerToStruct.ToInt32() + i * sizeInBytes));

        output[i] = (MyStruct)System.Runtime.InteropServices.Marshal.PtrToStructure(p, typeof(MyStruct));
    }

    return output;
}

So, what am i doing wrong ?

Answer 1

This function worked for me, assuming that the size of the struct is fixed:

public static void MarshalUnmananagedArray2Struct<T>(IntPtr unmanagedArray, int length, out T[] mangagedArray)
{
    var size = Marshal.SizeOf(typeof(T));
    mangagedArray = new T[length];

    for (int i = 0; i < length; i++)
    {
        IntPtr ins = new IntPtr(unmanagedArray.ToInt64() + i * size);
        mangagedArray[i] = Marshal.PtrToStructure<T>(ins);
    }
 }