> For the complete documentation index, see [llms.txt](https://www.pinvoke.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.pinvoke.dev/windows-programming/image_thunk_data64.md).

# IMAGE\_THUNK\_DATA64

```csharp
public struct IMAGE_THUNK_DATA64
{
    public Anonymous Union;

    [StructLayout(LayoutKind.Explicit)]
    public struct Anonymous
    {
        [FieldOffset(0)]
        public ulong ForwarderString;

        [FieldOffset(0)]
        public ulong Function;

        [FieldOffset(0)]
        public ulong Ordinal;

        [FieldOffset(0)]
        public ulong AddressOfData;
    }
}
```