File: Windows\Win32\PInvokeCore.GetClassLong.cs
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Project: src\src\System.Private.Windows.Core\src\System.Private.Windows.Core.csproj (System.Private.Windows.Core)
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Runtime.InteropServices;
 
namespace Windows.Win32;
 
internal static partial class PInvokeCore
{
    // We only ever call this on 32 bit so IntPtr is correct
    // https://msdn.microsoft.com/library/windows/desktop/ms633580.aspx
    [DllImport(Libraries.User32, SetLastError = true)]
    private static extern nint GetClassLongW(HWND hWnd, GET_CLASS_LONG_INDEX nIndex);
 
    // https://msdn.microsoft.com/library/windows/desktop/ms633581.aspx
    [DllImport(Libraries.User32, SetLastError = true)]
    private static extern nint GetClassLongPtrW(HWND hWnd, GET_CLASS_LONG_INDEX nIndex);
 
    public static IntPtr GetClassLong(HWND hWnd, GET_CLASS_LONG_INDEX nIndex)
        => Environment.Is64BitProcess
           ? GetClassLongPtrW(hWnd, nIndex)
           : GetClassLongW(hWnd, nIndex);
}