File: Windows\Win32\PInvokeCore.SetClassLong.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
    [DllImport(Libraries.User32)]
    private static extern nint SetClassLongW(HWND hwnd, GET_CLASS_LONG_INDEX nIndex, nint dwNewLong);
 
    [DllImport(Libraries.User32)]
    private static extern nint SetClassLongPtrW(HWND hwnd, GET_CLASS_LONG_INDEX nIndex, nint dwNewLong);
 
    public static nint SetClassLong(HWND hWnd, GET_CLASS_LONG_INDEX nIndex, nint dwNewLong)
         => Environment.Is64BitProcess
           ? SetClassLongPtrW(hWnd, nIndex, dwNewLong)
           : SetClassLongW(hWnd, nIndex, dwNewLong);
}