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// 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.CompilerServices;
using System.Runtime.InteropServices;
namespace Windows.Win32;
internal static partial class PInvokeCore
{
public delegate BOOL EnumThreadWindowsCallback(HWND hWnd);
/// <summary>
/// Enumerates all nonchild windows in the current thread.
/// </summary>
public static unsafe BOOL EnumCurrentThreadWindows(EnumThreadWindowsCallback callback)
{
// We pass a function pointer to the native function and supply the callback as
// reference data, so that the CLR doesn't need to generate a native code block for
// each callback delegate instance (for storing the closure pointer).
GCHandle gcHandle = GCHandle.Alloc(callback);
try
{
return EnumThreadWindows(GetCurrentThreadId(), &HandleEnumThreadWindowsNativeCallback, (LPARAM)(nint)gcHandle);
}
finally
{
gcHandle.Free();
}
}
[UnmanagedCallersOnly(CallConvs = [typeof(CallConvStdcall)])]
private static BOOL HandleEnumThreadWindowsNativeCallback(HWND hWnd, LPARAM lParam)
{
return ((EnumThreadWindowsCallback)((GCHandle)(nint)lParam).Target!)(hWnd);
}
}
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