```csharp [DllImport("user32.dll")] public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId); [DllImport("user32.Dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool EnumChildWindows(IntPtr parentHandle, Win32Callback callback, IntPtr lParam); public delegate bool Win32Callback(IntPtr hwnd, IntPtr lParam); List GetRootWindowsOfProcess(int pid) { List rootWindows = GetChildWindows(IntPtr.Zero); List dsProcRootWindows = new List(); foreach (IntPtr hWnd in rootWindows) { uint lpdwProcessId; GetWindowThreadProcessId(hWnd, out lpdwProcessId); if (lpdwProcessId == pid) dsProcRootWindows.Add(hWnd); } return dsProcRootWindows; } public static List GetChildWindows(IntPtr parent) { List result = new List(); GCHandle listHandle = GCHandle.Alloc(result); try { Win32Callback childProc = new Win32Callback(EnumWindow); EnumChildWindows(parent, childProc, GCHandle.ToIntPtr(listHandle)); } finally { if (listHandle.IsAllocated) listHandle.Free(); } return result; } private static bool EnumWindow(IntPtr handle, IntPtr pointer) { GCHandle gch = GCHandle.FromIntPtr(pointer); List list = gch.Target as List; if (list == null) { throw new InvalidCastException("GCHandle Target could not be cast as List"); } list.Add(handle); return true; } ```

❔ problem changing the opacity of desktop icons via windows api

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