c# 中调用EnumChildWindow

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c# 中调用windows api函数

//原函数定义BOOL WINAPI EnumChildWindows(  _In_opt_ HWND        hWndParent,  _In_     WNDENUMPROC lpEnumFunc,  _In_     LPARAM      lParam);

//C#定义        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall)]   //BOOL WINAPI EnumChildWindows( _In_opt_ HWND        hWndParent,  _In_     WNDENUMPROC lpEnumFunc,  _In_     LPARAM      lParam);   public static extern int EnumChildWindows(IntPtr hWndParent, EnumWindowsCallBack lpfn, int lParam);  //HWND WINAPI GetParent(        _In_ HWND hWnd);  public extern static IntPtr GetParent(IntPtr hWnd);

一开始认为该函数只返回第一级child节点。处理函数如下：

       //c#调用       public void ReadAllWnd()        {            foreach (WindowBase item in WindowsOpt.Instance.Windows)            {                windowsStack.Push(item);            }            while (windowsStack.Count > 0)            {                WindowBase curOpt = windowsStack.Peek();                Help.DebugWrite(this, "EnumChildWindows... {0}", Help.IntPtrToString(curOpt.HWnd));                int result = Win32Api.EnumChildWindows(curOpt.HWnd, (wPara, lPara) =>                 {                     Help.DebugWrite(this, "Win32Api.EnumChildWindows back hWnd {0}", wPara.ToString());                     WindowBase childWindow = WindowBase.CreateWindow(wPara);                     childWindow.ParentWindow = curOpt;                     curOpt.ChildNodes.Add(childWindow);                     return true;                 }, 0);                windowsStack.Pop();                foreach (WindowBase item in curOpt.ChildNodes)                {                    windowsStack.Push(item);                }            }        }

但在开发中发现，该函数会返回所有子级的所有子节点。因些使用以下代码构建windows树，每次callback需要使用GetParent()得到parent句柄，根据parent句柄找到对应window。

        public void ReadAllChild()        {            Dictionary<IntPtr, WindowBase> dictChildWindows = new Dictionary<IntPtr, WindowBase>();                 foreach (WindowBase RootWindow in WindowsOpt.Instance.Windows)            {                Win32Api.EnumChildWindows(RootWindow.HWnd, (wPara, pPara) =>                 {                     WindowBase childWindow = WindowBase.CreateWindow(wPara);                     dictChildWindows.Add(wPara, childWindow);                     return true;                 }, 0);                foreach (KeyValuePair<IntPtr, WindowBase> item in dictChildWindows)                {                    IntPtr parentHWnd = this.RunApi(() => Win32Api.GetParent(item.Value.HWnd));                    if (dictChildWindows.ContainsKey(parentHWnd))                    {                                                item.Value.ParentWindow = dictChildWindows[parentHWnd];                    }                    else                    {                        item.Value.ParentWindow = Windows.First((w) => { return w.HWnd == parentHWnd; });                    }                    item.Value.ParentWindow.ChildNodes.Add(item.Value);                }                dictChildWindows.Clear();            }        }

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