如何检查窗口是否是 MDI 窗口？

发布于 2024-11-30 20:02:51 字数 181 浏览 1 评论 0原文

我想象有一些 user32.dll 调用可以用来验证窗口是否是 MDI 窗口，例如使用 DefMDIChildProc 并查看它是否失败，但我想知道这是否有任何限制，或者是否有更好的方法来执行此操作？检查父母是否足够？

为了简单起见，我最终希望的是 IsMDI(IntPtr ptr) 类型的调用...

想法？建议？

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み青杉依旧 2024-12-07 20:02:51

我已经弄清楚了（在 pinvoke.net 的帮助下） - 您可以根据扩展 Windows 样式找到：

        public static bool IsMDI(IntPtr hwnd)
        {
            WINDOWINFO info = new WINDOWINFO();
            info.cbSize = (uint)Marshal.SizeOf(info);
            GetWindowInfo(hwnd, ref info);
            //0x00000040L is the style for WS_EX_MDICHILD
            return (info.dwExStyle & 0x00000040L)==1;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct WINDOWINFO
        {
            public uint cbSize;
            public RECT rcWindow;
            public RECT rcClient;
            public uint dwStyle;
            public uint dwExStyle;
            public uint dwWindowStatus;
            public uint cxWindowBorders;
            public uint cyWindowBorders;
            public ushort atomWindowType;
            public ushort wCreatorVersion;

            public WINDOWINFO(Boolean? filler)
                : this()   // Allows automatic initialization of "cbSize" with "new WINDOWINFO(null/true/false)".
            {
                cbSize = (UInt32)(Marshal.SizeOf(typeof(WINDOWINFO)));
            }

        }

        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool GetWindowInfo(IntPtr hwnd, ref WINDOWINFO pwi);

I've figured it out (with the help of pinvoke.net) - you can find out based on the Extended Windows Styles:

        public static bool IsMDI(IntPtr hwnd)
        {
            WINDOWINFO info = new WINDOWINFO();
            info.cbSize = (uint)Marshal.SizeOf(info);
            GetWindowInfo(hwnd, ref info);
            //0x00000040L is the style for WS_EX_MDICHILD
            return (info.dwExStyle & 0x00000040L)==1;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct WINDOWINFO
        {
            public uint cbSize;
            public RECT rcWindow;
            public RECT rcClient;
            public uint dwStyle;
            public uint dwExStyle;
            public uint dwWindowStatus;
            public uint cxWindowBorders;
            public uint cyWindowBorders;
            public ushort atomWindowType;
            public ushort wCreatorVersion;

            public WINDOWINFO(Boolean? filler)
                : this()   // Allows automatic initialization of "cbSize" with "new WINDOWINFO(null/true/false)".
            {
                cbSize = (UInt32)(Marshal.SizeOf(typeof(WINDOWINFO)));
            }

        }

        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool GetWindowInfo(IntPtr hwnd, ref WINDOWINFO pwi);

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