如何检查窗口是否为MDI窗口?

时间:2011-08-19 14:35:40

标签: c# windows interop winforms-interop user32

我想有一些user32.dll调用我可以用来验证窗口是否是MDI窗口,比如使用DefMDIChildProc并查看它是否失败,但我想知道是否有任何限制,或者是否有更好的方法去做这个?检查父母是否足够?

为了简单起见,我最终希望的是一种IsMDI(IntPtr ptr)的呼叫......

思考?建议?

2 个答案:

答案 0 :(得分:4)

我已经弄明白了(在pinvoke.net的帮助下) - 您可以根据扩展的Windows样式找到答案:

        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);

答案 1 :(得分:2)

如果控件位于您自己的.NET应用程序中,Form class具有使用MDI窗口的属性:

Form.IsMdiChild

Form.IsMdiContainer

Form.MdiParent

Form.MdiChildren