C# Hook窗体自动显示和隐藏类(中望CAD)

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using ZwSoft.ZwCAD.Runtime;
namespace test
{
    public static partial class HookLib
    {
        private static bool isNormal = true;
        private static Size size;
        private static Form Frm = null;
        private static WindowHookProc callBackFunc = null;
        // For AutoCAD
        // On previous versions, import from acad.exe (instead accore.dll)
        //[DllImport("accore.dll",
        //    CharSet = CharSet.Unicode,
        //    CallingConvention = CallingConvention.Cdecl,
        //    EntryPoint = "?acedRegisterFilterWinMsg@@YA_NQ6A_NPEAUtagMSG@@@Z@Z")]
        //private static extern int acedRegisterFilterWinMsg(WindowHookProc callBackFunc);
        // For AutoCAD
        // On previous versions, import from acad.exe (instead accore.dll)
        //[DllImport("accore.dll",
        //    CharSet = CharSet.Unicode,
        //    CallingConvention = CallingConvention.Cdecl,
        //    EntryPoint = "?acedRemoveFilterWinMsg@@YA_NQ6A_NPEAUtagMSG@@@Z@Z")]
        //private static extern int acedRemoveFilterWinMsg(WindowHookProc callBackFunc);
        // For ZWCAD 2014
        // On previous versions, import from ZWCAD.exe
        [DllImport("ZWCAD.exe",
          CharSet = CharSet.Unicode,
          CallingConvention = CallingConvention.Cdecl,
          EntryPoint = "?zcedRegisterFilterWinMsg@@YAHQ6AHPAUtagMSG@@@Z@Z")]
        private static extern int acedRegisterFilterWinMsg(WindowHookProc callBackFunc);
        // For ZWCAD 2014
        // On previous versions, import from ZWCAD.exe
        [DllImport("ZWCAD.exe",
          CharSet = CharSet.Unicode,
          CallingConvention = CallingConvention.Cdecl,
          EntryPoint = "?zcedRemoveFilterWinMsg@@YAHQ6AHPAUtagMSG@@@Z@Z")]
        private static extern int acedRemoveFilterWinMsg(WindowHookProc callBackFunc);
        // hook message filter callback function
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate int WindowHookProc(ref Message msg);
        private static int WindowsHook(ref Message msg)
        {
            // check the msg struct for whatever we want, 
            // like keys, paint messages etc
            if (msg.Msg == 0x200)
            {
                if (Frm != null && !Frm.IsDisposed)
                {   // do something
                    Frm.Text = "移动" + Cursor.Position.X.ToString() + "," + Cursor.Position.Y.ToString();
                    if (Cursor.Position.X < Frm.Location.X || Cursor.Position.X > Frm.Location.X + Frm.Size.Width || Cursor.Position.Y < Frm.Location.Y || Cursor.Position.Y > Frm.Location.Y + Frm.Size.Height)
                    {
                        if (isNormal)
                        {
                            Frm.ClientSize = new Size(size.Width, 20);
                            isNormal = false;
                        }
                    }
                    else if (!isNormal)
                    {
                        Frm.ClientSize = size;
                        isNormal = true;
                    }
                }
            }
            return 0;
        }
        //[CommandMethod("RegisterHook")]
        public static void CmdRegisterHook()
        {
            if (callBackFunc == null)
            {
                callBackFunc = new WindowHookProc(WindowsHook);
                acedRegisterFilterWinMsg(callBackFunc);
            }
        }
        //[CommandMethod("RmoveHook")]
        public static void CmdRmoveHook()
        {
            if (callBackFunc != null)
            {
                acedRemoveFilterWinMsg(callBackFunc);
                callBackFunc = null;
            }
        }
        public static void ShowForm(string str)
        {
            if (Frm == null || Frm.IsDisposed)
            {
                Assembly assembly = Assembly.GetExecutingAssembly();
                Frm = assembly.CreateInstance($"{MethodBase.GetCurrentMethod().DeclaringType.Namespace}.{str}") as Form;
                size = new Size(400, 400);
                ZwSoft.ZwCAD.ApplicationServices.Application.ShowModelessDialog(Frm);
                CmdRegisterHook();
            }
            else Frm.Show();
        }
        //public static void ShowForm(string str)
        //{
        //    if (Frm == null || Frm.IsDisposed)
        //    {
        //        Assembly tempAssembly = Assembly.GetExecutingAssembly();
        //        Type t = tempAssembly.GetType(str);
        //        object[] args = null;
        //        Frm = Activator.CreateInstance(t, args) as Form;
        //        //size = new Size(400, 400);
        //        size = Frm.Size;
        //        ZwSoft.ZwCAD.ApplicationServices.Application.ShowModelessDialog(Frm);
        //        CmdRegisterHook();
        //    }
        //    else Frm.Show();
        //}
    }
}