objectARX 自动激活视口简单示意

代码

//声明最后的视口编号数值
//仅根据鼠标位置，获取视口编号，设置当前视口
int g_LastVp=0;
bool filterMouse(MSG *pMsg)
{
	if( pMsg->message == WM_MOUSEMOVE )
	{	
		CPoint cPnt (pMsg->lParam) ;
		int nVp= acedGetWinNum(cPnt.x,cPnt.y);		
		if (nVp!= g_LastVp)
		{
			acedSetCurrentVPort(nVp);
			g_LastVp=nVp;
		}		
	}
	return false;
}

//注册鼠标消息钩子
acedRegisterFilterWinMsg(filterMouse);

//移除鼠标消息钩子
acedRemoveFilterWinMsg(filterMouse);

C#例子cad2019测试

        // For AutoCAD 2013 64 bit
        // On previous versions, import from acad.exe (instead accore.dll)
        //?acedRegisterFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z
        // For AutoCAD 2019 64 bit
        //?acedRegisterFilterWinMsg@@YA_NQ6A_NPEAUtagMSG@@@Z@Z
        [DllImport("accore.dll",
          CharSet = CharSet.Unicode,
          CallingConvention = CallingConvention.Cdecl,
          EntryPoint = "?acedRegisterFilterWinMsg@@YA_NQ6A_NPEAUtagMSG@@@Z@Z")]
        private static extern int acedRegisterFilterWinMsg(
          WindowHookProc callBackFunc);
        [DllImport("accore.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, EntryPoint = "?acedGetWinNum@@YAHHH@Z")]
        private static extern int acedGetWinNum(int x,int y);
        
        [DllImport("accore.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, EntryPoint = "?acedSetCurrentVPort@@YA?AW4ErrorStatus@Acad@@H@Z")]
        private static extern ErrorStatus acedSetCurrentVPort(int x);
        // hook message filter callback function
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]

        public delegate int WindowHookProc(
          ref System.Windows.Forms.Message msg);
        private const int WM_MOUSEMOVE = 0x0200;
        private static int WindowsHook(
          ref System.Windows.Forms.Message msg)
        {
            // check the msg struct for whatever we want, 
            // like keys, paint messages etc
            if (msg.Msg == WM_MOUSEMOVE)
            {
                // do something
                Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
                int x = msg.LParam.ToInt32() & 0xffff;
                int y = (msg.LParam.ToInt32() >> 16);
                var nvp2 = acedGetWinNum(x, y);
                acedSetCurrentVPort(nvp2);                
                //ed.WriteMessage("\n 视口编号 " + nvp2.ToString());                
            }
            return 0;
        }
        private static WindowHookProc callBackFunc = null;
        [CommandMethod("registerHook")]
        public static void CmdRegisterHook()
        {
            callBackFunc = new WindowHookProc(WindowsHook);
            acedRegisterFilterWinMsg(callBackFunc);
        }

截图