[求助]：关于SendMessage函数的应用

xinxiande

请教大侠门用acedCommand(RTSTR, "boundary",RTSTR, "A", RTSTR, "O",RTSTR, "R",RTSTR, "B",RTSTR, "E",RTSTR, "",0);表示的boundary,通过选择点得到相应的区域命令,转换成sendmessage
CString cmd (_T("boundary\n")) ;
        COPYDATASTRUCT cmdMsg ;
        cmdMsg.dwData =(DWORD)1 ;
        cmdMsg.cbData =(DWORD)_tcslen(cmd) + 1 ;
        cmdMsg.lpData =cmd.GetBuffer (cmd.GetLength () + 1) ;
        ::SendMessage (acedGetAcadFrame ()->m_hWnd, WM_COPYDATA, NULL, (LPARAM)&cmdMsg);
里面的cmd该怎么写啊,还有后面所要用到的internal point的内部点坐标怎么给boundary啊,用acedCommand(RTPOINT,pnt,""); 可以方便的给出,但是由于acedCommand的限制,不能调用,那我用sendmessage的方式怎么写这个命令呢??
麻烦大家帮帮忙啊,我是束手无策啊!