c++调用com口操作autocad

#include "stdafx.h"
#include <atlcomcli.h>
#import  "D:\C++test\FirstCom\Release\FirstCom.dll" no_namespace
#import  "C:\Program Files\Common Files\Autodesk Shared\acax18chs.tlb" no_namespace


int _tmain()
{
    HRESULT hr;
    CoInitialize(NULL);
    CLSID clsid;
    hr=CLSIDFromString(OLESTR("AutoCAD.Application.18"), &clsid);
    CComPtr<IAcadApplication> pFir;
    
    pFir.CoCreateInstance(clsid);
//     pFir->Visible = TRUE;
//     pFir->WindowState = acMax;
//     HWND hw = (HWND)(pFir->HWND);
//     ::SetForegroundWindow(hw);

    IAcadDocumentPtr idoc;
    hr = pFir->get_ActiveDocument(&idoc);
    IAcadModelSpacePtr iMod;
    hr = idoc->get_ModelSpace(&iMod);

    double ptV[3];
    ptV[0] = 10;
    ptV[1] = 10;
    ptV[2] = 0;

    VARIANT  insertPT;
    VariantInit(&insertPT);
    insertPT.vt = VT_ARRAY | VT_R8; //类型（数组，双精度型）
    SAFEARRAYBOUND rgsabound[1];
    rgsabound[0].cElements = 3;    //数组所含元素数
    rgsabound[0].lLbound = 0;   //数组上界

    insertPT.parray = SafeArrayCreate(VT_R8, 1, rgsabound);  //创立一维数组
    SafeArrayLock(insertPT.parray);

    insertPT.parray->pvData = ptV;
    SafeArrayUnlock(insertPT.parray);

    hr = iMod->AddCircle(insertPT, 10);
    hr = pFir->ZoomExtents();


    CoUninitialize();
    return 0;
}