[求助]：IAcadPlot的使用

cndgz

同过以下代码实现了dwg输出dwf文件。但是我如何通过程序设置打印区域呢

        AutoCAD::IAcadApplication *IApp;
        AutoCAD::IAcadDocument *IDoc;
        AutoCAD::IAcadPlot *IPlot ;
        AutoCAD::IAcadLayouts *ILayouts;
          CString result ;

HRESULT hr = NOERROR;
CLSID clsid;
LPUNKNOWN pUnk = NULL;
LPDISPATCH pAcadDisp = NULL;
CoInitialize(NULL);
hr = ::CLSIDFromProgID(L"AutoCAD.Application",&clsid);
if (FAILED(hr))
{
  MessageBox("2","2",0) ;
return;
}
if(::GetActiveObject(clsid, NULL, &pUnk) != S_OK)
{
  MessageBox("3","3",0) ;
return;
}
hr = pUnk->QueryInterface(IID_IDispatch, (LPVOID*) &pAcadDisp);
pUnk->Release();
if (FAILED(hr))
return;
//利用获得的IUnknown 接口获得AutoCAD 应用程序对象。同时确保AutoCAD程序可见。代码如下：
hr = pAcadDisp->QueryInterface(AutoCAD::IID_IAcadApplication,(void**)&IApp);
pAcadDisp->Release();
if (FAILED(hr))
{
  MessageBox("","",0) ;
return;
}

IApp->put_Visible(true);

//MessageBox()
//从AutoCAD应用程序接口可以获得菜单条和菜单组集合。
       
        // TODO: Add extra validation here
        TRY
{
IApp->get_ActiveDocument(&IDoc) ;
IDoc->get_Plot(&IPlot) ;
IDoc->get_Layouts(&ILayouts) ;
//IAcadLayout *ILayout ;

_bstr_t tt = "c:\\wlj4.dwf" ;
_variant_t str("PublishToWeb DWF.pc3") ;
VARIANT_BOOL bt = FALSE ;
if (FAILED(IPlot->PlotToFile(tt,str,&bt)))
{
  MessageBox("fail","",0) ;
}
  MessageBox("success","",0) ;
//IApp->AttachDispatch(acedGetAcadWinApp()->GetIDispatch(TRUE)) ;

//IDoc.AttachDispatch(IApp->get_ActiveDocument()) ;
//AutoCAD::IAcadPlot IPlot(IDoc.get_Plot());
//ariant_t str("jxxl.pc3");
//ariant_t bc(0) ;
//TR strfile;
//rcpy(strfile,"c:\\tt2.dwf") ;
//lot->PlotToFile(strfile, str,bc);
}
CATCH(COleDispatchException,e)
{
e->ReportError();
e->Delete();
}
END_CATCH;