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标题: 谁做过 CAA_V5_For_CATIA_Foundations_Exercises 这个例子，请指导一下，谢谢。 [打印本页]

作者: powermill 时间: 2011-8-19 09:00
标题: 谁做过 CAA_V5_For_CATIA_Foundations_Exercises 这个例子，请指导一下，谢谢。
我在做 exercises1的第二步时，CreatePoint这个函数怎样使用，我不会用，总是出错，请指导，谢谢。
相关的原程序如下：

CAAOmtPoint::CAAOmtPoint(double iX, double iY):
CATBaseUnknown(),
_x(iX),
_y(iY)
{
}

  HRESULT CAAOmtModelFactory::CreatePoint(double    iX,                                        double    iY,
                                    CAAIPoint** opiNewCAAIPoint)
{
HRESULT rc = E_FAIL;
  *opiNewCAAIPoint = NULL;

// Create the point implementation
CAAOmtPoint* pNewPoint = new CAAOmtPoint(iX, iY);
if(!pNewPoint) {
cout << "CreatePoint(): could not create a CAAOmtPoint" << endl << flush;
return NULL;
}

// Get a CATIPoint on pNewPoint
rc = pNewPoint->QueryInterface(IID_CAAIPoint,
                                 (void**) opiNewCAAIPoint);
if(FAILED(rc)) {
cout << "CreatePoint(): could not obtaine CAAIPoint interface" << endl << flush;
return E_FAIL;
}
pNewPoint->Release();
pNewPoint=NULL;

cout << "I Got a Point...." << endl << flush;

return S_OK;

}

我在使用时，是这样的：

CAAOmtModelFactory * pCreatePointFactory;
pCreatePointFactory =(CAAOmtModelFactory *) new CAAOmtModelFactory();

//  2. Use factory to create a point

CAAIPoint** opiNewPoint=NULL;

rc = pCreatePointFactory -> CreatePoint(20,20,？？？);

CreatePoint函数的第三个变量是返回值，我应该怎样初始化？

作者: powermill 时间: 2011-9-6 08:46
现在清楚了，是这样使用：
CAAIPoint* opiNewPoint=NULL;

rc = pCreatePointFactory -> CreatePoint(20,20,&opiNewPoin);

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