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功能函数：NXOpen C++方式分析求出得到一个Face面的面积

使用方法：传入一个Face* 面，返回这个面的面积值

函数代码：

double GetFaceArea(Face *face)
{
    Session *theSession = Session::GetSession();
    Part *workPart(theSession->Parts()->Work());
    Part *displayPart(theSession->Parts()->Display());
    
    NXObject *nullNXObject(NULL);
    NXOpen::MeasureFaceBuilder *measureFaceBuilder1;
    measureFaceBuilder1 = workPart->MeasureManager()->CreateMeasureFaceBuilder(nullNXObject);
    std::vector<IParameterizedSurface *> objects1(1);
    objects1[0] = face;

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     measureFaceBuilder1->FaceObjects()->Clear();
    measureFaceBuilder1->Destroy();
    theSession->CleanUpFacetedFacesAndEdges();
    double areaValue = measureFaces1->Area();

    return areaValue;
}