最近在做OGRMultiPolygon相关开发的时候，遇到了新建OGRMultiPolygon对象无法正确释放的问题，后来找到示例代码，发现该对象不能直接new，以下为错误代码和正确代码的示例。
/*********error code********* OGRMultiPolygon* pmp = new OGRMultiPolygon; delete pmp; pmp = nullptr; *********error code*********/ //蓝色多边形 char* szWKT_1 = "POLYGON ((113.885 22.6815, 113.9425 22.6585, 113.91 22.7, 113.885 22.6815))"; //橙色多边形 char* szWKT_2 = "POLYGON ((113.91 22.7, 113.9425 22.6585, 113.9675 22.689, 113.91 22.7))"; OGRGeometry* pGeom_1 = NULL; OGRGeometry* pGeom_2 = NULL; OGRGeometryFactory::createFromWkt(&szWKT_1, NULL, &pGeom_1); OGRGeometryFactory::createFromWkt(&szWKT_2, NULL, &pGeom_2); OGRMultiPolygon* pMultiPolygon = (OGRMultiPolygon*)OGRGeometryFactory::createGeometry(wkbMultiPolygon); pMultiPolygon->addGeometryDirectly(pGeom_1); pMultiPolygon->addGeometryDirectly(pGeom_2); //用Buffer替代Union，缓冲距离设置为0 //pUnion为紫色多边形 OGRGeometry* pUnion = pMultiPolygon->Buffer(0); delete pMultiPolygon; pMultiPolygon = nullptr; return 0;
标签：范例,szWKT,pmp,pGeom,OGRMultiPolygon,pMultiPolygon,使用,NULL From： https://www.cnblogs.com/autumoonchina/p/17202296.html