Work with IFC Models and Header Sections

When you have a valid instance of the OdIfcFile class, you can manage the header section and model objects of the IFC database.

To get access to the IFC database header section:

Retrieve the repository object:


OdDAI::RepositoryPtr  pRepository = pDb->getRepository();

Get the header section object from the repository object and check whether it is valid:


OdDAI::OdHeaderSectionPtr headerSection = pRepository->getHeaderSection();

if (headerSection.isNull())
{
  ODA_ASSERT(0 && "Header is not valid.");
  throw OdError(eNullEntityPointer);
}

Initialize the header section:
```
headerSection->initialize();
        
```

Add the IFC file description to the header section:


OdDAI::OdFileDescriptionAuto* fileDescription = getHeaderFromSection<OdDAI::OdFileDescriptionAuto, OdDAI::kFileDescription>(headerSection);
OdArray<OdAnsiString> descriptionCollection;
descriptionCollection.push_back("ViewDefinition [CoordinationView]");
fileDescription->setDescriptionAggr(descriptionCollection);
fileDescription->setImplementationLevel("2;1");

Add the IFC filename and its timestamp:


OdDAI::OdFileNameAuto* fileName = getHeaderFromSection<OdDAI::OdFileNameAuto, OdDAI::kFileName>(headerSection);
fileName->setName("TestFile.ifc");
fileName->setTimeStamp("2019-02-23T12:17:26");

Define the schema of the IFC file:


OdDAI::OdFileSchemaAuto* fileSchema = getHeaderFromSection<OdDAI::OdFileSchemaAuto, OdDAI::kFileSchema>(headerSection);
OdArray<OdAnsiString> schemCollection;
schemCollection.push_back("IFC2X3");
fileSchema->setSchemaIdentifiersAggr(schemCollection);

To proceed with any operation for an IFC model, you need a smart pointer to its object within an IFC database. To get it, use a model provider object from the OdDAI interface:


OdDAI::Utils::ModelProviderRO  modelProvider(pDb->getRepository());
OdIfc::OdIfcModelPtr model = modelProvider.model<OdIfc::OdIfcModel>();

if (model.isNull() || model->underlyingSchemaName().find("IFC2X3") != 0)
{
  ODA_ASSERT(0 && "Model is not valid.");
  throw OdError(eNullEntityPointer);
}

Using the smart pointer returned by the model() method of the repository object, you can work with the IFC model using the OdDAI interface.

See Also