IFC Print Hierarchy using IfcOpenShell

main.cpp

#include <string>
#include <iostream>
#include <fstream>

// ifcOpenShell
#ifdef USE_IFC4
#include <ifcparse/Ifc4.h>
#else
#include <ifcparse/Ifc2x3.h>
#endif

#include <ifcparse/IfcBaseClass.h>
#include <ifcparse/IfcHierarchyHelper.h>

using namespace IfcSchema;

// Recursive print function
void PrintEntity(IfcUtil::IfcBaseEntity * entity, int level = 0) {

	// ------------------------------------------------
	// Print basic stuff
	std::string spacer = ".  ";
	for (int i = 0; i < level; i++)
		std::cout << spacer;
	// #ID
	std::cout << "#" << entity->id() << " = ";
	// Classname
	std::cout << IfcSchema::Type::ToString(entity->type()) << " ";
	// if IfcRoot > name & guid
	if (entity->is(IfcRoot::Class())) {
		const IfcRoot* root = (IfcRoot*)entity;
		if (root->hasName())
			std::cout << "'" << root->Name() << "' ";
		std::cout << root->GlobalId();
	}
	// Case - Entity is Property or PhysicalQuantity
	if (entity->is(IfcSchema::IfcProperty::Class())) {
		std::cout << entity->getArgument(0)->toString() << " ";
		std::cout << "= " << entity->getArgument(2)->toString();
	}
	if (entity->is(IfcSchema::IfcPhysicalQuantity::Class())) {
		std::cout << entity->getArgument(0)->toString() << " ";
		std::cout << "= " << entity->getArgument(3)->toString();
	}
	std::cout << std::endl;

	// ------------------------------------------------
	// Direct Attributes
	bool loadAttributes = false;

	std::vector<std::string> attNames = entity->getAttributeNames();
	for (int i = 0; loadAttributes && (i < (int)attNames.size()); i++) {
		for (int i = 0; i < level+1; i++) std::cout << spacer;
		std::cout << "'" << attNames[i] << "' = ";
		std::cout << entity->getArgument(i)->toString();
		std::cout << std::endl;
	}

	// ------------------------------------------------
	// Recursively follow relations

	// Case - Entity is SpatialStructureElement
	if (entity->is(IfcSpatialStructureElement::Class())) {
		const IfcSpatialStructureElement* spatial = (IfcSpatialStructureElement*)entity;
		IfcTemplatedEntityList< IfcRelContainedInSpatialStructure >::ptr containsElements = spatial->ContainsElements();
		for (IfcTemplatedEntityList< IfcRelContainedInSpatialStructure >::it itContainsElements = containsElements->begin(); itContainsElements != containsElements->end(); ++itContainsElements)
		{
			IfcRelContainedInSpatialStructure * relContainedInSpatialStructure = (IfcRelContainedInSpatialStructure*)*itContainsElements;
			IfcTemplatedEntityList< IfcProduct >::ptr listRelatedElements = relContainedInSpatialStructure->RelatedElements();
			IfcTemplatedEntityList< IfcProduct >::it itListRelatedElements = listRelatedElements->begin();
			while (itListRelatedElements != listRelatedElements->end()) {
				IfcUtil::IfcBaseEntity * item = (IfcUtil::IfcBaseEntity*)(*itListRelatedElements++);
				if (item) {
					PrintEntity(item, level + 1);
				}
			}
		}
	} // end if spatial structure element

	// Case - Entity is ObjectDefinition
	if (entity->is(IfcObjectDefinition::Class())) {
		const IfcObjectDefinition* objDef = (IfcObjectDefinition*)entity;

		// Follow Associates relation
		IfcTemplatedEntityList<IfcRelAssociates>::ptr hasAssociation = objDef->HasAssociations();
		for (IfcTemplatedEntityList<IfcRelAssociates>::it itHasAssociation = hasAssociation->begin();
			itHasAssociation != hasAssociation->end(); ++itHasAssociation) {
			IfcRelAssociates * relAssociates = (IfcRelAssociates*)*itHasAssociation;
			
			// TODO: do something

		} // end if hasAssociation
	}

	// Case - Entity is Object
	if (entity->is(IfcObject::Class())) {
		const IfcObject* object = (IfcObject*)entity;

		// Follow DecomposedBy relation
		IfcTemplatedEntityList< IfcRelDecomposes >::ptr isDecomposedBy = object->IsDecomposedBy();
		for (IfcTemplatedEntityList< IfcRelDecomposes >::it itDecomposedBy = isDecomposedBy->begin(); itDecomposedBy != isDecomposedBy->end(); ++itDecomposedBy)
		{
			IfcRelAggregates * relDecomposedBy = (IfcRelAggregates*)*itDecomposedBy;
			IfcTemplatedEntityList< IfcObjectDefinition >::ptr listRelated = relDecomposedBy->RelatedObjects();
			IfcTemplatedEntityList< IfcObjectDefinition >::it itListRelated = listRelated->begin();
			while (itListRelated != listRelated->end()) {
				IfcUtil::IfcBaseEntity * item = (IfcUtil::IfcBaseEntity*)(*itListRelated++);
				if (item) {
					PrintEntity(item, level + 1);
				}
			}
		} // end if decomposes

		// Follow IsDefinedBy relation (PropertySets & Types)
		IfcTemplatedEntityList< IfcRelDefines >::ptr isDefinedBy = object->IsDefinedBy();
		IfcTemplatedEntityList< IfcRelDefines >::it itIsDefinedBy = isDefinedBy->begin();
		while (itIsDefinedBy != isDefinedBy->end()) {
			IfcRelDefines * relDefines = (IfcRelDefines*)(*itIsDefinedBy++);
			// Type definition
			if (relDefines->is(IfcRelDefinesByType::Class())) {
				const IfcRelDefinesByType* definesByType = (IfcRelDefinesByType*)relDefines;
				const IfcTypeObject * typeObject = definesByType->RelatingType();
				IfcUtil::IfcBaseEntity * item = (IfcUtil::IfcBaseEntity*)typeObject;
				if (item) {
					PrintEntity(item, level + 1);
				}
			}
			// Property Definition
			if (relDefines->is(IfcRelDefinesByProperties::Class())) {
				const IfcRelDefinesByProperties* definesByProperties = (IfcRelDefinesByProperties*)relDefines;
				const IfcPropertyDefinition * propDef = definesByProperties->RelatingPropertyDefinition();
				IfcUtil::IfcBaseEntity * item = (IfcUtil::IfcBaseEntity*)propDef;
				if (item) {
					PrintEntity(item, level + 1);
				}
			}
		} // end IsDefinedBy
	} // end if IfcObject

	// Case - Entity is PropertySet or ElementQuantity
	if (entity->is(IfcPropertyDefinition::Class())) {
		// Check Property Definitions
		if (entity->is(IfcPropertySet::Class())) {
			const IfcPropertySet * propSet = (IfcPropertySet*)entity;
			IfcTemplatedEntityList<IfcProperty>::ptr listProperties = propSet->HasProperties();
			IfcTemplatedEntityList<IfcProperty>::it itListProperties = listProperties->begin();
			while (itListProperties != listProperties->end()) {
				IfcUtil::IfcBaseEntity * item = (IfcUtil::IfcBaseEntity*)*itListProperties++;
				if (item) {
					PrintEntity(item, level + 1);
				}
			}
		} // end if Property Set
		// Check Base Quantities
		if (entity->is(IfcElementQuantity::Class())) {
			const IfcElementQuantity * qSet = (IfcElementQuantity*)entity;
			IfcTemplatedEntityList<IfcPhysicalQuantity>::ptr listQuantities = qSet->Quantities();
			IfcTemplatedEntityList<IfcPhysicalQuantity>::it itListQuantities = listQuantities->begin();
			while (itListQuantities != listQuantities->end()) {
				IfcUtil::IfcBaseEntity * item = (IfcUtil::IfcBaseEntity*)*itListQuantities++;
				if (item) {
					PrintEntity(item, level + 1);
				}
			}
		} // end if Element Quantity
	} // end if property definition

}

int main(int argc, char** argv) {
	// Read the file
	IfcParse::IfcFile file;
	if (argc < 1) return 0;
	if ( ! file.Init(argv[1]) ) {
		std::cout << "Unable to parse .ifc file" << std::endl;
		return 1;
	}

	// Read a list of entities
	IfcEntityList::ptr entities(new IfcEntityList());
	entities = file.entitiesByType("IfcProject");
	for (IfcEntityList::it it = entities->begin(); it != entities->end(); ++it) {
		IfcUtil::IfcBaseEntity * entity = (IfcUtil::IfcBaseEntity*)*it;
		// Display information about the entity
		PrintEntity(entity);
	}

	return 0;
}

output.log

./PrintHierarchy ../Models/IfcOpenHouse.ifc 

#12 = IfcProject 'IfcOpenHouse' 1h6kzgF2fA8BQ5niopb7zB
.  #18 = IfcSite 0JA17OO9LAV9bo12Oa92B9
.  .  #25 = IfcBuilding 15SI_NrofB1up99X9U7beo
.  .  .  #32 = IfcBuildingStorey 1alUutlUH7lgQhe1Qj_tCw
.  .  .  .  #34 = IfcWallStandardCase 'South wall' 1YuHUfuqrE8wg5PsSQdDrl
.  .  .  .  #77 = IfcFooting 'Footing' 2i8H67IeD9IOU1gZO_ty_h
.  .  .  .  #187 = IfcRoof 'Roof' 36E1WAkln92OzjkUUsZ8jc
.  .  .  .  .  #188 = IfcSlab 'South roof' 1MRdn1fY10jf_GACKdtpYF
.  .  .  .  .  #189 = IfcSlab 'North roof' 3qwKFIswv1dPhYJKlAO2SN
.  .  .  .  #219 = IfcWallStandardCase 'North wall' 1KPqQr0Pb6qeClM$oN_Z3b
.  .  .  .  #292 = IfcWallStandardCase 'East wall' 3ZW12NntT7ivTZ$F5Qw5tW
.  .  .  .  #299 = IfcWallStandardCase 'West wall' 0NBI7eAdzDovnJGU_NnDOH
.  .  .  .  #2609 = IfcStairFlight 0gm$yeQRj1xxt0B_0lXzcM
.  .  .  .  #2687 = IfcDoor 3Ekq43r6bEoByFKAZ$aeyu
.  .  .  .  .  #2697 = IfcDoorStyle 'Door type' 2Xk2fURwPBXAnV1gWjo9R6
.  .  .  .  #2756 = IfcWindow 3vl_GRpqHA$x$W4D2406Cb
.  .  .  .  .  #2787 = IfcMember 3v11_y5RfFGfsNCxxYjaJo
.  .  .  .  .  #2793 = IfcMember 0NB_dqdAD5x9sBPo12CTYg
.  .  .  .  .  #2804 = IfcMember 342x4ivin36vH6VlAbwStw
.  .  .  .  .  #2810 = IfcMember 3W3DHl5554Iug8Vs3EMHT9
.  .  .  .  .  #2830 = IfcPlate 2vASEfqmr2jQRcyFzwSKDL
.  .  .  .  #2837 = IfcWindow 0XmWSDolr6jxgsOUPrD6cp
.  .  .  .  .  #2863 = IfcMember 0Kmy_W8MTDYB0Or_Y1LirZ
.  .  .  .  .  #2869 = IfcMember 3rzMkPWE9A2BQqA9RHhhDh
.  .  .  .  .  #2875 = IfcMember 1S4j1NVdn5$Rgwmpq7OplQ
.  .  .  .  .  #2881 = IfcMember 2MH68WATr9JQnd3o3ocGtQ
.  .  .  .  .  #2901 = IfcPlate 0ePlx2tv12qPZHPPCZB7G4
.  .  .  .  #2908 = IfcWindow 079RXBBfL8Ae1sDpdNHas4
.  .  .  .  .  #2934 = IfcMember 0zlM3W7qr5OOtGKvHpw5vi
.  .  .  .  .  #2940 = IfcMember 1nkjoVu058kPUvoUhTi_6Z
.  .  .  .  .  #2946 = IfcMember 27Ly7Y$GHD4f7Qyp9xnS3i
.  .  .  .  .  #2952 = IfcMember 19DFw4For1vBB6ibn7IdNd
.  .  .  .  .  #2972 = IfcPlate 0u12N$PF1EfftDWsWRIFCY
.  .  .  .  #2979 = IfcWindow 3$Xk82jXb6KeR0aYzIMPuV
.  .  .  .  .  #3005 = IfcMember 3jgGlg3jbDdQ56XCrciMAN
.  .  .  .  .  #3011 = IfcMember 32Myk4z9z6vvS$tcJPg3k8
.  .  .  .  .  #3017 = IfcMember 2bYkyT22DEFwZAX2K9Uky5
.  .  .  .  .  #3023 = IfcMember 1n1SamiGb3PORMo8xmdnlp
.  .  .  .  .  #3043 = IfcPlate 31cdsB4nb4thXmRKmURy07
.  .  .  .  #3050 = IfcWindow 0Pqx$ypVv3SxG$K80aN8S9
.  .  .  .  .  #3076 = IfcMember 3YW9$IZvj7lxRD8IfC3mEl
.  .  .  .  .  #3082 = IfcMember 0pNcvVYkLCmub7vpcAR0JZ
.  .  .  .  .  #3088 = IfcMember 1MWAO8n8nDxhKOF07_9oNa
.  .  .  .  .  #3094 = IfcMember 2tTaYRsI15fejfAj_FQ$Yo
.  .  .  .  .  #3114 = IfcPlate 3d5PIu9GnFcvO01eDR7s_I
.  .  #322 = IfcPropertySet 'Pset_SiteCommon' 1bEirXC2P98hf0CiUHc$ik
.  .  .  #321 = IfcPropertySingleValue 'TotalArea' = IfcAreaMeasure(523.31397507897)

PrintHierarchy.pro

## -----------------------------------------------------------------
## qmake project file
##
## Usage: qmake -spec macx-xcode (to generate XCode project)
## 
## e.g.
## >> mkdir build && cd build
## >> qmake -spec macx-xcode ../XYZ.pro 
## >> open XYZ.xcodeproj/
## -----------------------------------------------------------------
TEMPLATE =  app
CONFIG += console
CONFIG -= app_bundle

OBJECTS_DIR = ./temp/obj
UI_DIR      = ./temp/ui
MOC_DIR     = ./temp/moc


## IFC 4 Support (instead of Ifc2x3)
# DEFINES += USE_IFC4

INCLUDEPATH += /usr/local/include
LIBS += -L/usr/local/lib

## -----------------------------------------------------------------
## Qt5 (GUI, Application, Integration)
## -----------------------------------------------------------------
QT -= core gui widgets # no Qt Libraries to link

## Enforce debug modus (especially for XCode debug sessions!)
CONFIG += debug # debug_and_release

# This is an unsupported configuration. You may experience build issues, and by using
# the 10.13.4 SDK you are opting in to new features that Qt has not been prepared for.
# Please downgrade the SDK you use to build your app to version 10.13, or configure
# with CONFIG+=sdk_no_version_check when running qmake to silence this warning.
CONFIG+=sdk_no_version_check

# remove ld:warning ... was built for newer OSX version (10.13) than being linked (10.11)
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.13

## -----------------------------------------------------------------
## OpenCASCADE (3D Geometry Support)
## (Not required for this example - no geometry support)
## -----------------------------------------------------------------
# DEFINES += USE_OCC
# INCLUDEPATH += /usr/local/include/oce /usr/local/include/opencascade
# LIBS += -lTKernel -lTKMath -lTKService -lTKV3d -lTKOpenGl \
#     -lTKBRep -lTKIGES -lTKSTL -lTKVRML -lTKSTEP -lTKSTEPAttr -lTKSTEP209 \
#     -lTKSTEPBase -lTKGeomBase -lTKGeomAlgo -lTKG3d -lTKG2d \
#     -lTKXSBase -lTKShHealing -lTKHLR -lTKTopAlgo -lTKMesh -lTKPrim \
#     -lTKCDF -lTKBool -lTKBO -lTKFillet -lTKOffset

## -----------------------------------------------------------------
## IfcOpenShell (IFC File Support)
## -----------------------------------------------------------------
LIBS += -lIfcParse # -lIfcGeom

# NEEDS ICU libraries for Unicode Support
LIBS += -L/usr/local/opt/icu4c/lib
LIBS += -licuuc -licudata #-licutu -licuio
INCLUDEPATH += /usr/local/opt/icu4c/include

## -----------------------------------------------------------------
## Application
## -----------------------------------------------------------------
SOURCES += main.cpp

##HEADERS += 
    
    
## -----------------------------------------------------------------
## Resources & Images & Icon
## -----------------------------------------------------------------

A minimal example, to show parsing of an IFC file from Project down to individual entities and attributes.