IfcOpenShell access IFC-SPF header data

B by bernd on 1 Dec 2020, edited 15 Dec 2023 #

Is it possible to get the Header FILE_DESCRIPTION and FILE_NAME by Python?

HEADER;FILE_DESCRIPTION(('no view'),'2;1');

FILE_NAME('C:\\Users\\BHA\\Desktop\\exporter_new.ifc',

'2020-10-29T15:57:39',('Bernd Hahnebach'),('My Office AG',

'My Street 32, 9999 My Town'),

'EDMsix Version 2.0100.09 Sep  7 2016',

'Allplan 2020.1 09.09.2020 - 17:35:19','');

FILE_SCHEMA(('IFC2X3'));

ENDSEC;

The schema is possible with ifcos_ifc_class.schema. This is what I know and use.

B by bernd on 1 Dec 2020 #

BTW: Found this in the regard of the header, but it is quite old ... https://standards.buildingsmart.org/documents/Implementation/ImplementationGuide_IFCHeaderData_Version_1.0.2.pdf

M by Moult on 1 Dec 2020 #

@bernd yes, using ifc_file.wrapped_data.header. See:

https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.6.0/src/ifcblenderexport/blenderbim/bim/export_ifc.py#L1411

B by bernd on 1 Dec 2020 #

but this is set_header, for export. I would like to read the data out of a ifc file like get_header ...

M by Moult on 1 Dec 2020 # +1 votes

@bernd no, set_header is simply a function in the BlenderBIM Add-on during the export process. Look at the lines after it.

B by bernd on 2 Dec 2020, edited 2 Dec 2020 #

got it ... :-)

myifcfile.wrapped_data.header.file_description.description

myifcfile.wrapped_data.header.file_description.implementation_level

myifcfile.wrapped_data.header.file_name.name

...

B by bernd on 2 Dec 2020 #

How about the comments Revit does write before it even starts the ifc file contents. I assume reading comments is not possible?!

M by Moult on 2 Dec 2020 #

@bernd good point, I haven't seen a way to access comments. It's a relatively simple string parse, though...

C by Coen on 28 Jul 2022, edited 28 Jul 2022 #

How would once acces the timestamp in FILE_NAME using IfcOpenShell?


ISO-10303-21;

HEADER;

FILE_DESCRIPTION(('ViewDefinition[DesignTransferView]'),'2;1');

FILE_NAME('test_load.ifc','2022-07-28T16:10:23+02:00',(),(),'IfcOpenShell v0.7.0-1b1fd1e6','BlenderBIM 0.0.220516','Nobody');

FILE_SCHEMA(('IFC4'));

ENDSEC;

DATA;

It's a relatively simple string parse, though...

As I understand it is not possible with IfcOpenShell yet... :-)?

What about something like this?


import os

import re

import bpy

import ifcopenshell


from blenderbim.bim.ifc import IfcStore




ifc_file = ifcopenshell.open(IfcStore.path)




with open(IfcStore.path) as ifc_text:

    for line_no, line_file in enumerate(ifc_text):

        if line_no  == 3:

            if line_file.startswith("FILE_NAME"):

                print (line_file.split(',')[1])

Is the FILE_NAME always on line 4? seems a bit risky method, string parsing...

G by Gorgious on 29 Jul 2022 #

It will work for this specific file but I'm sure it's not that hard to make it fail ^^ What if your file name has a , in it ? I think it would be a bit more robust to check all lines and see if they begin with FILE_NAME and then parse the string with a regular expression to see if something matches a date formating.

A by Andrej730 on 15 Dec 2023 # +1 votes

@Coen said:

How would once acces the timestamp in FILE_NAME using IfcOpenShell?

I'm very late to the party, just found this thread looking for similar issues, but it's just ifc_file.wrapped_data.header.file_name.time_stamp, in similar way as accessing any other header entities.