Question

I have to extract some data from a .MPP file format in Objective-C.

I found nothing on internet to do so. any idea on how to read the file ?

Answer 1

well, might be indirectly helpful: http://mpxj.sourceforge.net/

Welcome to MPXJ! This library provides a set of facilities to allow
project information to be manipulated in Java and .Net. MPXJ supports
seven data formats, Microsoft Project Exchange (MPX), Microsoft
Project (MPP,MPT), Microsoft Project Data Interchange (MSPDI XML),
Microsoft Project Database (MPD), Planner (XML), and Primavera (XER
and database).

The library is currently based around a set of structures modelled on
the data described by the MPP file format. All manipulation of project
data takes place using these data structures, which can be read from
or written to the various supported file formats. The notes in the
following paragraphs explain the facilities MPXJ offers for each file
format.

So you might be able to take some of that code and port it to obj-c … good luck!