CGAL users discussion list

["Rui Guo" <>]

Chapter 63 IO Streams in manul may help.
You need to set stream mode to binary.

2008/11/18 Joe C <>

Hi,

I got some issue with Polyhedron_3 I/O stuff. I have two polyhedron .off files in ascii mode (poly_ascii.off) and binary mode (poly_binary.off) respectively. They are the same polyhedron, the only difference is that one is in ascii mode and the other is in binary mode. I use the following code snipet to read in the files

typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef CGAL::Polyhedron_3<Kernel>         Polyhedron;

// Read in ascii file
Polyhedron poly_ascii;
std::ifstream OpenFile("poly_ascii.off");
OpenFile >> poly_ascii;
OpenFile.close();

std::cout<< "poly is valid ? " << poly_ascii.is_valid() << std::endl; // true
std::cout<< "size of facets ? " << poly_ascii.size_of_facets() << std::endl; // This is O.K, size of polyhedron is correct.

/////////////////////////////////
// Read in binary file, replacing the above code
Polyhedron poly_binary;
std::ifstream OpenFile("poly_binary.off");
OpenFile >> poly_binary;
OpenFile.close();

std::cout<< "poly is valid ? " << poly_binary.is_valid() << std::endl; // true
std::cout<< "size of facets ? " << poly_binary.size_of_facets() << std::endl; // This is NOT O.K, size of polyhedron is zero.


It seems that CGAL does not handle the binary case correctly. Is this a bug or am I missing something to read the binary file right?

Thanks.

Joe