CGAL users discussion list

[Yang Qu <>]

 写道:
> Hi,
>
> I am a newbie to CGAL. I was writing a code to access OFF files. I am not able
> to access the properties of mesh. Could some one please point out where I am
> making the mistake. 
>
> #include <CGAL/Simple_cartesian.h>
> #include <CGAL/Polyhedron_3.h>
> #include <CGAL/IO/Polyhedron_iostream.h>
>
> #include <iostream>
> #include <istream>
> #include <fstream>
>
> typedef CGAL::Simple_cartesian<double> Kernel;
> typedef CGAL::Polyhedron_3<Kernel>     Polyhedron;
>
> int main() {
>     std::ifstream stream("test.off");
>     Polyhedron P;
>     stream >> P;
>     std::cout << "\n "<<P.size_of_vertices();
>     return 0;
> }
>
>
>
> I even used the following code snippet but still not able to fetch the mesh in
> <Polyhedron>P (no ERRORS were thrown).
>
>         istream*     p_in = &cin;
>         ifstream     in;
>         in.open("test.off");
>         p_in = &in;
> 	if ( !in) 
> 	{
>                 cerr << "ERROR: cannot open file for reading.";
>                 exit( 1);
>         }
>         
>         if ( !(*p_in)) {
>                 cerr << "ERROR: file not in OFF format or error while 
> reading";
>                 exit( 1);
>         }
>
>         Polyhedron P;
>         (*p_in) >> P;
>   
Hi,

I tested your first piece of code, and it's ok to me. The size of 
vertices is printed out.

Cheers,
Yang