Hello, Christian ¡¡¡¡¡¡¡ Yes ¡¡¡¡ Firts trying a casting onto function -------------- png_size1 = (ptrdiff_t) png_read_dimensions( "prueba.png" ); -------------- This give a error, but important information-> error: invalid cast from type ‘boost::gil::point2<long int>’ to type ‘ptrdiff_t’ So try: ---- point2<long int> png_size1(3,4); ---- And all is it OK :)))) But your solution is the best. ---------- point2 png_size1(3,4); ..... png_size1 = (ptrdiff_t) png_read_dimensions( "prueba.png" ); --------- And leave the compiler to choose the correct type ¡¡¡¡ ;) Thank a lot of.. 2010/3/19, Christian Henning :

Hi Juanma,

On Thu, Mar 18, 2010 at 3:14 PM, Juanma Font wrote:

...

Hello ¡¡¡

 Probed with boost 1.38 and 1.40 on linux ubuntu karmic

  Example: check64.cpp

--------------- #include "check64.hpp"

int main()

{ point2<int> png_size1(3,4); point2<int> png_size2;

wxMessageBox( wxT("Reading png dimensions prueba.png "), wxT("Hello") );

// ok, compile into 32bits and 64bits png_size2=png_size1;

// ok, compile into 32bits and 64bits png_read_dimensions( "prueba.png" );

//ERROR, THIS ONLY COMPILE WITH 32bits png_size1 = png_read_dimensions( "prueba.png" );

return 0; }

Can you use ptrdiff_t instead of int? If not you might have to define a custom convert function since png_read_dimensions() returns point2. A fix is simple but you might be satisfied with ptrdiff_t.

Regards, Christian _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users