[gtkmm] Error creating a pixbuf from an image

[Don Scorgie <DonScorgie Blueyonder co uk>]

hi,

I am trying to create a Gdk::Pixbuf from a Gdk::Image using
Gdk::Pixbuf::create(const Glib::RefPtr<Image>&,
const Glib::RefPtr<Colormap>&, int src_x, int src_y, int dest_x, 
int dest_y, int width, int height)

Unfortunately, whenever I try, it seg faults.

Each variable, I am taking to mean:
src_x/y: The upper left corner of the image (i.e. 0,0)
dest_x/y: The upper left corner of the destination(i.e. 0,0)
If I am wrong, please let me know.

Attached is the smallest example I can create.  Any help would be much
appreciated.

Cheers
Don


#include <gtkmm.h>
#include <gdkmm.h>
#include <iostream>

class nWindow: public Gtk::Window
{
 public:
  nWindow();

 private:
  Glib::RefPtr<Gdk::Visual> vis;
  Glib::RefPtr<Gdk::Image> image;

};

nWindow::nWindow()
{
   vis = Gdk::Visual::get_system();

   image = Gdk::Image::create(Gdk::IMAGE_FASTEST, vis, 100, 100);


  Glib::RefPtr<Gdk::Colormap> colorm = image->get_colormap();
  std::cout<<"Got the colormap"<<std::endl;
  Glib::RefPtr<Gdk::Pixbuf> p =
    Gdk::Pixbuf::create (image, colorm, 0, 0, 0, 0, 100, 100);
  std::cout<<"Got the Pixbuf"<<std::endl;

}


int main(int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);
  
  nWindow window;
  Gtk::Main::run(window);
  return 0;


}