Multithreaded App.

[Muthu <dearestchum yahoo co in>]

Hi!
I have a problem with this GTK code.
Actually I want it to show the image, on
the X Window system, when I just pass the filename
around.

   It kind of works, really, can show multiple files
on different invocations, but reports some X error,
saying program is wrongly coded etc.

I read the GTK FAQ, and some mailing list problems,
posted earlier. But please help me on this.

The code goes below.
I invoke this function many times within GNU Octave,
octave1> Display("hello.png")
octave2> Display("world.png")
octave3> Display("fubar.png")


And it does some crazy stuff [mind you, most of the
times it displays separate windows with images on it].

Thanks in advance.

Cheers
Muthu.
---------------Code ----------------------------
/* GPL'ed . see www.gnu.org*/
#include<iostream>
#include<octave/oct.h>
#include<octave/parse.h>
#include<octave/dynamic-ld.h>
#include<octave/oct-map.h>
#include<octave/oct-stream.h>
#include<octave/parse.h>        /* for feval */
#include<vector>
#include<string>

using namespace std;

extern "C"
{
#include<gtk/gtk.h>
}


DEFUN_DLD(Display,args,,
          "This function tries to show the image on the X
server")
{
  static int entered_main=FALSE;
  GtkWidget *w;
  gchar *filename=args(0).string_value().c_str();

  if(!gtk_init_check(NULL,NULL)){
    gtk_init(NULL,NULL);
    g_thread_init();
    std::cout<<"GTK Type system
Initialized"<<std::endl;
  }
  
  w=gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title(GTK_WINDOW(w),filename);
 
g_signal_connect(G_OBJECT(w),"destroy",G_CALLBACK(gtk_main_quit),NULL);

  gtk_container_add(GTK_CONTAINER(w),
                    gtk_image_new_from_file(filename));

  gtk_widget_show_all(w);

  if(!entered_main){
    //Work only 1 main loop. 
    g_thread_create(gtk_main,NULL,TRUE,NULL);
    entered_main=!entered_main;
  }

  return octave_value();
}




                
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