Please help: How to embed a X window in a GTK window?

[Ke Jin]

Dear All,
   I am working on a project whose code was written in Xlib and now I  
need to develop a GUI for it. I want to use GTK so I wonder if I could  
embed the former xlib window into a GTK top-level window. I wrote a  
small test program as below but it doesn't work. Does anyone have any  
idea about how this is gonna work?

#include <string.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>

void destroy (GtkWidget *widget, gpointer *data)
{
     gtk_main_quit ();
}



int main(int argc, char* argv[])
{
     Display* display = XOpenDisplay(NULL);
     int screen = DefaultScreen(display);
     int width = DisplayWidth(display, screen)/6;
     int height = DisplayHeight(display, screen)/6;
     GtkWidget *gtkWin;
     XEvent e;
     pid_t pid;
     Bool child = FALSE;
     int timer = 0;

     gtk_init (&argc, &argv);

     gtkWin = gtk_window_new(GTK_WINDOW_TOPLEVEL);

     gtk_signal_connect(GTK_OBJECT(gtkWin),  
"destroy",GTK_SIGNAL_FUNC(destroy),NULL);

     gtk_widget_realize(gtkWin);

     Window win = XCreateSimpleWindow(display, RootWindow(display,  
screen),
       0, 0, width, height, 3, BlackPixel(display, screen),  
WhitePixel(display, screen));
     XStoreName(display, win, "hello");
     GC gc = XCreateGC(display, win, 0, NULL);

     XMapWindow(display, win);

     XSelectInput(display, win, ExposureMask|ButtonPressMask);

     if((pid = fork()) <0 )
     {
         perror("fork");
         exit(1);
     }
     else if(pid > 0)
     {
         printf("parent\n");

         XReparentWindow(display,win,GDK_WINDOW_XID(gtkWin->window), 
50,50);
         XMapWindow(display,GDK_WINDOW_XID(gtkWin->window));
         gtk_widget_show(gtkWin);


         gtk_main();

     }
     else
     {
         printf("child\n");
        
         while(1)
        {
                    XNextEvent(display, &e);
            if(e.type==Expose && e.xexpose.count<1)
            {
                 XDrawString(display, win, gc, 10, 10, "Hello World!",  
12);

             }
            else if(e.type==ButtonPress)
             {
                XCloseDisplay(display);
                break;
            }
             else
             {
             }
         }
     }


     return 0;
}


Thanks & Regards,
Kay
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