Please help: How to embed an X window into a GTK Window?

["Ke Jin" <kj2203 columbia edu>]

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