problem in gtktextview

["Manoj tr" <trmanoj linuxmail org>]

hai 
   I have a problem with textview. I want to replace the characters in a gtktextview after checking some condition. ie when i press "A" the displayed character will be H. But in the case of textview i enter the all code to rplace the character,  but it will print both characters  "AH" ie the actual one and the mapped one. I place the code bellow. any replay will very thankful to you. I want to build an editor in regional language. I think some problem in iteration. It will not correctly initialize.

With Regards
Manoj

#########################################

#include <gtk/gtk.h>

PangoFontDescription *font_kar;
GtkTextView *textview1;
GtkTextBuffer *Buf;
GtkTextIter IterCur, IterSel, IterEnd;
GtkTextMark *MarkCur, *MarkSel;

static gboolean delete_event( GtkWidget *widget,
                              GdkEvent  *event,
                              gpointer   data )
{
    gtk_main_quit ();   return FALSE;
}

gboolean
on_textview1_realize           (GtkWidget       *widget,
                                        GdkEventKey     *event,
                                        gpointer         user_data)
{

  font_kar = pango_font_description_from_string("Sans 16");
  textview1=GTK_TEXT_VIEW(widget);
  gtk_widget_modify_font(GTK_WIDGET(textview1),font_kar);
  Buf = gtk_text_view_get_buffer (GTK_TEXT_VIEW(textview1)) ;
gtk_widget_grab_focus(GTK_WIDGET(textview1));
  MarkCur = gtk_text_buffer_get_mark ( Buf, "insert" ) ;
  gtk_text_buffer_get_iter_at_mark ( Buf, &IterCur, MarkCur ) ;

}
gboolean
on_textview1_key_press_event           (GtkWidget       *widget,
                                        GdkEventKey     *event,
                                        gpointer         user_data)
{

 int Pos,SelPos;
    gchar *fchar;
    Buf = gtk_text_view_get_buffer( GTK_TEXT_VIEW( widget)) ;
    MarkCur = gtk_text_buffer_get_insert(Buf);
    gtk_text_buffer_get_iter_at_mark ( Buf, &IterCur,MarkCur ) ;
 gtk_text_buffer_get_iter_at_offset(Buf,&IterEnd,-1);
        switch (event->keyval) {
                case 65: // 'A'
                gtk_text_buffer_insert( Buf,&IterCur,"H",-1);
  //              gtk_text_buffer_insert( Buf,&IterCur,"m",-1);
gtk_text_buffer_get_iter_at_offset(Buf,&IterEnd,gtk_text_iter_get_offset(&IterCur)-1);
//gtk_text_buffer_delete(Buf,&IterCur,&IterEnd);
                break;
        }
    return FALSE;
}

int main( int   argc,
          char *argv[] )
{
gtk_init (&argc, &argv);
GtkWidget *window1;
  GtkWidget *scrolledwindow1;
  GtkWidget *textview1;
                                                                                                               
  window1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_name (window1, "window1");
  gtk_window_set_title (GTK_WINDOW (window1), ("window1"));
  scrolledwindow1 = gtk_scrolled_window_new (NULL, NULL);
  gtk_widget_set_name (scrolledwindow1, "scrolledwindow1");
  gtk_widget_show (scrolledwindow1);
  gtk_container_add (GTK_CONTAINER (window1), scrolledwindow1);
  textview1 = gtk_text_view_new ();
  gtk_widget_set_name (textview1, "textview1");
  gtk_widget_show (textview1);
  gtk_container_add (GTK_CONTAINER (scrolledwindow1), textview1);
  gtk_widget_set_size_request (textview1, 300, 400);
  g_signal_connect ((gpointer) textview1, "realize",
                    G_CALLBACK (on_textview1_realize),
                    NULL);
  g_signal_connect ((gpointer) textview1, "key_press_event",
                    G_CALLBACK (on_textview1_key_press_event),
                    NULL);
  g_signal_connect ((gpointer) window1, "delete_event",
                    G_CALLBACK (delete_event),
                    NULL);
/* Rest in gtk_main and wait for the fun to begin! */
gtk_widget_show (window1);
    gtk_main ();
    return 0;
}

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