gtk callback problem in C++

I have a callback function which I want to pass two Entrys to a read the text from the entry boxes. It appears the convention is to pass the data to the callback function as a gpointer. I am attempting to then cast this back to a struct which holds the two Entries. Here is the relevant code

Code:

class ChatWindow 
{
   struct connectEntryStruct
       {
          GtkEntry *ipEntry;
	  GtkEntry *portEntry;
       };	
   public:
    .
    .  
      void connect(GtkWidget *widget, gpointer connectEntry);
      static void staticWrapperConnect(void *ptfncHello, GtkWidget *widget, gpointer connectEntry);
.
.
}

Code:

GtkWidget * ChatWindow::connectLayOut(GtkWidget * window)
{
       .
       .
      .       
       GtkWidget *ipEntry = gtk_entry_new();
         
       GtkWidget *portEntry = gtk_entry_new();
   .
   .    
       connectEntryStruct * connectEntry = new connectEntryStruct;
       connectEntry->ipEntry = GTK_ENTRY(ipEntry);
       connectEntry->portEntry = GTK_ENTRY(portEntry);
    .    
       g_signal_connect (G_OBJECT (connectButton), "clicked",
                      G_CALLBACK (staticWrapperConnect), connectEntry);
 }

Code:

   
void ChatWindow::connect( GtkWidget *widget, gpointer connectData)
{
    
    connectEntryStruct * connectEntry = reinterpret_cast<connectEntryStruct*>(connectData);
    const gchar * ipAdress = gtk_entry_get_text(connectEntry->ipEntry);
    const gchar * portNumber = gtk_entry_get_text(connectEntry->portEntry);
    
    g_print ("ipAdress\n");
    g_print ("portAdress\n");
}

void ChatWindow::staticWrapperConnect(void *ptfncHello, GtkWidget *widget, gpointer connectEntry)
{
   ChatWindow *chatHello = (ChatWindow*) ptfncHello;  //cast to member function
   chatHello->connect(widget, connectEntry);
}

here are the errors

(gtkwindow:13584): Gtk-CRITICAL **: file gtkentry.c: line 3871 (gtk_entry_get_text): assertion `GTK_IS_ENTRY (entry)' failed
/bin/sh: line 1: 13584 Segmentation fault ./gtkwindow
Press Enter to continue!

Is it possible to do this somehow so that I can pass my Entries without making them global.

No idea, but try http://www.spinics.net/lists/gtk/msg03864.html
The mailing list which this site refers to looks like its worth joining (or at least reading)