how copy gchar* pointer to other gchar*, send two widgets refs to callback function ?

[Mario Lopez <mariotpc gmail com>]

Greetings ....

I want to ask something to them about this function

/**************************************** FUNCTION
*****************************************/
void on_btnEnviar_clicked (GtkButton *button, gpointer user_data)
{
   GtkTextIter start;
   GtkTextIter end;
   GtkWidget *dialog;
   GtkTextBuffer* text_buffer=0;
   gchar* buf=0;
   gchar* msg=0;
      
   text_buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(user_data));
   gtk_text_buffer_get_start_iter(text_buffer,&start);
   gtk_text_buffer_get_end_iter(text_buffer,&end);
   buf=gtk_text_buffer_get_text(text_buffer,&start, &end,TRUE);

   //msg = "net send /domain:teacher ";	
   //strcpy (msg,buf);
   dialog = gtk_message_dialog_new(NULL,
									GTK_DIALOG_MODAL,
									GTK_MESSAGE_INFO,
									GTK_BUTTONS_OK,
									"El mensaje : %s\n Fue enviado satisfactoriamente ...", buf);
	
	/*WinExec( msg, SW_MINIMIZE ) */
	
	gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_destroy(dialog);

	g_free(buf);
};

/**************************************** END FUNCTION
******************************************/

as you can see... I want to copy the content of buf to msg to having
in the msg = "net send /domain:teacher and the message that user want
to send...."

but when copying the content the program crash...

another question....

void on_btnEnviar_clicked (GtkButton *button, gpointer  user_data)

recives at user_data  a reference to textview widget, but how can
recive the textview and other widget ? by example a reference to
combobox, something like.

void on_btnEnviar_clicked (GtkButton *button, gpointer  textview,
gpointer cbowho)

thankX....

/********************************************************************
Mario Enrique López Guzmán
mariotpc gmail com
cancuen.berlios.de
*********************************************************************/