Re: closing the window automatically

[Chris Vine <chris cvine freeserve co uk>]

On Monday 19 February 2007 12:42, SaiKamesh Rathinasabapathy wrote:
[snip]

This is your problem:

  Gtk::Main::run(obj.wind);// displaying the first window
  ^^^^^^^^^^^^^^
	char letter;
	while(!STOP)
     	{

		if((letter=obj.rs_getch(port))>0)  // getting the data from the serial port
  charecter by charecter and storing those values in a charecter array.
         	{ 
			buffer[i] = letter;
			i++;

         	}
		if(strlen(buffer) >= 119)
		{
			temp = 1;
			break;
		}

     	}
	if(temp == 1)
	{
		obj.wind.hide();//here i want to close the first window, but it is not
		^^^^^^^^^^^^^

Like practically all other GUI toolkits, GTK+ is event based.  
Gtk::Main::run() will start the event loop and block until something else 
causes it to unblock, such as the main window having Gtk::Widget::hide() 
called on it (or if you have called Gtk::Main::run(void) rather than 
Gtk::Main::run(Gtk::Window&), by calling Gtk::Main::quit()).

One quick hack is to move the code after your call to Gtk::Main::run up to an 
including Gtk:Widget::hide() into your main window's constructor (that will 
do if it does not take a long time to execute).  Otherwise the normal 
approach would be to read the serial port with a non-blocking read and plumb 
it into the main program loop with Gtk::signal_io() (see
http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1SignalIO.html ).
You will need a file descriptor to do that.  If you do not have a file 
descriptor, one less optimal choice is to set up a timeout and poll the 
serial port (with a non-blocking read) at regular intervals, appropriate to 
the likely data rate.

Chris