Choose a file from folder using "file chooser button" or other widget

import hal
import glib
import time

class HandlerClass:
    '''
    class with gladevcp callback handlers
    '''

    def on_button_press(self,widget,data=None):

        self.vcp_filechooserbutton2.set_current_folder('/home/sr/folder1/new')
        self.vcp_filechooserbutton1.set_current_folder('/home/sr/folder2/old')
        '''
        a callback method
        parameters are:
            the generating object instance, likte a GtkButton instance
            user data passed if any - this is currently unused but
            the convention should be retained just in case
        '''
        print "on_button_press called"
        self.nhits += 1
        self.builder.get_object('hits').set_label("Hits: %d" % (self.nhits))

    def __init__(self, halcomp,builder,useropts):  /* these code is more longer ... is from gladepvc example and I modify only those 2 button*/

linuxcnc-dev/bin/gladevcp:214: RuntimeWarning: missing handler 'hal_hscale_delay_destroy'
  builder.connect_signals(handlers)

def on_par_destroy(self,obj,data=None):
        self.ini.save_state(self)

import hal
import glib
import time
import gtk
import gtk.glade
import gobject
import os



class HandlerClass:
    '''
    class with gladevcp callback handlers
    '''

    def on_button_press(widget,data=None):

        '''
        a callback method
        parameters are:
            the generating object instance, likte a GtkButton instance
            user data passed if any - this is currently unused but
            the convention should be retained just in case
        '''
        print "on_button_press called"
        self.nhits += 1
        self.builder.get_object('hits').set_label("Hits: %d" % (self.nhits))

    def on_window1_destroy_event(widget, data=None):
        gtk.main_quit()

    def on_notebook1_destroy(self,obj,data=None):
        self.ini.save_state(self)



    def __init__(self, halcomp,builder,useropts):
        '''
        Handler classes are instantiated in the following state:
        - the widget tree is created, but not yet realized (no toplevel window.show() executed yet)
        - the halcomp HAL component is set up and the widhget tree's HAL pins have already been added to it
        - it is safe to add more hal pins because halcomp.ready() has not yet been called at this point.

        after all handlers are instantiated in command line and get_handlers() order, callbacks will be
        connected with connect_signals()/signal_autoconnect()

        The builder may be either of libglade or GtkBuilder type depending on the glade file format.
        '''
        self.halcomp = halcomp
        self.builder = builder
        self.nhits = 0

        builder.get_object('vcp_filechooserbutton1').set_current_folder(os.path.expanduser('~/home/PC/FOLDER1/'))
        builder.get_object('vcp_filechooserbutton2').set_current_folder(os.path.expanduser('~/home/PC/FOLDER2'))




    def get_handlers(halcomp,builder,useropts): /* these row have a tab space that is an error .... so my error because retur is out of handlers .... I forgot the space order of python script ... */
    '''
    this function is called by gladevcp at import time (when this module is passed with '-u <modname>.py')

    return a list of object instances whose methods should be connected as callback handlers
    any method whose name does not begin with an underscore ('_') is a  callback candidate

    the 'get_handlers' name is reserved - gladevcp expects it, so do not change
    '''


    return [HandlerClass(halcomp,builder,useropts)]

[DISPLAY]
GLADEVCP= -u hitcounter.py my_filechooser_button.test.ui   /* <-- with 2 EMC_filechooserbutton inside similar to yours */
DISPLAY = axis
CYCLE_TIME = 0.100
HELP_FILE = doc/help.txt

Starting LinuxCNC...
Starting LinuxCNC server program: linuxcncsvr
Loading Real Time OS, RTAPI, and HAL_LIB modules
Starting LinuxCNC IO program: io
Starting HAL User Interface program: halui
Found file(LIB): /home/PC/linuxcnc-dev/lib/hallib/basic_sim.tcl
Starting TASK program: milltask
Starting DISPLAY program: axis
Embeded tab command "halcmd loadusr -Wn gladevcp gladevcp -c gladevcp -x 90177679 -u hitcounter.py bmeccanica_ultrasonic.ui" exited with error: 1
Shutting down and cleaning up LinuxCNC...
Killing task linuxcncsvr, PID=31177
Killing task milltask, PID=31209
task: 660 cycles, min=0.000005, max=0.006313, avg=0.001064, 0 latency excursions (> 10x expected cycle time of 0.001000s)
Removing HAL_LIB, RTAPI, and Real Time OS modules
Removing NML shared memory segments

Debug file information:
setup_kins: cmd=loadrt trivkins
Note: Using POSIX realtime
note: MAXV     max: 1.200 units/sec 72.000 units/min
note: LJOG     max: 1.200 units/sec 72.000 units/min
note: LJOG default: 0.250 units/sec 15.000 units/min
note: jog_order='XYZ'
note: jog_invert=set([])
Traceback (most recent call last):
  File "/home/PC/linuxcnc-dev/bin/gladevcp", line 312, in <module>
    main()
 File "/home/PC/linuxcnc-dev/bin/gladevcp", line 212, in main
    handlers = load_handlers(opts.usermod,halcomp,builder,opts.useropts)
  File "/home/PC/linuxcnc-dev/bin/gladevcp", line 113, in load_handlers
    mod = __import__(basename)
  File "./hitcounter.py", line 67
    '''
IndentationError: expected an indented block
<commandline>:0: waitpid failed gladevcp gladevcp
<commandline>:0: gladevcp exited without becoming ready
31177
  PID TTY      STAT   TIME COMMAND
31209
  PID TTY      STAT   TIME COMMAND
Stopping realtime threads
Unloading hal components
Note: Using POSIX realtime

Traceback (most recent call last):
  File "/home/PC/linuxcnc-dev/bin/gladevcp", line 312, in <module>
    main()
 File "/home/PC/linuxcnc-dev/bin/gladevcp", line 212, in main
    handlers = load_handlers(opts.usermod,halcomp,builder,opts.useropts)
  File "/home/PC/linuxcnc-dev/bin/gladevcp", line 113, in load_handlers
    mod = __import__(basename)
  File "./hitcounter.py", line 67
    '''
IndentationError: expected an indented block

LINUXCNC - 2.8.0~pre1
Machine configuration directory is '/home/PC/linuxcnc-dev/configs/sim/axis/gladevcp'
Machine configuration file is 'gladevcp_panel.ini'
Starting LinuxCNC...
Found file(LIB): /home/PC/linuxcnc-dev/lib/hallib/basic_sim.tcl
setup_kins: cmd=loadrt trivkins
Note: Using POSIX realtime
note: MAXV     max: 100.000 units/sec 6000.000 units/min
note: LJOG     max: 100.000 units/sec 6000.000 units/min
note: LJOG default: 50.000 units/sec 3000.000 units/min
note: jog_order='XYZ'
note: jog_invert=set([])
/home/PC/linuxcnc-dev/bin/gladevcp:298: GtkWarning: gtk_widget_size_allocate(): attempt to allocate widget with width -5 and height 17
  gtk.main()
task: main loop took 0.010049 seconds
/home/PC/linuxcnc-dev/bin/gladevcp:298: GtkWarning: GdkWindow 0x5000003 unexpectedly destroyed
  gtk.main()
**** GLADE VCP ERROR:    X Protocol Error: 3
Shutting down and cleaning up LinuxCNC...
task: 17359 cycles, min=0.000005, max=0.010049, avg=0.001056, 1 latency excursions (> 10x expected cycle time of 0.001000s)
Note: Using POSIX realtime

def on_window1_destroy_event(widget, data=None):
        gtk.main_quit()

    def on_notebook1_destroy(self,obj,data=None):
        self.ini.save_state(self)