Professional IronPython

lISTINg 8-4: 
 Handling timer events in a form
# Set up the path to the .NET Framework. 
import sys
sys.path.append(‘C:\\WINDOWS\\Microsoft.NET\\Framework\\v2.0.50727’)
# Make clr accessible.
import clr
# Add any required references.
clr.AddReference(‘System.Windows.Forms.DLL’)
# Import the .NET assemblies.
FIguRE 8-7: 
The started application shows 
the current long time format.
continues
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CHAPTER 8
Creating WindoWs Forms appliCations
import System
import System.Windows.Forms
# import the form.
from frmUseTimer import * 
# Define the event handlers.
def btnStart_Click(*args):
# Check the button status.
if TestForm.btnStart.Text == ‘&Start’:
# Start the timer.
TestForm.objTimer.Start()
# Change the button text.
TestForm.btnStart.Text = ‘&Stop’
else:
# Start the timer.
TestForm.objTimer.Stop()
# Change the button text.
TestForm.btnStart.Text = ‘&Start’
def btnQuit_Click(*args):
# Close the application.
TestForm.Close() 
def objTimer_Tick(*args):
# Handle the timer tick.
TestForm.lblTime.Text = System.DateTime.Now.ToLongTimeString() 
# Define the Windows Form and the elements of this specific instance.
TestForm = frmMain()
TestForm.InitializeComponent() 
# Always add event handlers after defining the Windows Form.
TestForm.btnStart.Click += btnStart_Click
TestForm.btnQuit.Click += btnQuit_Click
TestForm.objTimer.Tick += objTimer_Tick
# Run the application.
System.Windows.Forms.Application.Run(TestForm)
This example begins as any Windows Forms application does, by providing access to the .NET 
Framework directory and then importing the required assemblies after adding any required 
lISTINg 8-4 
(continued)
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