Digitax Force One MDT, Техническое руководство, Страница: 53 / 56

The information contained here are property of DIGITAX Automotive Electronics Italy, and extremely confidential. Any disclosure, copying, distribution to third
party is strictly prohibited.
53
7. Digital I/O (IPreShut)
This application shows how to use the Digital I/O library to monitor the IPreShut (digital value) that
becomes high (true) when Windows is shutting down. This feature is very important because makes
possible, for an application, to make a safe closure.
Sample code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Digitax.Sample.DigitalIOTest
{
// simple application that cheks the Ipreshut digital value
public partial class DigitalIOTest : Form
{
//DigitalIO Wrapper Instance
DigitalIO.Wrapper41. DigitalIO _digitalIO = new DigitalIO.Wrapper41. DigitalIO ();
//ipreshut check tread
System.Threading. Thread ipreshutThread;
bool stopExecuting = false ;
public DigitalIOTest()
{
InitializeComponent();
this .C= new CancelEventHandler (DigitalIOTest_Closing);
ipreshutThread = new System.Threading. Thread ( new System.Threading. ThreadStart (CheckiPreShut));
ipreshutThread.Start();
}
void DigitalIOTest_Closing( object sender, CancelEventArgs e)
{
stopExecuting =
false ;
if (!ipreshutThread.Join(3000))
{
ipreshutThread.Abort();
}
}
private void CheckiPreShut()
{
bool shuttingDown = false ;
//check ipreshut every second
while (!stopExecuting)
{
shuttingDown = _digitalIO.DGRead(DigitalIO.Wrapper41.
DGIndex .IPRESHUT);
if (shuttingDown)
{
UpdForm();
//safe exit from the thread
break ;
}
System.Threading.
Thread .Sleep(1000);
}
}
private delegate void delUpdForm ();
private void UpdForm()
{
if (InvokeRequired)
{
this .BeginInvoke( new delUpdForm (UpdForm));
return ;
}
lblShutDownDetected.Visible =
true ;
}
}
}