private void btnStartStop_Click(object sender, EventArgs e)
{
// do stuff depending on the text
switch (btnStartStop.Text)
{
case "Start":
{
// create a new Messages object and pass it into the PowerNotifications
// constructor
MessageList = new Messages();
// create the powernotifications object
pn = new PowerNotifications(ref MessageList);
pn.Start();
// start a timer to monitor the messages queue
if (timer1 == null)
timer1 = new System.Windows.Forms.Timer();
timer1.Interval = 250;
timer1.Tick += new EventHandler(ReadText);
timer1.Enabled = true;
btnStartStop.Text = "Stop";
}
break;
case "Stop":
// stop the thread
pn.Stop();
lstInfo.Items.Add("(" + System.DateTime.Now.ToString("hh:mm:ss") + ") stopping loop");
timer1.Enabled = false;
btnStartStop.Text = "Start";
break;
default:
break;
}
}
// Overloaded constructor that accepts a reference to the
// Messages object created by the form.
public PowerNotifications(ref Messages mList)
{
// assign the messages object
MessageList = mList;
// set up the Message queue options, create the queue
// and create a background thread to monitor it
MsgQOptions options = new MsgQOptions();
options.dwFlags = 0;
options.dwMaxMessages = 20;
options.cbMaxMessage = 10000;
options.bReadAccess = true;
options.dwSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(options);
ptr = CreateMsgQueue("Test", ref options);
IntPtr ptr2 = RequestPowerNotifications(ptr, 0xFFFFFFFF);
if (ptr2.Equals(IntPtr.Zero))
{
// error occurred
MessageList.AddMessage("Error with RPN");
}
t = new Thread(new ThreadStart(DoWork));
}