Sometime ago, I published my modded GPS_Sample code (see here), which is based on a Microsoft GPSsample.

This time, I added support for Int*rm*c CN50, which does NOT support reading raw GPS data using a serial connection. Instead the CN50 streams the data to the ‘communication’ port.

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The stream reader part is outsourced into a thread, which is based on my background thread class bgThread2 (see this link). It was very easy to implement the stream reading within the thread, so the GUI is not blocked during read waits.

#region TheTHREAD
private void myThreadStart()
{
    System.Diagnostics.Debug.WriteLine("Entering thread proc");
    int _i=0;
    try
    {
        do
        {
            //The blocking function...
            char[] cSep = new char[] { '\r', '\n' };
            int iRes = 0;
            do
            {
                string sRes = "";
                iRes = GPS_Sample8.ReadFileClass.readFile(_sCOM, ref sRes);
                string[] sAll = sRes.Split(cSep);
                foreach (string s1 in sAll)
                {
                    SendData(bgWnd.Hwnd, iRes, s1);
                }
                //Application.DoEvents();
                Thread.Sleep(100);
            } while (iRes == 0);
            
            System.Diagnostics.Debug.WriteLine("Thread sleeps...");
            _i++;
            Thread.Sleep(100);
        } while (bRunThread);
    }
    catch (ThreadAbortException)
    {
        System.Diagnostics.Debug.WriteLine("Thread will abort");
        bRunThread = false;
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine("Exception in ThreadStart: " + ex.Message);
    }
    System.Diagnostics.Debug.WriteLine("ThreadProc ended");
}
#endregion

The main form code has some new functions to check for iCN50 and start/stop the stream reader background thread:

#region CN50raw
bgThread2 myStreamReaderThread;
private void OpenStream()
{
    //background thread already running?
    if (myStreamReaderThread == null)
    {
        string szPort="";
        szPort = GetGPSPort();
        if (szPort != "")
        {
            //start a new thread
            myStreamReaderThread = new bgThread2(szPort);
            myStreamReaderThread.bgThread2Event += 
	       new bgThread2.bgThread2EventHandler(myStreamReaderThread_bgThread2Event);
        }
        else
            AddRawText("No raw GPS port found");
    }
}

void myStreamReaderThread_bgThread2Event(object sender, bgThread2.BgThreadEventArgs bte)
{
    AddRawText(bte.sString);
}
private void CloseStream()
{
    if (myStreamReaderThread != null)
    {
        myStreamReaderThread.Dispose();
        Application.DoEvents();
        myStreamReaderThread = null;
    }
    Application.DoEvents();
    mnuRAWStart.Enabled = true;
    mnuRAWStop.Enabled = false;
}
#endregion

Download (VS2008 Solution Targeting WM6 SDK)

Download GPS C# sample code - 352.99 KB

Enhanced GPS Sample Update