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Enhanced GPS sample update

, 14 Jun 2010 CPOL
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The modded MS GPS_Sample application with the addition to support streamed serial raw GPS data like that available on Intermec CN50

Sometime ago, I published my modded GPS_Sample code (see http://www.hjgode.de/wp/2010/03/04/using-ws-geonames-org-timezone-webservice-without-wsdl/), 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 http://www.hjgode.de/wp/2010/06/01/mobile-development-easy-to-use-background-thread-with-gui-update/). 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)

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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hjgode

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Comments and Discussions

 
GeneralWhy some delay (not always) [modified] Pinmemberjozeunico27-Jul-12 8:46 
GeneralRe: Why some delay (not always) Pinmemberhjgode27-Jul-12 19:04 
GeneralRe: Why some delay (not always) Pinmemberjozeunico30-Jul-12 5:52 
GeneralRe: Why some delay (not always) Pinmemberhjgode30-Jul-12 6:52 
GeneralRe: Why some delay (not always) Pinmemberjozeunico30-Jul-12 8:14 
GeneralRe: Why some delay (not always) Pinmemberhjgode30-Jul-12 17:55 
GeneralRe: Why some delay (not always) Pinmemberhjgode21-Nov-12 4:54 
GeneralRe: Why some delay (not always) Pinmemberjozeunico21-Nov-12 4:58 

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