Hey Guys ,I have made some previous posts for this problem but hasn't got a reply yet, I did some poking around and found these UID things ... See in the code All I want is the form (desktop windows application) to show a specific map and display the gps point on the map, when i move the point should move to the new spot no tracing required , and Form some archive forum I found some codes that i put together for this project....I get this error ""System.NullReferenceException was caught
Message="Object reference not set to an instance of an object."
Source="ndkj"
StackTrace:
at ndkj.Form1.Detectgps_Click(Object sender, EventArgs e) in C:\Users\Balu\Documents\Visual Studio 2008\Projects\ndkj\ndkj\Form1.cs:line 80
InnerException: ""
then here is the code I have private void Form1_Load(object sender, EventArgs e)
{
myap = this.mapControl1 as IApplication;
//initialize the real-time manager
UID pUID = new UIDClass();
pUID.Value = "{C994BFE6-47F1-4BAC-8F35-0743C7576673}";
myap = null;
m_gpsExt = myap.FindExtensionByCLSID(pUID) as IGpsExtension;
}
private void Detectgps_Click(object sender, EventArgs e)
{
#region example from EDN forum
IGpsDisplayProperties pGpsDisplay;
g_pFeedManager = new RealTimeFeedManagerClass();
g_pFeedManager.GpsFeed.Connection.BaudRate=Convert.ToInt16( esriGpsBaudRate.esriGpsBaudRate38400);
g_pFeedManager.GpsFeed.Connection.CommPort = 5;
g_pFeedManager.GpsFeed.Connection.DataBits = 8;
g_pFeedManager.GpsFeed.Connection.Parity = esriGpsParity.esriGpsParityNone;
g_pFeedManager.GpsFeed.Connection.StopBits = esriGpsStopBits.esriGpsStopBits1;
//esriGpsConnectionStatus status = g_pFeedManager.GpsFeed.TestStatus;
//g_pFeedManager.RealTimeFeed = (IRealTimeFeed)g_pFeedManager.GpsFeed;
try
{
pGpsDisplay = (IGpsDisplayProperties)g_pFeedManager;
pGpsDisplay.AutoPan = true;
mapControl1 = new MapControlClass();
g_pFeedManager.Map = this.mapControl1.Map;
// g_pFeedManager.RealTimeFeed.Start();
#endregion
//m_gpsExt = new
g_pFeedManager = m_gpsExt.RealTimeFeedManager;
m_realTimeFeed = g_pFeedManager.RealTimeFeed;
((IRealTimeFeedEvents_Event)m_realTimeFeed).PositionUpdated += new IRealTimeFeedEvents_PositionUpdatedEventHandler(Form1_PositionUpdated);
if (m_realTimeFeed.Status == esriGpsConnectionStatus.esriGpsConnectionStatusClosed)
m_realTimeFeed.Start();
}
catch(Exception ex)
{
Console.Write("COM Error:" + ex.Message);
}
the error occured in this " g_pFeedManager = m_gpsExt.RealTimeFeedManager;"For The Fix I tried if(null == m_gpsExt) and got same error so ,I tried to add m_gpsExt = new GpsExtension Class();and I got the red underline thingy and the pop up error said " References to non-creatable objects must be obtained through other objects. "Please Find the attached File and PLEASE HELP I Greatly Appreciate your time on this Thanks In Advance