/// <summary>
/// Queries the device state.
/// </summary>
/// <returns>Device state information</returns>
internal GpsDeviceState GetDeviceState()
{
GpsDeviceState device = null;
// allocate a buffer on the native side. Since the
IntPtr pGpsDevice = Utils.LocalAlloc(GpsDeviceState.GpsDeviceStructureSize);
// GPS_DEVICE structure has arrays of characters, it's easier to just
// write directly into memory rather than create a managed structure with
// the same layout.
Marshal.WriteInt32(pGpsDevice, 1); // write out GPS version of 1
Marshal.WriteInt32(pGpsDevice, 4, GpsDeviceState.GpsDeviceStructureSize); // write out dwSize of structure
int result = GPSGetDeviceState(pGpsDevice);
if (result == 0)
{
// instantiate the GpsDeviceState class passing in the native pointer
device = new GpsDeviceState(pGpsDevice);
}
// free our native memory
Utils.LocalFree(pGpsDevice);
return(device);
}
public DeviceStateChangedEventArgs(GpsDeviceState deviceState)
{
this.deviceState = deviceState;
}