Reverse Geo Code Lookup

Hi Ewan,

It works all right this side as you can see by the attached screen shot. Please attach a sample where it does not work.

Hi Ewan

I presume you mean a Google Maps error. Errors can have different origins:

• GoogleMaps itself
• GoogleMaps API
• Wisej.Web.Ext.GoogleMaps
• application itself

To exclude error origins, there are a number of things you can do.

First of all, are you checking Geocodes[0].IsError on your application?

Next thing, try to use these “certain locations” on GoogleMaps web page and on our GoogleMaps example on GitHub repository

Hi Tiago

I am getting the attached error, but only in certain locations

Any ideas?

Ewan

Hi Ewan,

The Wisej GoogleMaps is an extension for Wisej, meaning it’s intended to be shown on a web page (Wisej.Web.Page, Wisej.WebForm). So it won’t work unless you make it visible at least once. Making it visible forces the GoogleMap API scripts to load.

I attach back your solution with the following changes:

• Show Coords in a TextBox (for progress monitoring)
• Show GoogleMaps on page load and hide as soon as possible
• Auto fecth the address as soon as you get the coords
• callback use example

Hi Tiago

Aysnc sample attached

How do I use the sync version? Specifically insatiate Bb?

Map.GetGeocode(Bb, double.Parse(Latitude), double.Parse(Longitude));
Address = Bb[0].ToString();

Hi Ewan,

Please attach a sample.

Hi Tiago

I am missing something here – GeocoderResult[] never gets called

private string _lastQuery;
private GoogleMap Map = new GoogleMap();
private GeocoderResult[] _geocodes;

public string Address { get; private set; }
public GeocoderResult[] Geocodes
{
get { return _geocodes; }
private set
{
_geocodes = value;
}
}

private async void getAddress(string Latitude, String Longitude)
{
_lastQuery = $”Lat: {Latitude} Lng:{Longitude}”;
Geocodes = await Map.GetGeocodeAsync(double.Parse(Latitude), double.Parse(Longitude));
if (Geocodes[0].IsError)
{
MessageBox.Show($”Received error {Geocodes[0].ResultCode}”,
“Search Error”,
MessageBoxButtons.OK,
MessageBoxIcon.Error);
Geocodes = null;
}
else
{
Address = Geocodes[0].FormattedAddress;
}
}

Alternatively I think I need to call it synchronously.

Map.GetGeocode(Bb, double.Parse(Latitude), double.Parse(Longitude));
Address = Bb[0].ToString();

However how do I instantiate Action Bb?

Thanks

Ewan

Hi Tiago

Thanks.

I realised that I didn’t need Reverse Geocode as the data returned is usually based on the centre of a post code.

If instead I get the Site manager to capture the Latitude and Longitude at the Site itself, I can use this as a basis for comparison, moving forwards.

Tests show it is far more accurate that just getting the coordinates for a post code.

I want to be able to establish that when staff register their arrival at the Site they are actually there.

Hi Ewan,

Currently there is no support for Reverse Geoding in Web.Ext.GoogleMaps.GoogleMap

Support for Maps might change in the near future, following this thread about alternative maps libraries

I’ll register a feature request.

Hi Tiago

Yes I need to perform Reverse geocoding. Can a do this via the WiseJ Google Maps Extension?

Take a look at this:

https://www.w3schools.com/htmL/html5_geolocation.asp

Hi Ewan,

If I understand it correctly you want to perform Reverse geocoding right?