Geolocation in WinForms application

问题

I want to create a WinForms app that can detect location just like a web browser would using the javascript function navigator.geolocation.getCurrentPosition(showPosition);

Is there some way to do this in WinForms directly?

I thought that I might be able to use the WebBrowser control to do this but I don't believe this supports Geolocation (unless someone knows otherwise?)

Apparently the Gecko browser does support gelocation but this is not an option for me because client may have a different firefox version installed.

回答1:

You should use Geckofx

Also you need to ensure you exactly match the geckofx version with the correct xulrunner/firefox version.

GeoLocation doesn't yet have nice C# wrapper classes around it in geckofx, but you can access it using the xpcom C# interops.

    var instance = Xpcom.CreateInstance<nsIGeolocationProvider>("@mozilla.org/geolocation/provider;1");

回答2:

I haven't used it, but Microsoft has a Windows.Devices.Geolocation API, although it is for Windows 8.

For Windows 7, they seem to have a Sensor API, with some sample code here.

回答3:

Credit goes to the answer by Alex Filipovici given on this question: C# desktop application doesn't share my physical location

below is the code converted to VB:

WebServer Class:

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Net
Imports System.Text
Imports System.Threading

Public Class WebServer
    Private ReadOnly _listener As New HttpListener()
    Private Shared _staticContent As String

    Public Sub New(ByVal prefixes() As String, ByVal content As String)
        _staticContent = content
        For Each s As String In prefixes
            _listener.Prefixes.Add(s)
        Next s
        _listener.Start()
    End Sub

    Public Sub New(ByVal content As String, ByVal ParamArray prefixes() As String)
        Me.New(prefixes, content)
    End Sub

    Public Sub Run()
        ThreadPool.QueueUserWorkItem(Sub(o)
                                         Try
                                             Do While _listener.IsListening
                                                 ThreadPool.QueueUserWorkItem(Sub(c)
                                                                                  Dim ctx = TryCast(c, HttpListenerContext)
                                                                                  Try
                                                                                      Dim buf() As Byte = Encoding.UTF8.GetBytes(_staticContent)
                                                                                      ctx.Response.ContentLength64 = buf.Length
                                                                                      ctx.Response.OutputStream.Write(buf, 0, buf.Length)
                                                                                  Catch
                                                                                  Finally
                                                                                      ctx.Response.OutputStream.Close()
                                                                                  End Try
                                                                              End Sub, _listener.GetContext())
                                             Loop
                                         Catch
                                         End Try
                                     End Sub)
    End Sub

    Public Sub [Stop]()
        _listener.Stop()
        _listener.Close()
    End Sub

End Class

Form Code:

Imports System.Reflection
Imports System.Net
Imports System.Threading
Imports System.Text

Public Class Form1
    Dim _ws As WebServer
    Dim _webbrowser1 As WebBrowser

    Public Sub New()
        InitializeComponent()
        _webBrowser1 = New WebBrowser()
        _webBrowser1.Visible = False
        _webBrowser1.ScriptErrorsSuppressed = True
        Dim location = System.Reflection.Assembly.GetExecutingAssembly().Location
        _webBrowser1.Navigate(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) & "\test1.html")
        AddHandler _webBrowser1.DocumentCompleted, AddressOf webBrowser1_DocumentCompleted
    End Sub

    Async Sub webBrowser1_DocumentCompleted(sender As Object, e As WebBrowserDocumentCompletedEventArgs)
        If _ws Is Nothing Then
            Dim html = _webBrowser1.Document.GetElementsByTagName("html")
            Dim response = html(0).OuterHtml
            _ws = New WebServer(response, "http://localhost:9999/")
            _ws.Run()
            _webBrowser1.Navigate("http://localhost:9999/")
        Else
            Dim latitude As String = ""
            Dim longitude As String = ""

            Await Task.Factory.StartNew(Sub()
                                            While String.IsNullOrEmpty(latitude)
                                                System.Threading.Thread.Sleep(1000)

                                                If Me.InvokeRequired Then
                                                    Me.Invoke(DirectCast(Sub()
                                                                             Dim latitudeEl = _webbrowser1.Document.GetElementById("latitude")
                                                                             Dim longitudeEl = _webbrowser1.Document.GetElementById("longitude")

                                                                             latitude = latitudeEl.GetAttribute("value")
                                                                             longitude = longitudeEl.GetAttribute("value")

                                                                         End Sub, MethodInvoker))
                                                End If
                                            End While

                                        End Sub)
            txtLocation.Text = String.Format("{0},{1}", latitude, longitude)
        End If
    End Sub
End Class

test1.html file

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <meta http-equiv="X-UA-Compatible" content="IE=10" />
    <script type="text/javascript">
        window.onload = function () {
            var latitude = document.getElementById("latitude");
            var longitude = document.getElementById("longitude");

            function getLocation() {
                if (navigator.geolocation) {
                    navigator.geolocation.getCurrentPosition(showPosition);
                }
                else { }
            }
            function showPosition(position) {
                latitude.value = position.coords.latitude;
                longitude.value = position.coords.longitude;
            }
            getLocation();
        }
    </script>
</head>
<body>
    <input type="hidden" id="latitude" />
    <input type="hidden" id="longitude" />
</body>
</html>

来源：https://stackoverflow.com/questions/16716881/geolocation-in-winforms-application