在 Windows Phone 8 中跟踪位置时出现异常

Posted 2023-02-23

【中文标题】在 Windows Phone 8 中跟踪位置时出现异常

【英文标题】：Exception while tracking location in Windows Phone 8

【发布时间】：2013-09-11 21:51:19

【问题描述】：

当我尝试跟踪位置时，它工作得很好，但是当我向它添加服务引用时，它会引发异常 当我在不添加位置的情况下尝试相同的程序时，只添加服务引用它完美地工作 我的代码在下面，同时从How to continuously track the phone's location for Windows Phone 8复制而来

public partial class MainPage : PhoneApplicationPage


    Geolocator geolocator = null;
    bool tracking = false;
    ServiceReference2.GetPositionClient client = new ServiceReference2.GetPositionClient();
    // Constructor
    public MainPage()
    
        InitializeComponent();

        // Sample code to localize the ApplicationBar
        //BuildLocalizedApplicationBar();
    
    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    
        if (IsolatedStorageSettings.ApplicationSettings.Contains("LocationConsent"))
        
            // User has opted in or out of Location
            return;
        
        else
        
            MessageBoxResult result =
                MessageBox.Show("This app accesses your phone's location. Is that ok?",
                "Location",
                MessageBoxButton.OKCancel);

            if (result == MessageBoxResult.OK)
            
                IsolatedStorageSettings.ApplicationSettings["LocationConsent"] = true;
            
            else
            
                IsolatedStorageSettings.ApplicationSettings["LocationConsent"] = false;
            

            IsolatedStorageSettings.ApplicationSettings.Save();
        
    
    private void TrackLocation_Click(object sender, RoutedEventArgs e)
    
        if ((bool)IsolatedStorageSettings.ApplicationSettings["LocationConsent"] != true)
        
            // The user has opted out of Location.
            return;
        

        if (!tracking)
        
            geolocator = new Geolocator();
            geolocator.DesiredAccuracy = PositionAccuracy.High;
            geolocator.MovementThreshold = 100; // The units are meters.

            geolocator.StatusChanged += geolocator_StatusChanged;
            geolocator.PositionChanged += geolocator_PositionChanged;

            tracking = true;
            TrackLocationButton.Content = "stop tracking";
        
        else
        
            geolocator.PositionChanged -= geolocator_PositionChanged;
            geolocator.StatusChanged -= geolocator_StatusChanged;
            geolocator = null;

            tracking = false;
            TrackLocationButton.Content = "track location";
            StatusTextBlock.Text = "stopped";
        
    
    void geolocator_StatusChanged(Geolocator sender, StatusChangedEventArgs args)
    
        string status = "";

        switch (args.Status)
        
            case PositionStatus.Disabled:
                // the application does not have the right capability or the location master switch is off
                status = "location is disabled in phone settings";
                break;
            case PositionStatus.Initializing:
                // the geolocator started the tracking operation
                status = "initializing";
                break;
            case PositionStatus.NoData:
                // the location service was not able to acquire the location
                status = "no data";
                break;
            case PositionStatus.Ready:
                // the location service is generating geopositions as specified by the tracking parameters
                status = "ready";
                break;
            case PositionStatus.NotAvailable:
                status = "not available";
                // not used in WindowsPhone, Windows desktop uses this value to signal that there is no hardware capable to acquire location information
                break;
            case PositionStatus.NotInitialized:
                // the initial state of the geolocator, once the tracking operation is stopped by the user the geolocator moves back to this state

                break;
        

        Dispatcher.BeginInvoke(() =>
        
            StatusTextBlock.Text = status;
        );
    





    void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
    
        client.getPosCompleted += new EventHandler<ServiceReference2.getPosCompletedEventArgs>(sendData);

        client.getPosAsync(11,11);


        Dispatcher.BeginInvoke(() =>
        
            LatitudeTextBlock.Text = args.Position.Coordinate.Latitude.ToString("0.00");
            LongitudeTextBlock.Text = args.Position.Coordinate.Longitude.ToString("0.00");
        );
    


    public void sendData(object sender, ServiceReference2.getPosCompletedEventArgs e)
    

        dd.Text = e.Result;

    
    

【问题讨论】：

它会抛出什么异常？

【参考方案1】：

你有

client.getPosCompleted += new EventHandler<ServiceReference2.getPosCompletedEventArgs>(sendData);

但您没有在其他任何地方为 Client 提供任何值，我假设您收到 null Reference 异常，这就是原因。

【讨论】：

client.getPosCompleted += new EventHandler(sendData); client.getPosAsync(11,11);

我用这个...我有一个异常“远程服务器返回错误：未找到”..

请将该异常添加到问题中，以便我们更好地解决问题。

刚刚解决了只是设置iis的问题，因为手机和pc在不同的网络上，所以无法通信。我只是在路由器设置中转发端口

【参考方案2】：

刚刚解决了，是IIS设置的问题，因为手机和电脑在不同的网络，所以无法通信。我只是在路由器设置中转发端口-