Question

我有一个获取用户坐标的Metro应用程序（WinJS），这是代码：

var loc = null;

function getloc() {
    if (loc == null) {loc = new Windows.Devices.Geolocation.Geolocator();}
    if (loc != null) {loc.getGeopositionAsync().then(getPositionHandler, errorHandler);}
}

function getPositionHandler(pos) {
    signatureAddressStrokeText.value = pos.coordinate.latitude + "," + pos.coordinate.longitude;
}

function errorHandler(e) {
    signatureAddressStrokeText.value = e.message + getStatusString(loc.locationStatus);
}

function getStatusString(locStatus) {
    switch (locStatus) {
        case Windows.Devices.Geolocation.PositionStatus.ready:
            return "Location is available.";
            break;
        case Windows.Devices.Geolocation.PositionStatus.initializing:
            // This status indicates that a GPS is still acquiring a fix
            return "A GPS device is still initializing.";
            break;
        case Windows.Devices.Geolocation.PositionStatus.noData:
            // No location data is currently available
            return "Data from location services is currently unavailable.";
            break;
        case Windows.Devices.Geolocation.PositionStatus.disabled:
            // The app doesn't have permission to access location,
            // either because location has been turned off.
            return "Your location is currently turned off. " +
                "Change your settings through the Settings charm " +
                " to turn it back on.";
            break;
        case Windows.Devices.Geolocation.PositionStatus.notInitialized:
            // This status indicates that the app has not yet requested
            // location data by calling GetGeolocationAsync() or
            // registering an event handler for the positionChanged event.
            return "Location status is not initialized because " +
                "the app has not requested location data.";
            break;
        case Windows.Devices.Geolocation.PositionStatus.notAvailable:
            // Location is not available on this version of Windows
            return "You do not have the required location services " +
                "present on your system.";
            break;
        default:
            break;
    }
}

这打印在我的textField（signatureAddressStrokeText）坐标上，但是我想通过使用这些坐标来获取位置地址字符串，我需要进行反向地理编码才能实现，但到目前为止我还没有找到关于这个主题的任何内容，如何在WinJS上进行反向地理编码？

提前感谢支持

编辑：由于WiredPrairie提供的Link，我可以让它工作，这是我生成的代码：

function webServiceReverseGeolocation(latitude, longitude) {
    return new WinJS.Promise(function (complete, error) {
        var options = {
            url:            "http://maps.googleapis.com/maps/api/geocode/xml?latlng=" + latitude + "," + longitude + "&sensor=true",
            responseType:   "document"
        };

        WinJS.Promise.timeout(constants.WEB_SERV_TIMEOUT, WinJS.xhr(options)).then(
            function (request) {
                var doc                             = request.responseXML.documentElement;
                var output                          = doc.getElementsByTagName("formatted_address");
                signatureAddressStrokeText.value    = output[0].textContent;
                complete(true);
            },

            function (error) {
                signatureAddressStrokeText.value = "Error getting location: " + error.status + "  " + error.statusText, "Status";
                complete(false);
            },

            function (progress) {
                signatureAddressStrokeText.value = "Getting current address from coordinates provided by GPS device... please wait";
            }

            );

    });
}

基本上是一个函数，需要经度和纬度，这打印在我的textField（signatureAddressStrokeText）从谷歌XML响应获得的完整地址

Answer 1

WinRT API没有内置任何内容，因此您需要使用第三方数据提供程序来查找。

例如，Microsoft在Bing地图中有一个选项：Find a Location by Point
Google也有一张地图：Geocoding

（我不确定是否有任何质量合理的免费选项。）

检查许可证以确保它们适合您的需要。例如，谷歌要求它只与谷歌地图一起使用（除非你也在用户界面上显示了谷歌地图，否则无法在上面显示的场景中使用）。

Answer 2

但我对WinJS一无所知......

您可以使用geonames托管自己的Node.js查找解决方案，或者从http://www.geonames.org获取API密钥

一个这样的模块，geonames（https://github.com/bugs181/geonames）托管在我的github上。
注意：我是geonames的作者。

它使用以下技术：node.js，mongojs，line-reader和geonames.org数据

如何在WinJS上进行反向地理编码

2 个答案: