Google距离矩阵最多可接受100个参数。但是使用GET Ruquest url lenth将其限制为< 15(我认为2048个字符),而不是错误414 - 请求的URL太大而无法处理。因此我得出结论,有必要使用POST方法。但我不能。我得到了REQUEST_DENIED的错误。那么我该如何使用这项服务?
public static bool GetMatrix(string origins, string destinations)
{
string poststring = string.Format("origins={0}&destinations={1}&mode=bicycling&language=fr-FR&sensor=false", origins, destinations);
byte[] postdata = Encoding.UTF8.GetBytes(poststring);
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("http://maps.googleapis.com/maps/api/distancematrix/xml");
webRequest.Method = "POST";
webRequest.ContentType = "application/xml"; // or any other type dont work
webRequest.ContentLength = postdata.Length;
using (Stream writer = webRequest.GetRequestStream())
writer.Write(postdata, 0, postdata.Length);
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
{
//Only for debug
using (var stream = new StreamReader(webResponse.GetResponseStream()))
System.Diagnostics.Debug.WriteLine(stream.ReadToEnd());
return (webResponse.StatusCode == HttpStatusCode.OK);
}
}
答案 0 :(得分:1)
JS方法
var origin1 = new google.maps.LatLng(55.930385, -3.118425);
var origin2 = "Greenwich, England";
var destinationA = "Stockholm, Sweden";
var destinationB = new google.maps.LatLng(50.087692, 14.421150);
var service = new google.maps.DistanceMatrixService();
service.getDistanceMatrix(
{
origins: [origin1, origin2],
destinations: [destinationA, destinationB],
travelMode: google.maps.TravelMode.DRIVING,
avoidHighways: false,
avoidTolls: false
}, callback);
function callback(response, status) {
// See Parsing the Results for
// the basics of a callback function.
}
在没有google.com的情况下计算距离的C#方法
public decimal calcDistance(decimal latA, decimal longA, decimal latB, decimal longB)
{
double theDistance = (Math.Sin(DegreesToRadians(latA)) *
Math.Sin(DegreesToRadians(latB)) +
Math.Cos(DegreesToRadians(latA)) *
Math.Cos(DegreesToRadians(latB)) *
Math.Cos(DegreesToRadians(longA - longB)));
return Convert.ToDecimal((RadiansToDegrees(Math.Acos(theDistance)))) * 69.09M * 1.6093M;
}