Question

我使用代码从google方向api解析坐标和折线：

-(void)routeParser:(NSString *)sourceAddress andDestination:(NSString *)destinationAddress{
    NSLog(@"des sour %@",sourceAddress);
    NSError *error = nil;

    NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false", sourceAddress, destinationAddress];
    //&alternatives=true
    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];
    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error];
    NSLog(@"apiResponse %@",apiResponse);
    SBJsonParser *jsonParser = [SBJsonParser new];
    NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:apiResponse];
    NSLog(@"apiResponse is : %@",[jsonData objectForKey:@"routes"]);
    NSArray *routeArray = [[NSArray alloc]init];
    routeArray= [jsonData objectForKey:@"routes"];

    for(int i=0;i<[routeArray count];i++)
    {
        NSDictionary *tempDictionary = [routeArray objectAtIndex:i];
        if([tempDictionary objectForKey:@"overview_polyline"]!=nil)
        {
            NSDictionary *secTempDictionary = [tempDictionary objectForKey:@"overview_polyline"];
            if([secTempDictionary objectForKey:@"points"]!=nil)
            {
                NSString * routePoint =[secTempDictionary objectForKey:@"points"];

                [routeSetAry addObject:routePoint];

                encodedPoints = [secTempDictionary objectForKey:@"points"];
            }
            // NSLog(@"secTempDictionary is: %@", secTempDictionary);
        }
        if([tempDictionary objectForKey:@"legs"]!=nil)
        {
            NSArray *lagArray = [[NSArray alloc]init];
            lagArray= [tempDictionary objectForKey:@"legs"];

            for(int i=0;i<[lagArray count];i++)
            {
                NSDictionary *thirdTempDictionary = [lagArray objectAtIndex:i];
                if([thirdTempDictionary objectForKey:@"steps"]!=nil)
                {
                    NSArray *stepsArray = [[NSArray alloc]init];
                    stepsArray= [thirdTempDictionary objectForKey:@"steps"];

                    for(int i=0;i<[stepsArray count];i++)
                    {
                        NSDictionary *forthTempDictionary = [stepsArray objectAtIndex:i];

                        if([forthTempDictionary objectForKey:@"html_instructions"]!=nil)
                        {
                            NSString * directionStr =[forthTempDictionary objectForKey:@"html_instructions"];

                            NSRange range;
                            while ((range = [directionStr rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound){
                                directionStr=[directionStr stringByReplacingCharactersInRange:range withString:@""];
                            }
                            [directionStrAry addObject:directionStr];
                        }

                        NSDictionary *fifthTempDictionary = [forthTempDictionary objectForKey:@"polyline"];
                        if([fifthTempDictionary objectForKey:@"points"]!=nil)
                        {
                            NSString * routePoint =[fifthTempDictionary objectForKey:@"points"];

                            [polylineSetAry addObject:routePoint];

                            // encodedPoints = [fifthTempDictionary objectForKey:@"points"];
                        }
                        NSDictionary *sixthTempDictionary =[forthTempDictionary objectForKey:@"distance"];
                        if([sixthTempDictionary objectForKey:@"text"]!=nil)
                        {
                            NSString * distanceStr =[sixthTempDictionary objectForKey:@"text"];

                            [distanceStrAry addObject:distanceStr];

                            // encodedPoints = [fifthTempDictionary objectForKey:@"points"];
                        } 
                    }
                }
            }
        }  
    }

    NSLog(@"routeSetAry is :%@",routeSetAry);
    NSLog(@"polylineSetAry is : %i",polylineSetAry.count);

}

但问题是它记录为null并在开头返回null apiResponse。我的错在哪里，我无法理解，有人帮忙吗？

Answer 1

{{1}}

希望这可以帮助你...

Answer 2

Google拒绝通过客户端脚本进行访问。您需要处理该服务器端以下载json数据并将json结果传递给客户端。

更新

string Origin =“Chennai，Tamil Nadu，India”; string Destination =“Bangalore，Karnataka，India”;

            var geojsonurl = "http://maps.googleapis.com/maps/api/directions/json?origin=" + Origin  + "&destination=" + Destination + " &sensor=true";

            WebClient c = new WebClient();
            var json = c.DownloadString(geojsonurl);
            GoogleMapsRoutes data = JsonConvert.DeserializeObject<GoogleMapsRoutes>(json);

            StringBuilder Originstrlatlng = new StringBuilder();
            StringBuilder Deststrlatlng = new StringBuilder();

            if (!(data == null))
            {
                foreach (var item in data.routes[0].legs[0].steps)
            {
                Originstrlatlng.Append (item.start_location.lat.ToString() + "," + item.start_location.lng.ToString() + "|");
                Deststrlatlng.Append(item.end_location.lat.ToString() + "," + item.end_location.lng.ToString() + "|");
            }
            }


public class GoogleMapsRoutes
{
    public List<Route> routes { get; set; }
    public string status { get; set; }

}

public class Northeast
{
    public double lat { get; set; }
    public double lng { get; set; }
}

public class Southwest
{
    public double lat { get; set; }
    public double lng { get; set; }
}

public class Bounds
{
    public Northeast northeast { get; set; }
    public Southwest southwest { get; set; }
}

public class Distance
{
    public string text { get; set; }
    public int value { get; set; }
}

public class Duration
{
    public string text { get; set; }
    public int value { get; set; }
}

public class EndLocation
{
    public double lat { get; set; }
    public double lng { get; set; }
}

public class StartLocation
{
    public double lat { get; set; }
    public double lng { get; set; }
}

public class Distance2
{
    public string text { get; set; }
    public int value { get; set; }
}

public class Duration2
{
    public string text { get; set; }
    public int value { get; set; }
}

public class EndLocation2
{
    public double lat { get; set; }
    public double lng { get; set; }
}

public class Polyline
{
    public string points { get; set; }
}

public class StartLocation2
{
    public double lat { get; set; }
    public double lng { get; set; }
}

public class Step
{
    public Distance2 distance { get; set; }
    public Duration2 duration { get; set; }
    public EndLocation2 end_location { get; set; }
    public string html_instructions { get; set; }
    public Polyline polyline { get; set; }
    public StartLocation2 start_location { get; set; }
    public string travel_mode { get; set; }
    public string maneuver { get; set; }
}

public class Leg
{
    public Distance distance { get; set; }
    public Duration duration { get; set; }
    public string end_address { get; set; }
    public EndLocation end_location { get; set; }
    public string start_address { get; set; }
    public StartLocation start_location { get; set; }
    public List<Step> steps { get; set; }
    public List<object> via_waypoint { get; set; }
}

public class OverviewPolyline
{
    public string points { get; set; }
}

public class Route
{
    public Bounds bounds { get; set; }
    public string copyrights { get; set; }
    public List<Leg> legs { get; set; }
    public OverviewPolyline overview_polyline { get; set; }
    public string summary { get; set; }
    public List<object> warnings { get; set; }
    public List<object> waypoint_order { get; set; }
}

这很有效。试试吧。

如何从iPhone中的谷歌地图解析谷歌方向api数据？

2 个答案: