ios - Application get crashed when create long distance path on Google Map -

i working on application want path between 2 locations. implemented code. fine short distance path when creating path long distance jaipur, rajasthan, india jorhat, aasam, india, application crashed.

this code

-(void)findpath{ [rectangle setmap:nil];   nsstring* str = [nsmutablestring stringwithformat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=true",  self.fromsearch, self.tosearch];  if (_travelmode==uicgtravelmodewalking) {     str=[str stringbyappendingformat:@"&mode=walking"]; }  nsurl *url=[[nsurl alloc]initwithstring:[str stringbyaddingpercentescapesusingencoding:nsutf8stringencoding]];  nsurlrequest *request = [nsurlrequest requestwithurl:url cachepolicy:nsurlrequestuseprotocolcachepolicy timeoutinterval:60.0];  nsdata *data = [nsurlconnection sendsynchronousrequest:request returningresponse:nil error:nil];  nserror* error; nsdictionary* json = [nsjsonserialization jsonobjectwithdata:data options:kniloptions error:&error];  nsarray* latestroutes = [json objectforkey:@"routes"];  nsstring *points=[[[latestroutes objectatindex:0] objectforkey:@"overview_polyline"] objectforkey:@"points"]; if ([latestroutes iskindofclass:[nsarray class]]&&latestroutes.count==0) {     uialertview *alrt=[[uialertview alloc]initwithtitle:@"alert" message:@"didn't find direction" delegate:nil cancelbuttontitle:@"ok" otherbuttontitles:nil, nil];     [alrt show];     return; } arrdistance =[[[json valueforkeypath:@"routes.legs.steps.distance.text"] objectatindex:0]objectatindex:0]; totalduration = [[[json valueforkeypath:@"routes.legs.duration.text"] objectatindex:0]objectatindex:0]; totaldistance = [[[json valueforkeypath:@"routes.legs.distance.text"] objectatindex:0]objectatindex:0]; arrdescription =[[[json valueforkeypath:@"routes.legs.steps.html_instructions"] objectatindex:0] objectatindex:0]; dictrouteinfo=[nsdictionary dictionarywithobjectsandkeys:totaldistance,@"totaldistance",totalduration,@"totalduration",arrdistance ,@"distance",arrdescription,@"description", nil]; double srclat=[[[[json valueforkeypath:@"routes.legs.start_location.lat"] objectatindex:0] objectatindex:0] doublevalue]; double srclong=[[[[json valueforkeypath:@"routes.legs.start_location.lng"] objectatindex:0] objectatindex:0] doublevalue]; totallat = [[nsmutablearray alloc]init]; totallong = [[nsmutablearray alloc]init];   //for (int = 0; i<arrdistance.count; i++) {     totallat = [[[json valueforkeypath:@"routes.legs.steps.start_location.lat"] objectatindex:0] objectatindex:0]; totallong = [[[json valueforkeypath:@"routes.legs.steps.start_location.lng"] objectatindex:0] objectatindex:0];  [self saveinfoforpath];   // }   cllocationcoordinate2d location; location.latitude = srclat; location.longitude = srclong;  // mapview.camera = [gmscameraposition camerawithtarget:location                                             //     zoom:10];   //gmscoordinatebounds *bounds = [[gmscoordinatebounds alloc]initwithpath:<#(gmspath *)#>]  // [[gmscoordinatebounds alloc] initwithcoordinate:vancouver coordinate:calgary];        @try {     // todo: better parsing. regular expression?      nsarray *temp= [self decodepolyline:[points mutablecopy]];      gmsmutablepath *path = [gmsmutablepath path];       for(int idx = 0; idx < [temp count]; idx++)     {         cllocation *location=[temp objectatindex:idx];          [path addcoordinate:location.coordinate];      }     // create polyline based on array of points.      rectangle = [gmspolyline polylinewithpath:path];      rectangle.strokewidth=5.0;      rectangle.map = mapview;     gmscoordinatebounds *bounds = [[gmscoordinatebounds alloc]initwithpath:path];     [mapview movecamera:[gmscameraupdate fitbounds:bounds]];   } @catch (nsexception * e) {     // todo: show error }    } 

decodepolyline() method coding

-(nsmutablearray *)decodepolyline: (nsmutablestring *)encoded { [encoded replaceoccurrencesofstring:@"\\\\" withstring:@"\\"                             options:nsliteralsearch                               range:nsmakerange(0, [encoded length])]; nsinteger len = [encoded length]; nsinteger index = 0; nsmutablearray *array = [[nsmutablearray alloc] init] ; nsinteger lat=0; nsinteger lng=0; while (index < len) {     nsinteger b;     nsinteger shift = 0;     nsinteger result = 0;     {         b = [encoded characteratindex:index++] - 63;         result |= (b & 0x1f) << shift;         shift += 5;     } while (b >= 0x20);     nsinteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));     lat += dlat;     shift = 0;     result = 0;     {         b = [encoded characteratindex:index++] - 63;         result |= (b & 0x1f) << shift;         shift += 5;     } while (b >= 0x20);     nsinteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));     lng += dlng;     nsnumber *latitude = [[nsnumber alloc] initwithfloat:lat * 1e-5] ;     nsnumber *longitude = [[nsnumber alloc] initwithfloat:lng * 1e-5] ;     printf("[%f,", [latitude doublevalue]);     printf("%f]", [longitude doublevalue]);     cllocation *loc = [[cllocation alloc] initwithlatitude:[latitude floatvalue] longitude:[longitude floatvalue]] ;     [array addobject:loc]; }  return array;   } 

what should do. please suggest.

you can try pathfromencodedpath method in place of decodepolyline getting path encodestring.

nsstring *points=[[[latestroutes objectatindex:0] objectforkey:@"overview_polyline"] objectforkey:@"points"]; polyline = [gmspolyline polylinewithpath: [gmspath pathfromencodedpath: points]]; polyline.map = mapview; polyline.strokecolor = [uicolor colorwithred:0/255.0 green:4/255.0 blue:255/255.0 alpha:1.0]; polyline.strokewidth = 4.0f;