QueryByDistanceService

Distance查询服务类构造函数。

例如：

QueryByDistanceService* ps = [[QueryByDistanceService alloc] init:@"http://support.supermap.com.cn:8090/iserver/services/map-world/rest/maps/World"];
FilterParameter* pF = [[FilterParameter alloc] init];
pF.name = [[NSString alloc] initWithString:@"Capitals@World.1"];
RMPath* pPoint = [[RMPath alloc] initWithContents:mapContents];
CLLocationCoordinate2D mPoint;
mPoint.latitude = 31;
mPoint.longitude = 121;
[pPoint moveToLatLong:mPoint];
QueryByDistanceParameters* p = [[QueryByDistanceParameters alloc] init:30 mGeometry:pPoint bNearest:false];
[p.queryParams addObject:pF];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(processCompleted:) name:@"processCompleted" object:nil];
[ps processAsync:p];