How to solve this EXC_BAD_ACCESS(code=EXC_i386_GPFLT )in swift programming

Question

this is my code.getting this EXC_BAD_ACCESS(code=EXC_i386_GPFLT).I don'n know how to find and solve plz help me ...application getting crash when get longitude

mapServerRequest="Hyderabad,india"
var mapAddress:NSString=mapServerRequest
mapAddress.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLPathAllowedCharacterSet())
     println(mapAddress)
var urlpath=NSString(format: "http://maps.googleapis.com/maps/api/geocode/json?address=%@", mapAddress)
     println(urlpath)
var url = NSURL.URLWithString(urlpath)
    println(url)
var jsonData:NSData=NSData(contentsOfURL:url)

       if(jsonData != nil)
    {
        var error:NSError=NSError(coder: nil)
        var result:NSDictionary=NSJSONSerialization .JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
        //println(result)
        if (error != nil)
        {
            mapServerResultArray=result.valueForKey("results") as NSMutableArray
           // println(mapServerResultArray)

        }
      var longitud:NSString

           longitud=mapServerResultArray.objectAtIndex(0).valueForKey("geometry").valueForKey("location").valueForKey("lng")as NSString

        var latitud :NSString = (mapServerResultArray .objectAtIndex(0).valueForKey("geometry").valueForKey("location").valueForKey("lat")) as NSString
        placeName=mapServerResultArray .objectAtIndex(0).valueForKey("formatted_address") as NSString
        var longitude:Float=longitud.floatValue
        var latitude:Float=latitud.floatValue
        self.zoomMapAndCenterAtLatitude(latitude)
        self.zoomMapAndCenterAtLongitud(longitude) 

Answer 1

Short answer:

enable Zombies in the Scheme and it will enable a breakpoint and proper reason will be displayed in the logs

Technical reason:

You are trying to do something which in not allowed in the architecture refer this What's the meaning of exception code "EXC_I386_GPFLT"?

Answer 2

Your problem here is that most of the operations you are performing can return nil, which will crash Swift if you try and use it as a non-nil value. You need to be explicit about testing for nil. The sledgehammer way of doing it would be

let mapAddress = "Hyderabad,india"

let url = NSURL.URLWithString("http://maps.googleapis.com/maps/api/geocode/json?address=\(mapAddress)")

let jsonData = NSData(contentsOfURL:url)

var latitude = NSNumber(double: 0.0)
var longitude = NSNumber(double: 0.0)
var success = false

if jsonData != nil {
    if let result = NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as? NSDictionary {
        if let mapServerResultArray = result.valueForKey("results") as? NSArray {
            if let geometry = mapServerResultArray[0].valueForKey("geometry") as? NSDictionary {
                if let location = geometry.valueForKey("location") as? NSDictionary {
                    if let lat = location.valueForKey("lat") as? Float {
                        latitude = lat
                        if let lng = location.valueForKey("lng") as? Float {
                            longitude = lng
                            success = true
                        }
                    }
                }
            }
        }
    }
}
if success {
    println("Latitude = \(latitude), longitude=\(longitude)")
} else {
    println("Failed")
}

... however that is ugly. As this routine may or may not find any of the keys, at the end you may or may not have a valid pair of coordinates. This is exactly what Optionals are for. Consider rewriting it as a function that returns an optional:

struct Coordinate { // Or use any of Cocoa's similar structs
    var latitude: Double
    var longitude: Double
}

func getCoordsOf(#address: String) -> Coordinate? {
    let url = NSURL.URLWithString("http://maps.googleapis.com/maps/api/geocode/json?address=\(address)")
    let jsonData = NSData(contentsOfURL:url)
    if jsonData == nil { return nil }

    let result = NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
    if result == nil { return nil }

    if let geometry = result.valueForKey("results").valueForKey("geometry") as? NSArray {
        if geometry.count > 0 {
            let lat = geometry[0].valueForKey("location")?.valueForKey("lat")?.doubleValue
            let lng = geometry[0].valueForKey("location")?.valueForKey("lng")?.doubleValue

            if (lat != nil) && (lng != nil) {
                return Coordinate(latitude: lat!, longitude: lng!)
            }
        }
    }
    return nil
}

if let coord = getCoordsOf(address: "Hyderabad,india") {
    // ... do something
}

This uses Optional Chaining (?) to lessen the testing, but we have to break it at geometry because we need that to be an array, as we need to access a specific element of it (and, of course, should test that it isn't an empty array!)

p.s. - ironically, your test on error != nil does nothing, as you did not send error to the JSONObjectWithData routine.

Answer 3

In that type of situation you can convert latitude to string. Updated code:

 mapServerRequest="Hyderabad,india"
    var mapAddress:NSString=mapServerRequest
    mapAddress.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLPathAllowedCharacterSet())
         println(mapAddress)
    var urlpath=NSString(format: "http://maps.googleapis.com/maps/api/geocode/json?address=%@", mapAddress)
         println(urlpath)
    var url = NSURL.URLWithString(urlpath)
        println(url)
    var jsonData:NSData=NSData(contentsOfURL:url)

           if(jsonData != nil)
        {
            var error:NSError=NSError(coder: nil)
            var result:NSDictionary=NSJSONSerialization .JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
            //println(result)
            if (error != nil)
            {
                mapServerResultArray=result.valueForKey("results") as NSMutableArray
               // println(mapServerResultArray)

            }
          var longitud:NSString

               longitud=NSString(format:mapServerResultArray.objectAtIndex(0).valueForKey("geometry").valueForKey("location").valueForKey("lng"))
            var latitud :NSString
 latitud=NSString(format:(mapServerResultArray .objectAtIndex(0).valueForKey("geometry").valueForKey("location").valueForKey("lat")))
            placeName=NSString(format:mapServerResultArray .objectAtIndex(0).valueForKey("formatted_address"))
            var longitude:Float=longitud.floatValue
            var latitude:Float=latitud.floatValue
            self.zoomMapAndCenterAtLatitude(latitude)
            self.zoomMapAndCenterAtLongitud(longitude)