Read data from geoJson file in ios

Question

I'm trying to read data from geojson file using this code:

NSString *jsonPath = [[NSBundle mainBundle] pathForResource:@"roads_json" ofType:@"geojson"];

NSDictionary *json = [NSJSONSerialization JSONObjectWithData:[[NSData alloc]
                                                              initWithContentsOfFile:jsonPath]
                                                     options:0
                                                       error:nil];
NSLog(@"points:%@",json);

and the output:

points:(null)

any idea plz...

Are you sure the file contains proper json format...Are you getting any error in console... — Vizllx, May 12 '15 at 06:08
@vizllx yes ,the contains proper json format and no error in console... — Farid, May 12 '15 at 06:10
You are not passing an error object, how will you know whether ther is any error? — ZeMoon, May 12 '15 at 06:12
Is the jsonPath being set correctly, have you tried logging it? — ZeMoon, May 12 '15 at 06:52
@ashish kakkad this is json file link:http://txt.do/u7ht or http://textuploader.com/u7ht! — Farid, May 12 '15 at 07:03
@ZeMoon this is JsonPath: /private/var/mobile/Containers/Bundle/Application/7F2EE969-8750-4A0D-8BBB-FCD1FFF94F36/firstMapBox.app/roads_json.geojson — Farid, May 12 '15 at 07:21

score 1 · Accepted Answer · edited May 12 '15 at 06:12

1

It is always best to pass an NSError object when using NSJSONSerialization. This way you can know what exactly is wrong.

NSError *error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:[[NSData alloc]
                                                              initWithContentsOfFile:jsonPath]
                                                     options:0
                                                       error:&error];

if (error)
{
    NSLog(@"Could not serialize GeoJSON file: %@", [error localizedDescription]);
}
else
{
    //GeoJSON has been successfully decoded
}

edited May 12 '15 at 06:12

Ashish Kakkad

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answered May 12 '15 at 06:10

ZeMoon

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Could not serialize GeoJSON file: The operation couldn’t be completed. (Cocoa error 3840.) now this error show.. – Farid May 12 '15 at 06:17
It basically means that the JSON file is not proper. – ZeMoon May 12 '15 at 06:31
how i set the json file , jsonlint.com :Valid JSON – Farid May 12 '15 at 06:46
That's great. Could you post the contents of the GeoJSON file? – ZeMoon May 12 '15 at 06:47
At least a part of the content will do. – ZeMoon May 12 '15 at 06:48
Have you tried searching for the error yourself? http://stackoverflow.com/questions/11174130/ios-5-json-parsing-results-in-cocoa-error-3840 – ZeMoon May 12 '15 at 07:42

Read data from geoJson file in ios

1 Answers1