asp.net - Cant get Values from JSON Webservice -

i have webservice, picks data database ans send them in json iphone

my webservice:

[scriptmethod(responseformat = responseformat.json)]        [webmethod]        public string person()        {            return helper.person();        } 

my helper.cs

public class helper {    internal static string person()    {        list<object> person = new list<object>();         using (sqlconnection con = new sqlconnection(@"data source=localhost\sqlexpress;initial catalog=book-it-v2;integrated security=true;"))        using (sqlcommand cmd = new sqlcommand(@"select email person", con))        {            con.open();            using (sqldatareader rdr = cmd.executereader())            {                while (rdr.read())                {                    if (rdr["email"] != dbnull.value)                    {                        raumklassenobject.add(new {                            email=rdr["email"].tostring()});                    }                }            }        }         return new javascriptserializer().serialize(person.toarray());    } } 

in xcode:

  #import "raumklasseviewcontroller.h"  @interface raumklasseviewcontroller ()  @end  @implementation raumklasseviewcontroller @synthesize result; @synthesize dic; @synthesize array;    - (id)initwithstyle:(uitableviewstyle)style {     self = [super initwithstyle:style];     if (self) {         // custom initialization     }     return self; } - (void) sendrequest:(nsstring*)jsontext {     nsurl *url = [[nsurl alloc]initwithstring:@"http://ndqqxtsdsdoludwons-entwickludng.de/webdiendst22/service1.asmx/raumklasse"];     nsmutableurlrequest *request = [[nsmutableurlrequest alloc] init];     request = [nsmutableurlrequest requestwithurl:url cachepolicy:nsurlrequestuseprotocolcachepolicy timeoutinterval:10];     [request sethttpmethod: @"post"];     [request setvalue:@"application/json" forhttpheaderfield:@"content-type"];     nsdata *reqdata = [nsdata datawithbytes:[jsontext utf8string] length:[jsontext length]];     [request sethttpbody:reqdata];     nsurlresponse *response =[[nsurlresponse alloc]init];     nserror* error;     result = [nsurlconnection sendsynchronousrequest:request returningresponse:&response error:&error];  } - (void)viewdidload  {     [super viewdidload];     [self sendrequest:@""];     dic = [nsjsonserialization jsonobjectwithdata:result options:kniloptions error:nil];      self.array= [dic objectforkey:@"d"];      nsmutablearray *finalarray = [[nsmutablearray alloc] init];     for(int n=0; n<[self.array count]; n++)         [finalarray addobject:[[self.array objectatindex:n] objectforkey:@"email"]];  } - (void)viewdidunload {     [super viewdidunload];   }  - (bool)shouldautorotatetointerfaceorientation:(uiinterfaceorientation)interfaceorientation {     return (interfaceorientation == uiinterfaceorientationportrait); } #pragma mark - table view data source  - (nsinteger)numberofsectionsintableview:(uitableview *)tableview {      // return number of sections.     return 1; }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {       return [self.array count];  }  - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     static nsstring *cellidentifier = @"cell";     uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     if (cell == nil) {         cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];     }     cell.textlabel.text=[array objectatindex:indexpath.row];      return cell;   }    @end 

so far works , output is:

[{"email":"abcd@web.de"},{"email":"acsb@web.de"},{"email":"asbd@gmx.de"},{"email":"abcdw@web.de"},{"email":"absds@web.de"}] 

but if try

self.array = [[dic objectforkey:@"d"] objectforkey:@"email"]; 

to values : abcd@web.de, acsb@web.de, asbd@gmx.de etc.

so iam getting error:

 [__nscfstring objectforkey:]: unrecognized selector sent instance 0x6a4ccb0. 

i think webservice returning wrong. , dont know what. maybe can me.

thank in advance.

you have array of dictionaries 1 single key in each dictionary ("email").

objectforkey: method returns object key in dictionary.

you can not call method on array receiving [dic objectforkey:@"d"] because method not work on arrays.

instead use objectatindex: this:

self.array = [dic objectforkey:@"d"]; nsmutablearray *finalarray = [[nsmutablearray alloc] init]; for(int n=0; n<[self.array count]; n++)     [finalarray addobject:[[self.array objectatindex:n] objectforkey:@"email"]]; 

once done running finalarray contain array of strings of email addresses only.