I'm parsing an XML and saving result to NSMutableArray. When I do NSLog,
NSLog(#"Data : %#",_data);
I'm getting
Data : (
{
SessionToken = 9e72dd029e0e8268380b919356881935;
}
)
I only want 9e72dd029e0e8268380b919356881935 from the array. What is the best solution to achieve this?
EDIT : There will be only one SessionToken at a time.
You can try this code :
for (NSDictionary *data1 in _data) {
NSlog("session token %#",[data1 objectForKey:#"SessionToken"]);//Other wise add into another array which contain session token.. only..
}
Since there will be only one session at a time.
NSDictionary *session = [_data lastObject];
NSString *sessionToken = session[#"SessionToken"];
OR with literals
NSString *sessionToken = _data[0][#"SessionToken"];
if ([_data count]) {
NSDictionary *dic = [_data objectAtIndex:0];
NSLog(#"Data : %#",[dic objectForKey:#"SessionToken"]);
}
for (NSDictionary *data1 in _data) {
NSlog("session token %#",[data1 valueForKey:#"SessionToken"]);
}
Related
I am trying to wrap my head around pulling a keys value from a JSON array and saving it as a String for comparison later: The following code makes my app crash when it gets to this section of code. I don't understand why.
My json array looks like so:
[{"User_Id":"CRNA000099","User_Name":"jbliz","User_Fname":"Julia"}]
My xcode:
userarray_login = [NSJSONSerialization JSONObjectWithData:dataURL options:kNilOptions error:&error];
NSDictionary* userType = [userarray_login objectForKey:#"User_Name"];
NSString *userPermission = [userType objectAtIndex:0];
if ([userPermission isEqualToString:#"jbliz"])
{
NSLog(#"I should get the avalue here: %#", userPermission);
}
I am confused between NSDictionary and NSString. Any feedback would be a
NSMutableArray *name=[[[NSMutableArray alloc] initWithArray:[userarray_login valueForKey:#"User_Name"]]retain];
// Get the only all Names into name Array from json Array
NSString *userPermission = [name objectAtIndex:0]; // get the first name from Array
if ([userPermission isEqualToString:#"jbliz"])
{
NSLog(#"I should get the avalue here: %#", userPermission);
}
Json Array : [{"User_Id":"CRNA000099","User_Name":"jbliz","User_Fname":"Julia"},{},...] an array contains Dictionaries.
for this try like,
NSArray * userarray_login = [NSJSONSerialization JSONObjectWithData:dataURL options:kNilOptions error:&error];
for (NSDictionary * dict in userarray_login) {
NSString * name = [dict objectForKey:#"User_Name"];
if ([name isEqualToString:#"jbliz"]) {
NSLog(#"Value is here: %#", name);
}
}
Your json has array of Dictionary you need to follow below steps,
//NSJSONSerialization return you array in userarray_login
userarray_login = [NSJSONSerialization JSONObjectWithData:dataURL options:kNilOptions error:&error];
//You fetch Dictionary from the array
NSDictionary* userType = [userarray_login objectAtIndex:0];
//Fetch NSString value using keyValue
NSString *userPermission = [userType objectForKey:#"User_Name"];
//String comparison
if ([userPermission isEqualToString:#"jbliz"])
{
NSLog(#"I should get the avalue here: %#", userPermission);
}
This is correct code for your stuff.
I have JSON like this:
[{"ID" : "351", "Name" : "Cam123 ", "camIP" : "xxx.xxx.xxx.xxx",
"Username" : "admin", "Password" : "damin", "isSupportPin" : "1" },
{"ID" : "352", "Name" : "Cam122 ", "camIP" : "xxx.xxx.xxx.xxx",
"Username" : "admin", "Password" : "damin", "isSupportPin" : "0" }
]
I want to get isSupportPin with result: 1 or 0.
if (x == 1)
{
mybutton.enabled = TRUE;
}
else
{
mybutton.enabled = FALSE;
}
How I can do it?
Assuming you have an NSData object with this data in it:
// Your JSON is an array, so I'm assuming you already know
// this and know which element you need. For the purpose
// of this example, we'll assume you want the first element
NSData* jsonData = /* assume this is your data from somewhere */
NSError* error = nil;
NSArray* array = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
if( !array ) {
// there was an error with the structure of the JSON data...
}
if( [array count] > 0 ) {
// we got our data in Foundation classes now...
NSDictionary* elementData = array[0]; // pick the correct element
// Now, extract the 'isSupportPin' attribute
NSNumber* isSupportPin = elementData[#"isSupportPin"];
// Enable the button per this item
[mybutton setEnabled:[isSupportPin boolValue]];
} else {
// Valid JSON data, but no elements... do something useful
}
The above example code snippet assumes you know which element you want to read (I guess these are user lines or something) and that you know what the JSON attribute names are (e.g., if isSupportPin isn't actually defined in the JSON object returned in that array, it will simply return nil, which will always evaluate to NO when you send it -boolValue).
Finally, the above code is written for ARC and requires Xcode 4.5 or Clang 4.1 and a deployment target of iOS 5.0. If you're not using ARC, building with a legacy version of Xcode, or targeting something earlier than 5.0, you'll have to adjust the code.
Here what you have is an NSArray of NSDictionarys. So using SBJSON library you could do as following
SBJsonParser *parser = [SBJsonParser alloc] init];
NSArray *data = [parser objectFromString:youJson];
for (NSDictionary *d in data)
{
NSString *value = [d objectForKey:#"Name"];
}
The library can be found at http://stig.github.com/json-framework/
Follow the below link that my help you.
http://www.xprogress.com/post-44-how-to-parse-json-files-on-iphone-in-objective-c-into-nsarray-and-nsdictionary/
If you want to get data or Dictionary fron JSONData then use bellow code..
NSString *responseString = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
NSArray *resultsArray = [responseString JSONValue];
for(NSDictionary *item in resultsArray)
{
NSDictionary *project = [item objectForKey:#"result"];//use your key name insted of result
NSLog(#"%#",project);
}
and also download JSON Library and tutorial from below link...
http://mobileorchard.com/tutorial-json-over-http-on-the-iphone/
I'm trying to extract the weather information from here using Xpath on the iPhone. As of now it parses all the data but I'm stuck on how to extract the content and display it in a table.
This is what I have so far:
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[ #"http://aviationweather.gov/adds/metars/?station_ids=1234&std_trans=translated&chk_metars=on&hoursStr=most+recent+only&submitmet=Submit"stringByReplacingOccurrencesOfString:#"1234" withString:self.title]]];
TFHpple * doc = [[TFHpple alloc] initWithHTMLData:data];
NSArray * elements = [doc searchWithXPathQuery:#"//table[1]//tr"];
NSLog(#"%#", elements);
TFHppleElement * element = [elements objectAtIndex:0];
[element content]; // Tag's innerHTML
[element tagName]; // "a"
[element attributes]; // NSDictionary of href, class, id, etc.
[element objectForKey:#"href"]; // Easy access to single attribute
If anybody needs to see what its outputting so far, let me know.
Thanks,
Andrew
I had the same issue I got to the point your at and didn't no where to go but I end up implementing this code. Hope it helps there is still little bits need to make it work correctly but do to the nature of the app I have developed this is all I can give you. its not much more its just the actual implementation into your code that you need really.
#import "XPathQuery.h"
NSMutableArray *weatherArray = [[NSMutableArray arrayWithArray:0]retain]; // Initilize the NSMutableArray can also be done with just an NSArray but you will have to change the populateArray method.
NSString *xPathLookupQuery = #"//table[1]//tr"; // Path in xml
nodes = PerformXMLXPathQuery(data, xPathLookupQuery); // Pass the data in that you need to search through
[self populateArray:weatherArray fromNodes:nodes]; // To populate multiple values into array.
session = [[self fetchContent:nodes] retain]; // To populate a single value and returns value.
- (void)populateArray:(NSMutableArray *)array fromNodes:(NSArray *)nodes
{
for (NSDictionary *node in nodes) {
for (id key in node) {
if ([key isEqualToString:#"nodeContent"]) {
[array addObject:[node objectForKey:key]];
}
}
}
}
You only need either the above code or below code unless you want both.
- (NSString *)fetchContent:(NSArray *)nodes
{
NSString *result = #"";
for (NSDictionary *node in nodes) {
for (id key in node) {
if([key isEqualToString:#"nodeContent"]) {
result = [node objectForKey:key];
}
}
}
return result;
}
I am attempting to cache a web request. Basically I have an app that uses a facebook user's friend list but I don't want to grab it every single time they log in. Maybe refresh once per month. Caching the friend list in a plist in the documents directory seems to make sense for this functionality. I do this as follows:
- (void)writeToDisk {
NSLog(#"writing cache to disk, where cache = %#", cache);
BOOL res = [cache writeToFile:[FriendCache persistentPath] atomically:YES];
NSLog(#"reading cache from disk immediately after writing, res = %d", res);
NSMutableArray *temp = [[NSMutableArray alloc] initWithContentsOfFile:[FriendCache persistentPath]];
NSLog(#"cache read in = %#", temp);
}
+ (NSString *)persistentPath {
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:#"FriendCache.plist"];
}
These are members of a FriendCache singleton I am using which basically wraps an NSMutableArray. I have verified that the peristentPath method is returning a valid path. As you you can see in the writeToDisk method, I verify there is data in the cache and then I print the result of the write and check if any data could be read back in. There is never data read back in, because the result of the file write is 0.
The output of the cache print is very long, but here is the abbreviated version:
2010-12-28 13:35:23.006 AppName[51607:207] writing cache to disk, where cache = (
{
birthday = "<null>";
name = "Some Name1";
pic = "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs1324.snc4/7846385648654.jpg";
"pic_big" = "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs442.snc4/784365789465746.jpg";
"pic_square" = "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs1324.snc4/7846357896547.jpg";
sex = female;
status = "<null>";
uid = 892374897165;
},
{
birthday = "<null>";
name = "Some Name2";
pic = "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs625.ash1/54636536547_s.jpg";
"pic_big" = "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs170.ash2/65465656365666_n.jpg";
"pic_square" = "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs625.ash1/654635656547_q.jpg";
sex = female;
status = "<null>";
uid = 7658436;
},
...
One thing I checked out is when using writeToFile, I must make sure the object I am writing has valid plist objects. I did check this and here is how I construct the cache object:
- (void)request:(FBRequest*)request didLoad:(id)result{
NSMutableArray *friendsInfo = [[[NSMutableArray alloc] init] autorelease];
for (NSDictionary *info in result) {
NSString *friend_id = [NSString stringWithString:[[info objectForKey:#"uid"] stringValue]];
NSString *friend_name = nil;
NSString *friend_sex = nil;
NSString *friend_relationship_status = nil;
NSString *friend_current_location = nil;
if ([info objectForKey:#"name"] != [NSNull null]) {
friend_name = [NSString stringWithString:[info objectForKey:#"name"]];
}
if ([info objectForKey:#"relationship_status"] != [NSNull null]) {
friend_relationship_status = [NSString stringWithString:[info objectForKey:#"relationship_status"]];
}
if ([info objectForKey:#"sex"] != [NSNull null]) {
friend_sex = [NSString stringWithString:[info objectForKey:#"sex"]];
}
if ([info objectForKey:#"current_location"] != [NSNull null]) {
friend_current_location = [[info objectForKey:#"current_location"] objectForKey:#"name"];
}
NSString *friend_pic_square = [info objectForKey:#"pic_square"];
NSString *friend_status = [info objectForKey:#"status"];
NSString *friend_pic = [info objectForKey:#"pic"];
NSString *friend_pic_big = [info objectForKey:#"pic_big"];
NSString *friend_birthday = [info objectForKey:#"birthday"];
NSDictionary *friend_info = [NSDictionary dictionaryWithObjectsAndKeys:
friend_id,#"uid",
friend_name, #"name",
friend_pic_square, #"pic_square",
friend_status, #"status",
friend_sex, #"sex",
friend_pic, #"pic",
friend_pic_big, #"pic_big",
friend_birthday, #"birthday",
friend_relationship_status, #"relationship_status",
friend_current_location, #"current_location",
nil];
// If the friend qualifies as a single of your gender, add to the friend cache
if ( [AppHelpers friendQualifies:friend_info] == YES) {
[[FriendCache sharedInstance] push:friend_info];
}
}
[[FriendCache sharedInstance] writeToDisk];
}
My push method just wraps the NSMutableArray push:
- (void)push:(id)o {
[cache addObject:o];
}
Can you think of any reason why the write would fail?
Thanks!
So as we already pointed out, it's because of the usage of the NSNull objects.
The best way to avoid this is to create an object Friend, with all of the needed properties. Then you can easily set nil values, something not possible with NSDictionary objects (well, you'd have to remove the key, which is not very good practice).
Then, by implementing the NSCoding protocol, you can easily archive (serialize) your custom object.
This is a much better way of handling your data, and it will become MUCH easier in the future. You'll be able to call messages on the Friend objects, something not possible with NSDictionary.
Use NSError-aware API for NSPropertyListSerialization to get the data and the NSData NSError aware write API so you get a meaningful error helping you understand what your problem might be.
I'm trying to pull two values from this Dictionary, But the values I'm getting have "()" around them. Any Ideas what is causing this?
Here is the ServerOutput:
{"Rows":[{"userid":"1","location":"beach"}]}
Dictionary after JSON:
{
Rows = (
{
location = beach;
userid = 1;
}
);
}
This is what I'm getting:
location : (
beach
)
user Id : (
1
)
Both the userid and the location key values have the "()". Here is the code. Thanks a lot.
NSString *serverOutput= [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];
if(serverOutput > 1){
SBJSON *jsonFF = [[SBJSON new] autorelease];
NSError *error3 = nil;
NSDictionary *useridDict= [jsonFF objectWithString:serverOutput error:&error3];
NSLog(#"useridDict: %#",useridDict);
idreturn = [[useridDict valueForKey:#"Rows"] valueForKey:#"userid"];
locationreturn = [[useridDict valueForKey:#"Rows"] valueForKey:#"location"];
NSLog(#" user Id : %#", idreturn);
NSLog(#" location : %#", locationreturn);
Just to clarify what is going on. When parsing JSON {} gets returned as a dictionary and [] gets retured as an array. So we have useridDict an NSDictionary containing the parsed data.
'useridDict' has one key Rows which returns an NSArray.
NSArray *useridArray = [useridDict objectForKey:#"Rows"];
Our useridArray has one element, an NSDictionary
NSDictionary *dict = [useridArray objectAtIndex:0];
This dict contains the two keys: location and userid
NSString *location = [dict objectForKey:#"location"];
NSInteger userid = [[dict objectForKey:#"userid"] intValue];
You can use like this.
idreturn = [[[useridDict valueForKey:#"Rows"] objectAtIndex:0]valueForKey:#"userid"];
locationreturn = [[[useridDict valueForKey:#"Rows"] objectAtIndex:0] valueForKey:#"location"];