I have a WebService, which give me the fallowing Json-String back:
"{\"password\" : \"1234\", \"user\" : \"andreas\"}"
I call the webservice and try to parse the returned data like:
[NSURLConnection sendAsynchronousRequest: request
queue: queue
completionHandler: ^(NSURLResponse *response, NSData *data, NSError *error) {
if (error || !data) {
// Handle the error
} else {
// Handle the success
NSError *errorJson = nil;
NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &errorJson];
NSString *usr = [responseDict objectForKey:#"user"];
}
}
];
But the resulting NSDictionary looks like:
What has the effect, that I cannot get the values - for example user.
Can someone help me, what I am doing wrong? - Thank you.
From the debugger screenshot is seems that the server is (for whatever reason) returning
"nested JSON": responseDict[#"d"] is a string containing JSON data again, so you have to
apply NSJSONSerialization twice:
NSError *errorJson = nil;
NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData: data options:0 error: &errorJson];
NSData *innerJson = [responseDict[#"d"] dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *innerObject = [NSJSONSerialization JSONObjectWithData:innerJson options:NSJSONReadingMutableContainers error:&errorJson];
NSString *usr = [innerObject objectForKey:#"user"];
If you have the option, a better solution would be to fix the web service to return
proper JSON data.
Related
I want to try to convert NSData to NSDictionary or NSArray but some how i can't do that but whenever try to convert into NSString it will converted and gating data so any one can know what is mistake ,help me below is code for convert
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data
options:0
error:nil];
Below code for convert into NSString
NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
But Problem is that When get this type of data it will converted on array
Response:
[["superwoman",0],["sugar",0],["sultan trailer",0],["summer",0],["superman",0],["sunday candy",0],["sublime",0],["summer sixteen",0],["superfruit",0],["sultan songs",0]]
but Whenever gat this type of response it will not converted on array formated because of ,[3 on response
Response:
[["ssundee",0],["selena gomez",0],["sia",0],["sorry beyonce",0],["smosh",0],["sweatshirt jacob
sartorius",0],["skydoesminecraft",0],["secret life of pets
trailer",0,[3]]
try this one
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseObject
options:kNilOptions
error:&error];
1)You need to take the response in id type variable & check the class of response like below.
2)You also need to check if JSON convertion is successful
NSError * error;
id result = [NSJSONSerialization JSONObjectWithData:data
options:0 error:&error];
if (!error) {
if([id isKindOfClass:[NSDictionary class]]){
//Response is Dictonary
} else if ([id isKindOfClass:[NSArray class]]){
//Response is Array
} else {
//any other format
}
} else {
//Handle error
}
NSString *connection = #"http:"(link);
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSError *error = nil;
NSURL *url = [NSURL URLWithString:connection];
NSString *json = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
NSLog(#"\nJSON: %# \n Error: %#", json, error);
if(!error) {
NSData *jsonData = [json dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%#",jsonData);
NSMutableArray *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&error];
NSLog(#"JSON: %#", jsonDict);
}
});
The above code returns :
JSON: "{\"value\":[{\"Id\":\" }}
but
NSData is 69746963 735c222c 5c224973 41767469 76655c22 3a5c2231 5c222c
and jsonDict returns (null).
I am confused what may be going on.
Can somebody please help me figure it out.
I am trying to get the JSON data but it returns null.
Thanks
You say the server gave you this:
JSON: "{\"value\":[{\"Id\":\" }}
If I remove the backslashes that were added by the NSLog command, the actual JSON that you received was
{"value":[{"Id":" }}
That isn't valid JSON. That's all there is to it; the server sent you rubbish data, and there is no way to get any information from it. Contact the people creating the server software and ask them to fix the problem.
And you really, really need to distinguish between what an object really contains, and what NSLog prints. NSLog prints the contents of an NSData object by displaying each byte as two hexadecimal digits.
Try one of these (array or dictionary) without converting it into JSON, depending on what u want :
NSString *connection = #"http://(link)";
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSDictionary *jsonDict = [NSDictionary dictionaryWithContentsOfURL:[NSURL URLWithString:connection]];
NSArray *jsonArray = [NSArray arrayWithContentsOfURL:[NSURL URLWithString:connection]];
NSLog(#"DICT: %# ARRAY: %#", jsonDict, jsonArray);
});
I haven't tried it, please paste results?
By the look of your NSString response, it starts with { and ends with } which means it is a NSDictionary.
Change :
NSMutableArray *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&error];
to :
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData options:nil error:&error];
Here is what I want to parse.
{
"Words": {
"subjugate": "To conquer. ",
"contemplate": "To consider thoughtfully. ",
"comprise": "To consist of. ",
"pollute": "To contaminate. "
}
}
Here is a very stripped and over-simplified way to handle getting response data back from a server in JSON and serializing the JSON to an NSDictionary:
// this is just for example purposes, in this example the code is already running on a background thread so sending it synhcronously is OK, and I've already created the request object
NSError *error = nil;
NSHTTPURLResponse *response = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
// if we don't have response data
if (!responseData) {
// handle that we got no response from the server
}
if (error) {
// handle the request error
}
// serialize the JSON result into a dictionary
NSError *serializationError = nil;
NSDictionary *resultDictionary = [NSJSONSerialization JSONObjectWithData:responseData options:0 &serializationError];
if (serializationError) {
// handle the error turning the data into dictionary
}
NSDictionary *wordsDictionary = resultDictionary[#"words"];
NSString *exampleValue = wordsDictionary[#"subjugate"]; // will be "To conquer." if everything goes to plan
You can parse as bellow
NSData *data = [#"{\"Words\":{\"subjugate\":\"To conquer.\",\"contemplate\":\"To consider thoughtfully.\",\"comprise\":\"To consist of.\",\"pollute\":\"To contaminate.\"}}" dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
if(error)
{
NSLog(#"Error : %#", error);
}
else
{
NSLog(#"%#", json);
}
I'm really scratching my head at this one. I'm using the Pocket API to allow users to archive Pocket articles from my app, but whenever I try to do so with the below code I get this error:
Error Domain=PocketSDK Code=400 "Invalid request, please refer to API documentation" UserInfo=0xc17d3b0 {NSLocalizedDescription=Invalid request, please refer to API documentation}
Code:
NSDictionary *arguments = #{#"action": #"archive",
#"item_id": articleID};
[[PocketAPI sharedAPI] callAPIMethod:#"send" withHTTPMethod:PocketAPIHTTPMethodPOST arguments:arguments handler:^(PocketAPI *api, NSString *apiMethod, NSDictionary *response, NSError *error) {
if (!error) {
NSLog(#"Archived article.");
}
}];
Exactly what part of that is incorrect? Am I not POSTing a send method to the API?
EDIT: I even changed it to have #"action" be #"actions" and to supply it the above NSDictionary, and it returns without an error but doesn't affect it on the Pocket website...
EDIT 2: Per the response of Joseph Chen I changed my code to the following:
// Create data to pass to the Pocket API (a JSON array of actions)
NSError *error;
NSArray *actions = #[#{#"action": #"archive",
#"item_id": articleID}];
NSData *actionsAsJSONData = [NSJSONSerialization dataWithJSONObject:actions options:kNilOptions error:&error];
NSString *actionsAsJSONString = [[NSString alloc] initWithData:actionsAsJSONData encoding:NSUTF8StringEncoding];
NSDictionary *arguments = #{#"actions": actionsAsJSONString};
[[PocketAPI sharedAPI] callAPIMethod:#"send" withHTTPMethod:PocketAPIHTTPMethodPOST arguments:arguments handler:^(PocketAPI *api, NSString *apiMethod, NSDictionary *response, NSError *error) {
if (!error) {
NSLog(#"%#", response);
}
else {
NSLog(#"%#", error);
}
}];
Which returns:
action_results" = (
1
);
status = 1;
Yet when I go to the website and log in, the article I "archived" is still staring me in the face, unarchived.
According to the documentation the actions parameter should be a JSON dictionary. So you could either...
Create the JSON dictionary manually:
NSString *jsonString = [NSString stringWithFormat:#"[{\"action\":\"archive\",\"item_id\":\"%#\"}]", articleID]; // articleID is a NSString?
NSDictionary *arguments = #{#"actions": jsonString};
Use NSJSONSerialization:
NSDictionary *actions = #{#"action": #"archive", #"item_id": articleID};
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:actions
options:kNilOptions
error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData
encoding:NSUTF8StringEncoding];
NSDictionary *arguments = #{#"actions": jsonString};
This answer is also a reference.
Here's the code taken (almost) straight from my app:
NSTimeInterval timestamp = [[NSDate date] timeIntervalSince1970];
NSDictionary *arguments = #{#"actions" : #[#{#"action" : #"archive",
#"item_id" : itemId,
#"time" : [NSString stringWithFormat:#"%ld", (long)timestamp]}]};
[self.pocketAPI callAPIMethod:#"send"
withHTTPMethod:PocketAPIHTTPMethodPOST
arguments:arguments
handler:^(PocketAPI *api, NSString *apiMethod, NSDictionary *response, NSError *error)
{
if (!error) {
// OK
} else {
// handle error
}
}];
This is my code for handling server response.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"connectionDidFinishLoading : %#", [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding]);
}
This is the message Server response to me, NSLog JSON displays in console.
connectionDidFinishLoading : {"ErrorCode":"CssParameterException","ErrorMessage":"An error has occurred, please try again later.","Success":false}
My question is: how do I deserialize the JSON and store it into a local variable NSDictionary *jsonData?
Any suggestions? Please give me some code example, thanks!
NSError *e = nil
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData: responseData options: NSJSONReadingMutableContainers error: &e];
If you have NSString response
NSError *e = nil
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData: [responseString dataUsingEncoding:NSUTF8StringEncoding] options: NSJSONReadingMutableContainers error: &e];