This is my first native iOS app, so please bear with..
How would I construct this json data in a NSDictionary (I would guess thats how I would do it) so I cand make it part of my request body.
{
"Properties":{
"Description":"String content",
"Domain":"String content",
"GroupID":"String content",
...
},
"Foo":{....},
}
Yes, use a dictionary, created using literals or code.
NSDictionary* jsonDict = #{#"Properties":#{#"Description":#"String content",#"Domain":#"String content",#"GroupID":#"String content",},#"Foo":{....},}
Convert the dictionary into JSON data ready for posting.
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDict options:0 error:&error];
Related
I have a json file that looks like this:
{
"data":
{
"level": [
{
//bunch of stuff
}
]
}
}
Now I want to convert that into a array of levels that I can access. If I take away the {"data: part, then I can use this:
NSData *allLevelsData = [[NSData alloc] initWithContentsOfFile:fileLoc];
NSError *error = nil;
NSMutableDictionary *allLevels = [NSJSONSerialization JSONObjectWithData:allLevelsData options:kNilOptions error:&error];
if(!error){
NSMutableArray *level = allLevels[#"level"];
for (NSMutableDictionary *aLevel in level){
//do stuff with the level...
But I have to have the {"data: as part of the file, and I can't figure out how to get a NSData object out of the existing NSData object. Any ideas?
Don't you need to pull the level NSArray out of the data NSDictionary first?
NSData *allLevelsData = [[NSData alloc] initWithContentsOfFile:fileLoc];
NSError *error = nil;
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:allLevelsData options:kNilOptions error:&error];
if(!error){
NSArray *levels = dataDictionary[#"data"][#"level"];
for (NSDictionary *aLevel in levels){
//do stuff with the level...
You won't get mutable objects back by default and declaring the variables as mutable doesn't make them so. Take a mutableCopy of the result instead (assuming you really do need mutability).
Why are you trying to prune ahead of time? If you decode the original JSON, you'll be able to extract the level array from the data dict in the decoded dict.
It's not clear what else you're trying to accomplish or why you are going the path you ask about. Note, this doesn't necessarily mean your path is wrong, just that without a clearer indication of what goal you're really trying to accomplish or what you've actually tried (and errored/failed, along with how it failed), you're likely only to get vague/general answers like this.
I am fairly new to xcode but I currently have an app that will send data to a sql database but I know it has to go through JSON first.
Say my app is simply a text box where a user enters a name and submits. How would I turn that data into JSON? What would the syntax look like?
https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSJSONSerialization_Class/
If you are sending the data through a network, then look into AFNetworking.
(added in response to a comment)
NSString *jsonFromObject(id object)
{
NSError* error = nil;
NSData* jsonData = [NSJSONSerialization dataWithJSONObject: object options: 0 error: &error];
if (error) {
NSLog(#"error creating json string: %#", error);
}
return [[NSString alloc] initWithData: jsonData encoding: NSASCIIStringEncoding];
}
I m using AFNetworking 2.0 in my iOS application. it's working fine at every stage. I stuck in one problem that how to post smiley with text to update status using Afnetworking. Please help me out if anyone had done this.
"\ud83d\ude04" is the JSON Unicode escape sequence for U+D83D U+DE04, which is the "surrogate pair" for the Unicode U+1F604 (SMILING FACE WITH OPEN MOUTH AND SMILING EYES).
But NSJSONSerialization decodes this correctly, as can be seen in the following example:
const char *jsonString = "{ \"emoji\": \"\\ud83d\\ude04\" }";
NSLog(#"JSON: %s", jsonString);
NSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];
NSError *error;
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
self.myLabel.text = [jsonDict objectForKey:#"emoji"];
NSLog(#"Emoji: %#", self.myLabel.text);
Output:
JSON: { "emoji": "\ud83d\ude04" }
Emoji: 😄
I am trying to convert a string into a json object and am unsure why this is not working. When I nslog the output I am told that urldata is not valid for json serialization however when looking at the string it looks to me like valid json. I have also tried encoding it to an utf8 however it still won't serialize. Am I missing something here? - Note unnecessary code omitted from post.
Get request
urlData = [NSURLConnection sendSynchronousRequest:urlRequest
returningResponse:&response
error:&error];
NSDictionary *tempDict = [NSDictionary alloc];
Parsing
if ([NSJSONSerialization isValidJSONObject:urlData] ) {
NSLog(#"is valid");
tempDict = [NSJSONSerialization JSONObjectWithData:urlData kniloptions error:&error];
}
NSLog(#"is not valid");
Definition:
isValidJSONObject:
Returns a Boolean value that indicates whether a given object can be converted to JSON data.
As you are already mentioning in your question, isValidJSONObject
returns a Boolean value that indicates whether a given object can be
converted to JSON data
In your case, you don't want to create JSON data, but instead create a dictionary out of JSON data. :
tempDict = [NSJSONSerialization JSONObjectWithData:urlData
options:NSJSONReadingMutableContainers
error:&error];
if (!tempDict) {
NSLog(#"Error parsing JSON: %#", error);
}
I am working on an application and i need to send some data to my server. The data is in json format and more specific the json file looks like this :
{
"eventData": {
"eventDate": "Jun 13, 2012 12:00:00 AM",
"eventLocation": {
"latitude": 43.93838383,
"longitude": -3.46
},
"text": "hjhj",
"imageData": "raw data",
"imageFormat": "JPEG",
"expirationTime": 1339538400000
},
"type": "ELDIARIOMONTANES",
"title": "accIDENTE"
}
So i have tried to hardcode the data in my json file and everything works ok. Now what i am trying to do is to fill my json file , using variables so everything can work automatcally when data changes. What would a good approach be for that?? Some sample code would be highly appreciated as i am very new to obj-c. Thanks for ur time! :D
EDIT
Ok so an NSDictionary seems a nice way to go.
But how can i create a dictionary to look like the json format?? I ve only used dictionaries like this :
NSArray *keys = [NSArray arrayWithObjects:#"eventDate", #"eventLocation", #"latitude" nil];
NSArray *objects = [NSArray arrayWithObjects:#"object1", #"object2", #"object3", nil];
dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
For the langitude and longitude for example it is a pair of key and value but for the rest??
All you need is a NSDictionary containing your keys and values. Since iOS5, you can proceed with the following code
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:myDictionary
options:NSJSONWritingPrettyPrinted
error:&error];
if (!jsonData) {
NSLog(#"Got an error: %#", error);
} else {
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
// ...
}
I have used this library . It is very simple and useful. And for tutorial check this site.