How to extarct string between two square bracket Objective C - iphone

Question

I have string like this:
jsonArray:
{
d = "[{\"Training_Code\":\"1234 \",\"Training_Duration\":\"2hrs \",\"Training_Startdate\":\"14/02/2013 15:00:00\",\"Training_Enddate\":\"14/02/2013 17:00:00\",\"Trainer_ID\":1,\"Training_Location\":\"B-Wing Training room-4\",\"Comments\":\"C# training\",\"Keyword\":\"C#1234\",\"NumberofDays\":1},{\"Training_Code\":\"4321 \",\"Training_Duration\":\"16 \",\"Training_Startdate\":\"17/02/2013 10:30:00\",\"Training_Enddate\":\"17/02/2013 17:30:00\",\"Trainer_ID\":2,\"Training_Location\":\"A-Wing Training Room-6\",\"Comments\":\"Objective-C\",\"Keyword\":\"Obj-C4321\",\"NumberofDays\":2}]";
}
I want to get the data between two square bracket(including square bracket) and then remove all the "\" to get my final string like this:
[
{
"Training_Code": "1234",
"Training_Duration": "2hrs",
"Training_Startdate": "14/02/201315: 00: 00",
"Training_Enddate": "14/02/201317: 00: 00",
"Trainer_ID": 1,
"Training_Location": "B-WingTrainingroom-4",
"Comments": "C#training",
"Keyword": "C#1234",
"NumberofDays": 1
},
{
"Training_Code": "4321",
"Training_Duration": "16",
"Training_Startdate": "17/02/201310: 30: 00",
"Training_Enddate": "17/02/201317: 30: 00",
"Trainer_ID": 2,
"Training_Location": "A-WingTrainingRoom-6",
"Comments": "Objective-C",
"Keyword": "Obj-C4321",
"NumberofDays": 2
}
]
How can I do this in objective-c? thanks.

Answer 1

Try using JSONKit(ref) or NSJSONSerialization (ref), they will give either an NSArray or NSDictionary, depending on the structure of the JSON string.
UPDATE:
d looks like a well formed JSON string, but where is it coming from? Is it a char[] (as mentioned in the coments above), NSString, or console output?
It looks from here that your first code listing is what gets printed to the console. Printing JSON strings to the console will usually print the escape characters (\). In your other post, you are assuming every response can be parsed into an array. It would be safer to store the returned object into an id first, then check its class:
id rawData = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError
if ( jsonParsingError != nil ) {
// investigate the parsing error
}
else if ( [rawData isKindOfClass[NSDictionary class]] ) {
NSDictionary *dict = rawData;
// process dictionary
}
else if ( [rawData isKindOfClass[NSArray class]] ) {
NSArray *array = rawData;
// process array
}
else {
// some thing went completely wrong
}
You also do not indicate that you are checking any possible errors. Inspecting jsonParsingError will likely give clues as to what is going on.

Answer 2

Use nsstring method dataUsingEncoding to get a nsdata instance.
Use NSJSONSerialization
The string you wanted is same as you provided.

Answer 3

Since d is a string:
To remove "\" , you could this:
NSString *newString = [myString stringByReplacingOccurrencesOfString:#"\" withString:#""];
Since the square brackets are at the front and the end, maybe you could do this:
[newString removeObjectAtIndex:0];
[newString removeObjectAtIndex:[newString count]-1];
first step is to get that string according to your situation and replace myString with your string.

Answer 4

Only if the source string contains one [ and ] each, then...
Use componentsSeparatedByString to split the source string with [.
Use componentsSeparatedByString to split the result (objectAtIndex:0) above with ].