is there some way to convert an NSData object, into an NSMutableData one? Basically I am using NSJSONSerialization which basically takes some JSON data I receive and transforms it into an NSData object instance. Is there anyway to then transform this into an NSMutableData object instance? I need to do this because later on, I will be spawning some threads and within the code blocks I provide, I would like to change the value of the Data object. I can't do that if its NSData but I can if its NSMutableData.
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5NSMutableData *mutableData = [receivedData mutableCopy]; – h.kishan Jan 15 '14 at 05:34
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1I have no idea how you intend to hang the NSData. Normally you would serialize the received data to dictionaries or arrays and work with them. – vikingosegundo Jan 15 '14 at 05:48
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@vikingosegundo this is a good point. Here's a line of code i use in my project. NSMutableDictionary * leaderBoardJsonData = (NSMutableDictionary)[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil]; – Karim Jan 15 '14 at 05:56
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NSMutableData * data = [NSMutableData dataWithData:jsonData];
This should solve your problem.
vikingosegundo
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Karim
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If I call the dataWithData command on the same NSMutableData object instance multiple times, will it then re-write the data each time since its mutable? – AyBayBay Jan 15 '14 at 05:41
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2you don't call `dataWithData:` on an object. you call it on the class. – vikingosegundo Jan 15 '14 at 05:43
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@vikingosegundo said it, call it on the actually NSMutableData class, not the instance of the class (data) – Karim Jan 15 '14 at 05:50
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You can use below code:
NSData *data = ...;
NSMutableData *mutableData = [[NSMutableData alloc] initWithData:data];
vikingosegundo
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Ashutosh
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