Convert NSData to NSString to Object c

Question

I want to convert NSData to NSString. What is the best way to do this?

I use this code, but the final string returns null

NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"%@",str); 

When I see the console, it will print zero.

Answer 1

Docs for NSString Say

https://developer.apple.com/documentation/foundation/nsstring/1416374-initwithdata

Return Value The NSString object is initialized by converting the bytes in the data to Unicode characters using encoding. The returned object may be different from the original receiver. Returns zero if initialization for any reason (for example, if the data does not represent valid data for encoding).

You should try a different encoding to see if it solves your problem.

  // The following constants are provided by NSString as possible string encodings. enum { NSASCIIStringEncoding = 1, NSNEXTSTEPStringEncoding = 2, NSJapaneseEUCStringEncoding = 3, NSUTF8StringEncoding = 4, NSISOLatin1StringEncoding = 5, NSSymbolStringEncoding = 6, NSNonLossyASCIIStringEncoding = 7, NSShiftJISStringEncoding = 8, NSISOLatin2StringEncoding = 9, NSUnicodeStringEncoding = 10, NSWindowsCP1251StringEncoding = 11, NSWindowsCP1252StringEncoding = 12, NSWindowsCP1253StringEncoding = 13, NSWindowsCP1254StringEncoding = 14, NSWindowsCP1250StringEncoding = 15, NSISO2022JPStringEncoding = 21, NSMacOSRomanStringEncoding = 30, NSUTF16StringEncoding = NSUnicodeStringEncoding, NSUTF16BigEndianStringEncoding = 0x90000100, NSUTF16LittleEndianStringEncoding = 0x94000100, NSUTF32StringEncoding = 0x8c000100, NSUTF32BigEndianStringEncoding = 0x98000100, NSUTF32LittleEndianStringEncoding = 0x9c000100, NSProprietaryStringEncoding = 65536 }; 

Answer 2

Use the code below.

 NSString* myString; myString = [[NSString alloc] initWithData:nsdata encoding:NSASCIIStringEncoding]; 

Answer 3

-[NSString initWithData:encoding] will return nil if the specified encoding does not match the encoding of the data.

Make sure your data is encoded in UTF-8 (or change NSUTF8StringEncoding to any encoding that matches the data).

Answer 4

 NSString *string = [NSString stringWithUTF8String:[Data bytes]]; 

Answer 5

-[NSString initWithData:encoding] is your friend, but only with the correct encoding.

Answer 6

Goal C:

 [[NSString alloc] initWithData:nsdata encoding:NSASCIIStringEncoding]; 

Swift:

 let str = String(data: data, encoding: .ascii) 

Answer 7

in object C:

 NSData *tmpData; NSString *tmpString = [NSString stringWithFormat:@"%@", tmpData]; NSLog(tmpString) 

Answer 8

Not sure about the type of data encoding? No problems!

Without the need to know potential encoding types in which the wrong encoding types will give you zero / zero, this should cover all of your bases:

 NSString *dataString = [data base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithCarriageReturn]; 

Done!

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Note. If NSKeyedUnarchiver , you can unpack NSData using NSKeyedUnarchiver and then re-pack (id)unpacked NSKeyedArchiver through NSKeyedArchiver , and this NSData form must be encoded in base64.

 id unpacked = [NSKeyedUnarchiver unarchiveObjectWithData:data]; data = [NSKeyedArchiver archivedDataWithRootObject:unpacked]; 

Answer 9

Swift:

 let jsonString = String(data: jsonData, encoding: .ascii) 

or .utf8 or any suitable encoding