Proper way to get the byte array from the JSON

Question

I am trying to get the image from the byte array. I can only get the image if enter the byte array values into the string directly as follows:

    NSMutableString *imagen = [[NSMutableString alloc] initWithString:@"-1,-40,-1,-32,0,16,74,70,73,70,0,1,0,1,0,96,0,96,0,0,-1,-2,0,31,76,69,65,68,32,84,101,99,104,110,111,108,111,103,105,101,115,32,73,110,99,46,32,86,49,46,48,49,0,-1,-37,0,-124,0,5,5,5,8,5,8,12,7,7,12,12,9,9,9,12,13,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13];

//this way works fine

IF i try to get the byte array into string as follows,then I couldnt get the image:

    NSString *logo=[NSString stringWithFormat:@"%@",[[JSON valueForKey:@"request"]valueForKey:@"logo" ]];

    NSMutableString *imagen = [[NSMutableString alloc] initWithString:logo];

   //this way doesnt work out

I am following this link to get the thing done.this link

Could you please tell me whats the proper way to get byte array from JSON?

How is the image data encoded in the JSON since JSON does not support data? Base64 or something else? — zaph, Feb 09 '15 at 22:31
I ddidnt encoded the image. It is done by another developer. I am updating my question. PLease look into it. — Teja Nandamuri, Feb 09 '15 at 22:33

zaph · Accepted Answer · 2015-02-09T22:37:24.390

This is not executable code, it is a method to use:

You get the JSON in self.receivedData

Convert it into an object with
NSDictionary *jsonObject = NSJSONSerialization JSONObjectWithData:

** Unknown how the image data is encoded in the JSON. If it is Base64 encoded:

Get the Base64image string with
NSString *imageString = jsonObject[@"request"][@"logo"]

Convert the Base64 string into data:
NSData *imageData = [NSData alloc] initWithBase64EncodedString: imageString options:

Get an image with
UIImage *logoImage = [imageData imageWithData]

All in all you have way to much code that accomplished nothing and converting the image data to an NSString is incorrect.

Converting to a string and then back to data accomplishes nothing.

score 0 · Answer 2 · answered Feb 09 '15 at 22:42

This code seems confused? The link you posted has string encodings which contain negative numbers. You parse these as signed but then assign them to an array of unsigned uint8_t using bytes[i] = (uint8_t)byte;.

I think you need to post the string encoding format and an example?

Proper way to get the byte array from the JSON

2 Answers2