CODEWITHSUNDEEP
iosobjective-cjsonnsjsonserialization
PSsam
PSsam

Reputation: 649

deserialization of an image from json using NSJSONSerialization

I'm trying to deserialize JSON coming from the server using NSJsonSerialization. The server returns a png image converted to a string. Here is my code:

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
        NSError *deserializationError;
        id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves error:&deserializationError];
        if (deserializationError) {
            NSLog(@"JSON deserialization error: %@", deserializationError.localizedDescription);
            return;
        }
} ];

Here is what I receive from the server:

{"photo":"�PNG\r\n\u001A\n\u0000\u0000\u0000\rIHDR\u0000\u0000\u0000:\u0000\u0000\u0000:\b\u0002\u0000\u0000\u0000n��\u007F\u0000\u0000\u001FrIDATx�}z\u0005W[y��|��..."}

But i've got an error parsing JSON: "JSON deserialization error: The operation couldn’t be completed. (Cocoa error 3840.)". I think that the problem is with the format of JSON. But guys, that write server side say that they can successfully deserialize this object. Any suggestions how to deal with this JSON?

Upvotes: 2

Views: 1210

Answers (2)

Kalpit Gajera
Kalpit Gajera

Reputation: 2525

ImageData can't directly transfer to NSString, you can do this by GMTBase64:

Encode

NSString *imgStr = [GTMBase64 stringByEncodingData:imageData];

Decode

NSData *imageData = [GTMBase64 decodeString:imageStr];

Convert to Image

UIImage *image = [[UIImage alloc]initWithData:imageData];

Upvotes: 0

Amar
Amar

Reputation: 13222

As far as I know a JSON response must be string. The image you are getting looks like image data which is breaking the JSON parse with NSPropertyListErrorMinimum (Cocoa error domain: 3840). The server side JSON needs to send image encoded as a base64 string. This will keep the JSON valid at client side..

You can decode the base64 encoded image to get the image data at client side. Use this NSData category which will help you decode the base64 string to NSData. 

NSData *imageData = [NSData dataWithBase64EncodedString:base64JSONString];
// Create image with data
UIImage *image = [[UIImage alloc] initWithData:imageData];

Hope that helps!

Upvotes: 1

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