Question

In a WebService JSON response is coming. In the response, there is image is coming as a byte array. I have to show the image in a UIImageView. I am trying to convert the byte array to NSData. But not getting how to do that. Any help would be appreciated.
I am confident that the byte array has image data in it.
Sample Byte array for your reference:

unsigned char array = {
            137,
            80,
            78,
            71,
            ...
            66,
            96,
            130
};

Thanks

Answer 1

You have to convert the JSON to an array of strings first; you can, for example, use the NSJSONSerialization class:

NSArray *strings = [NSJSONSerialization JSONObjectWithData:theJSONString options:kNilOptions error:NULL];

Then walk the strings array, convert each entry to an integer, and add it to an allocated byte pointer/array:

unsigned c = strings.count;
uint8_t *bytes = malloc(sizeof(*bytes) * c);

unsigned i;
for (i = 0; i < c; i++)
{
    NSString *str = [strings objectAtIndex:i];
    int byte = [str intValue];
    bytes[i] = byte;
}

Then finally make an NSData out of the bytes, then init an UIImage object using it:

NSData *imageData = [NSData dataWithBytesNoCopy:bytes length:c freeWhenDone:YES];
UIImage *image = [UIImage imageWithData:imageData];