Parse multipart response for image download in ios

Question

In my application, I\'m downloading image from server as multipart content. In my response data I\'m getting 2 parts: one is json content and other is downloaded file. The r

Answer 1

For me, your code didn't work. Instead, I rewrote that code in pure objective-c: Take care that (my) boundaries in this code always have additional -- in front of the next boundary and a final boundary - those are stripped. An NSArray is returned with a NSDictionary for each part, containing the keys "headers" as NSDictionary and "body" as NSData

- (NSArray *)multipartArrayWithBoundary:(NSString *)boundary
{
    NSString *data = [[[NSString alloc] initWithData:self encoding:NSUTF8StringEncoding] autorelease];

    NSArray *multiparts = [data componentsSeparatedByString:[@"--" stringByAppendingString:boundary]]; // remove boundaries
    multiparts = [multiparts subarrayWithRange:NSMakeRange(1, [multiparts count]-2)]; // continued removing of boundaries

    NSMutableArray *toReturn = [NSMutableArray arrayWithCapacity:2];
    for(NSString *part in multiparts)
    {
        part = [part stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        NSArray *separated = [part componentsSeparatedByString:@"\n\n"];

        NSMutableDictionary *headers = [NSMutableDictionary dictionaryWithCapacity:3];
        for(NSString *headerLine in [[separated objectAtIndex:0] componentsSeparatedByString:@"\n"])
        {
            NSArray *keyVal = [headerLine componentsSeparatedByString:@":"];

            [headers setObject:[[keyVal objectAtIndex:1] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] forKey:[[keyVal objectAtIndex:0] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
        }

        [toReturn addObject:[NSDictionary dictionaryWithObjectsAndKeys:[[separated objectAtIndex:1] dataUsingEncoding:NSUTF8StringEncoding], @"body", headers, @"headers", nil]];
    }

    return toReturn;
}