How to pass a json object as a parameter to the webservice?

Question

I am using a webservice which takes json object as parameter. Here's my code:

    -(void)createHttpHeaderRequest {

        NSString *x = @"{\"GetVehicleInventory\": {\"ApplicationArea\": {\"Sender\": {\"ComponentID\":}}}" (something like that)

        NSString *sample = [NSString stringWithFormat:@"https://trialservice.checkitout?XML_INPUT=%@",x];
 NSString * final = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)sampleReq, NULL, CFSTR(":/?#[]@!$&'()*+,;=\""), kCFStringEncodingUTF8);
 NSMutableRequest *request = [NSMutableREquest requestWithURL:[NSURL URLWithString:final]];
    NSURLConnection * theConnection = [[NSURLConnection alloc]initWithRequest:theRequest delegate:self];
        if (theConnection) {
            NSLog(@"Service hit");
        }
    }

    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        NSError * error;
        NSDictionary * dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
        NSArray * categories = [dict objectForKey:@"category"];
        [self.delegate giveControlBackToController:categories];

    }

When I am trying to NSLog sample it gives me the complete URL which on pasting into a browser gives me the result back, but when I am calling NSLog on the request, it shows null and nothing happens after this. The control never goes to its NSURLConnection delegate method.

Please make the effort to use correct English and paste some code that at least compiles. — , Jul 25 '12 at 18:52
You're creating an NSMutableRequest called `request` but then initializing your NSURLConnection with something called `theRequest`. Does that reflect your actual code or is that just an error introduced when you copied it here? — Ethan Holshouser, Jul 25 '12 at 19:54
That's just an error which got introduced here. Sorry about that. — Ashutosh, Jul 25 '12 at 19:57
Have you implemented `connection: didReceiveResponse:` in your delegate? — Ethan Holshouser, Jul 25 '12 at 20:06

score 1 · Answer 1 · answered Jul 25 '12 at 18:54

1

The trick is that most browsers automatically escape URLs whilst NSURL doesn't. You'll need to do it manually; have a look at the CFURLCreateStringByAddingPercentEscapes function.

answered Jul 25 '12 at 18:54

OK. So i tried this and it's not giving me null now but still doesn't hit the delegate method plus the the url is now filled with a lot of %7D etc. Any other suggestions?? – Ashutosh Jul 25 '12 at 19:05
Have you set the delegate? Have you even created an NSURLConnection? – Jul 25 '12 at 19:08
Yes. NSURLConnection * theConnection = [[NSURLConnection alloc]initWithRequest:theRequest delegate:self]; – Ashutosh Jul 25 '12 at 19:09
please see the edit above. Can't show the correct url or the json parameter but this is it. – Ashutosh Jul 25 '12 at 19:22
@Ashutosh so have you finally added the percent escapes using the function I suggested? I don't see it anywhere. Also, in `connection:didReceiveData:` doesn't do what you think it does -- the data parameter is partial data and should be collected using an NSMutableData instance. – Jul 25 '12 at 19:36
Sorry about that. It was in my code somehow it got skipped while pasting code here. And the connectionDidReceiveData is not even being called. I just want to hit the service and see the response. I have put a break point in the start of this delegate method just to see if the program reaches here. – Ashutosh Jul 25 '12 at 19:41
Escape the JSON only, not the whole URL string. – Jul 25 '12 at 20:00

score 0 · Answer 2 · answered Jul 25 '12 at 20:13

0

This should probably be a comment instead of an answer, but unfortunately you can't format code in a comment. Add the following method to your delegate and see whether it gets called. If it does, let us know what the response is.

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
    NSLog(@"Connection response code: %d", httpResponse.statusCode);
}

answered Jul 25 '12 at 20:13

Ethan Holshouser

1,402
14
13

Its not getting called. But method didFailWithError does and it says NSLocalizedDescription=The certificate for this server is invalid. You might be connecting to a server that is pretending to be “209.112.58.126” which could put your confidential information at risk., NSUnderlyingError=0x6877b40 "The certificate for this server is invalid. You might be connecting to a server that is pretending to be “209.112.58.126” which could put your confidential information at risk.", NSURLErrorFailingURLPeerTrustErrorKey=} – Ashutosh Jul 26 '12 at 15:09
It sounds like there's something wrong with the server configuration, then. You say it works in a browser, though? – Ethan Holshouser Jul 26 '12 at 17:11

How to pass a json object as a parameter to the webservice?

2 Answers2