iPhone + Drupal + JSON RPC Server problem - iphone

Question

I don't have any idea how to post a JSON RPC request using Obj-C. Can anyone help me?
So far I have:
responseData = [[NSMutableData data] retain];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://*************/services/json-rpc"]];
NSString *jsonString = #"{\"jsonrpc\": \"2.0\",\"method\": \"node.get\", \"params\": { \"arg1\": 1 } ,\"id\": \"dsadasdas\"}";
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF32BigEndianStringEncoding];
[ request setHTTPMethod: #"POST" ];
[ request setHTTPBody: jsonData ];
[ request setValue:#"application/json" forHTTPHeaderField:#"Content-> Type"];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
I'm using drupal + services + Json Server & JSON rpc server.
Seems I'm getting better results with the first one, the problem is building the body of the post i Think...
Please help me.

Answer 1

This fixed it:
SBJSON *json = [SBJSON new];
json.humanReadable = YES;
NSString *service = #"node.get";
NSMutableDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
#"1",#"nid",
nil];
//Pass it twice to escape quotes
NSString *jsonString = [NSString stringWithFormat:#"%#", [params JSONFragment], nil];
NSString *changeJSON = [NSString stringWithFormat:#"%#", [jsonString JSONFragment], nil];
NSLog(jsonString);
NSLog(changeJSON);
NSString *requestString = [NSString stringWithFormat:#"method=node.get&vid=1",service,changeJSON,nil];
NSLog(requestString);
NSData *requestData = [NSData dataWithBytes: [requestString UTF8String] length: [requestString length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: #"http://******************/services/json"]];
NSString *postLength = [NSString stringWithFormat:#"%d", [requestData length]];
[request setHTTPMethod: #"POST"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody: requestData];
//Data returned by WebService
NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil ];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
NSLog(returnString);