XML parsing is not working as expected in Objective-C - iphone

Question

I am new to iPhone programming, and this is the first time parsing XML file. I have added the url and also hardcoded the XML file into the string, however I am not getting the correct response from the server.
Here is my code:
NSString *post = #"<?xml version=\"1.0\"encoding=\"UTF-8\"?<request><call>GetNewChapters</call><udid>1000000000000000000000000000000000000000</udid><book_id>1</book_id><updatetoken>B20100125054802</updatetoken></request>";
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
NSURL *url=[NSURL URLWithString:#"https://www.paisible.com/babelle_api"];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSString *myStr = [[NSString alloc] initWithData:postData encoding:NSUTF8StringEncoding];
NSLog(#"String Value :%#",myStr);
NSLog(#"theRequest: %#", request);
NSURL *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if(theConnection)
{
webData = [[NSMutableData data] retain];
}
else
{
NSLog(#"theConnection is NULL");
}
Where as webdata is NSMutable data. Please let me know what errors I have made in my parsing code.

Answer 1

Try to replace
NSURL *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
with the following:
NSURLResponse *resp;
NSError *error;
NSMutableData *webData = [NSURLConnection sendSynchronousRequest:request returningResponse:&resp error:&error];
Than, check what "webData" contains.