iPhone - Http Post : send a value to a web xml - iphone

Question

i know there are a lot of questions about this but none seems to work for what I want to do. I want to change the value of a tag so let's say i have this file :
</Courbe>
<tempset>140</tempset>
</Courbe>
I want my http post request to change this value. How do I do this?
I have already tried something like that :
- (IBAction)changeTemp:(id)sender
{
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"http://207.134.145.16:50001/Courbe.xml"]];
[request setHTTPMethod:#"POST"];
[request setValue:#"text/xml" forHTTPHeaderField:#"Content-type"];
NSString *xmlString = #"<tempset>137</tempset>";
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
Is it something like this? Thanks for your help!

Answer 1

Url encode the xmlString, then:
NSData *postData = [xmlString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
[request setHTTPBody:postData];
[request setValue:[NSString stringWithFormat:#"%d", [postData length]] forHTTPHeaderField:#"Content-Length"];
[request setValue:#"text/xml" forHTTPHeaderField:#"Content-Type"];
To send, use something like this:
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {}];
Prior to iOS5, you can send asynchronously this way:
// make the request and an NSURLConnection with a delegate
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
[[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];
// create a property to hold the response data, then implement the delegate methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
responseData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[responseData release];
[textView setString:#"Unable to fetch data"];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *responseString = [[[NSString alloc] initWithData:responseData encoding: NSASCIIStringEncoding] autorelease];
}