Simple WebService Connection with xCode

First of all create a response data as NSMutableData and class ".h" file

@property (nonatomic) NSMutableData *responseData;

Now Just do as follow in class ".m" file

-(void)validateUser:(NSString *)userId andPassword:(NSString *)userPassword

{

    NSString *envelopeText = [NSString stringWithFormat:

                              @"<?xml version=\"1.0\" encoding=\"utf-8\"?>"

                              

                              "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"  xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"                    xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"

                              "<soap:Body>"

                              "<ValidateUser xmlns=\"http://tempuri.org/\">"

                              "<emailId>%@</emailId>"

                              "<password>%@</password>"

                              "</ValidateUser>"

                              "</soap:Body>"

                              "</soap:Envelope>", userId, userPassword];

    

    envelopeText = [NSString stringWithFormat:envelopeText, userId, userPassword];

    NSData *envelope = [envelopeText dataUsingEncoding:NSUTF8StringEncoding];

    

    // construct request

    

    NSString *url = @"http://mysiteurl.com/allWebSevice.asmx";

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];

    

    

    [request setHTTPMethod:@"POST"];

    [request setHTTPBody:envelope];

    [request setValue:@"text/xml;charset=utf-8" forHTTPHeaderField:@"Content-Type"];

    // Remember to put text/xml;charset=utf-8 in code, otherwise no result will be fetched

    

    [request setValue:[NSString stringWithFormat:@"%d", [envelope length]] forHTTPHeaderField:@"Content-Length"];

    

    // fire away

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    if (connection)

        self.responseData = [NSMutableData data];

    else

        NSLog(@"NSURLConnection initWithRequest: Failed to return a connection.");

    

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    [self.responseData setLength:0]; }

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    

    [self.responseData appendData:data];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    NSLog(@"connection didFailWithError: %@ %@", error.localizedDescription,

          [error.userInfo objectForKey:NSURLErrorFailingURLStringErrorKey]);

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    

    NSLog(@"DONE. Received Bytes:%d",[self.responseData length]);

    

    NSString *theXml = [[NSString alloc] initWithBytes:[self.responseData mutableBytes] length:[self.responseData length] encoding:NSUTF8StringEncoding];

    

    NSLog(@"The final result :%@",theXml);//Here you will get the result xml in string

}