我正在尝试以下代码，肥皂网络服务。它不工作。
请帮帮我。
NSString *soapMessage = [NSString stringWithFormat:
@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<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/\">\n"
"<soap:Body>\n"
"<request xmlns=\"http://searchupc.com/GenerateBarcode\">\n"
"<auth>5ggpf54TRghbnIvqS2XVGQQ0q6qCNuJ</auth>\n"
"<method>FetchProductByUPC</method>"
"<params>"
"<upc>026274920257</upc>"
"</params>"
"</request>\n"
"</soap:Body>\n"
"</soap:Envelope>\n"
];
NSLog(soapMessage);
NSURL *url = [NSURL URLWithString:@"http://www.simpleupc.com/api/"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];
[theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[theRequest addValue: @"http://searchupc.com/GenerateBarcode/" forHTTPHeaderField:@"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPMethod:@"POST"];
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
NSLog(@"SOAP CONNECTED qqq%@",theRequest);
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];