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copied!<p>I think asmx webservices are SOAP webservices you should read my blog entry here - </p> <p><a href="http://www.makebetterthings.com/iphone/call-soap-web-service-from-iphone/" rel="nofollow">http://www.makebetterthings.com/iphone/call-soap-web-service-from-iphone/</a></p> <p>To call a SOAP service first i create a string with the SOAP request as follows.</p> <pre><code> NSString *soapMessage = @"<?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" "<CelsiusToFahrenheit xmlns="http://tempuri.org/">n" "<Celsius>50</Celsius>n" "</CelsiusToFahrenheit>n" "</soap:Body>n" "</soap:Envelope>n"; After creating the SOAP request I create a NSMutableRequest to send this request to server. NSURL *url = [NSURL URLWithString:@"http://w3schools.com/webservices/tempconvert.asmx"]; 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://tempuri.org/CelsiusToFahrenheit" forHTTPHeaderField:@"SOAPAction"]; [theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"]; [theRequest setHTTPMethod:@"POST"]; [theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]]; NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if( theConnection ) { webData = [[NSMutableData data] retain]; } else { NSLog(@"theConnection is NULL"); } </code></pre> <p>After firing the request we can collect the XML response in the NSURLConnection’s delegate methods.</p> <pre><code>-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [webData setLength: 0]; } -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [webData appendData:data]; } -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"ERROR with theConenction"); [connection release]; [webData release]; } -(void)connectionDidFinishLoading:(NSURLConnection *)connection { NSLog(@"DONE. Received Bytes: %d", [webData length]); NSString *theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding]; NSLog(@"%@",theXML); [theXML release]; } </code></pre> <p>After collecting the XML response in theXML string in -(void)connectionDidFinishLoading:(NSURLConnection *)connection we can parse this string using <a href="http://www.tbxml.co.uk/TBXML/TBXML_Free.html" rel="nofollow">TBXML</a> for any other XML parser you like.</p>

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