Odtnhj

I am new to iPhone app development. How can I post data and get data by accessing the asmx web service using iPhone app?

I think asmx webservices are SOAP webservices you should read my blog entry here -

http://www.makebetterthings.com/iphone/call-soap-web-service-from-iphone/

To call a SOAP service first i create a string with the SOAP request as follows.

 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");

After firing the request we can collect the XML response in the NSURLConnection’s delegate methods.

-(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];

After collecting the XML response in theXML string in -(void)connectionDidFinishLoading:(NSURLConnection *)connection
we can parse this string using TBXML for any other XML parser you like.